<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442013000400005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Crecimiento de Casuarina equisetifolia (Casuarinaceae) en suelo con diésel, y aplicación de bioestimulación y bioaumentación]]></article-title>
<article-title xml:lang="en"><![CDATA[Casuarina equisetifolia (Casuarinaceae) growth in soil with diesel and application of biostimulation and bioaugmentation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Martínez]]></surname>
<given-names><![CDATA[María Esther]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alarcón]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrera-Cerrato]]></surname>
<given-names><![CDATA[Ronald]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almaraz- Suarez]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Barradas]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo México]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Veracruzana  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<volume>61</volume>
<numero>3</numero>
<fpage>1039</fpage>
<lpage>1052</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442013000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442013000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442013000400005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Phytoremediation is an ecologically sound biotechnology directed to cleaning up contaminated soils. The study of tree species to treat petroleum contaminated soils is scarce; moreover, the combination of phytoremediation with bioaugmentation and biostimulation processes is also limited. Thus, this work evaluated the effects of the inoculation of Glomus intraradices, a bacterial consortium (M2BOS1-R2 and M2BOSI-F4) and Trichoderma viride, on the growth of Casuarina equisetifolia, fertilized with Floranid® or Triple 17, when sown in a diesel-contaminated soil (7 500mg/kg). The factorial experiment 2x5x3 included 30 treatments with 10 replicates in a completely randomized design under greenhouse conditions for 120 days. Diesel significantly diminished plant height, total biomass, and plant index quality (PIQ). Glomus or bacterial consortium significantly increased plant height, total biomass and PIQ when compared to the inoculation of the three microorganisms or to the control. Floranid had negative effects on plant growth and PIQ at diesel contamination. Fertilization with Triple 17 combined with the three microorganisms stimulated plant growth in the absence of diesel, whereas in the presence of this contaminant the treatments combining Triple 17 with the bacterial consortium or with Trichoderma had better plant growth and PIQ. Mycorrhizal colonization was inhibited due to diesel contamination, and especially when Floranid was applied. The fertilizer Triple 17 (biostimulation) combined with the beneficial microorganisms (bioaugmentation) improved growth responses of C. equisetifolia in diesel-contaminated soil.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La fitorremediación es una biotecnología ecológicamente racional que está dirigida a la limpieza de suelos contaminados; sin embargo, el estudio de especies arbóreas para la fitorremediación de suelos con hidrocarburos del petróleo es limitado. Más aún, la combinación de la fitorremediación con procesos de bioaumentación y bioestimulación es también limitada. Por lo anterior, este estudio evaluó el efecto de la inoculación de Glomus intraradices, un consorcio bacteriano (M2BOS1-R2 y M2BOSI-F4) y Trichoderma viride en el crecimiento de plantas de Casuarina equisetifolia L. fertilizadas con Floranid® o Triple 17, en suelo contaminado con diésel (7 500mg/kg). El experimento factorial 2x5x3 incluyó 30 tratamientos y 10 repeticiones, distribuidos completamente al azar en invernadero, durante 120 días. El diésel disminuyó significativamente la altura, la biomasa total y el índice de calidad (ICP) de planta. Glomus o las bacterias aumentaron significativamente la altura, la biomasa seca total y el ICP con respecto al tratamiento sin inocular o con la triple inoculación. El Floranid redujo el crecimiento vegetal y el ICP, en presencia de diésel. El Triple 17 combinado con los tres microorganismos produjo mayor crecimiento vegetal en ausencia de contaminación, pero en presencia de diésel, el Triple 17 combinado con bacterias o con Trichoderma, estimuló la biomasa seca total y el ICP. La colonización micorrízica fue inhibida por el diesel, especialmente con la fertilización del Floranid. El Triple 17 (bioestimulación) combinado con los microorganismos (bioaumentación), favoreció el crecimiento de Casuarina en suelo contaminado con diésel.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[inorganic fertilizers]]></kwd>
<kwd lng="en"><![CDATA[bacterial consortium]]></kwd>
<kwd lng="en"><![CDATA[Glomus]]></kwd>
<kwd lng="en"><![CDATA[Trichoderma]]></kwd>
<kwd lng="en"><![CDATA[phytotoxicity]]></kwd>
<kwd lng="es"><![CDATA[fertilizantes inorgánicos]]></kwd>
<kwd lng="es"><![CDATA[consorcio bacteriano]]></kwd>
<kwd lng="es"><![CDATA[Glomus]]></kwd>
<kwd lng="es"><![CDATA[Trichoderma]]></kwd>
<kwd lng="es"><![CDATA[fitotoxicidad]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div style="text-align: justify; font-family: verdana;">     <div style="text-align: center;"><font style="font-weight: bold;"  size="4">Crecimiento de </font><font size="4"><span  style="font-style: italic;">Casuarina equisetifolia</span></font><font style="font-weight: bold;" size="4"> (Casuarinaceae) en suelo con di&eacute;sel, y aplicaci&oacute;n de bioestimulaci&oacute;n y bioaumentaci&oacute;n    <br> </font><font size="4"><span style="font-style: italic;">    <br> Casuarina equisetifolia</span></font><font style="font-weight: bold;" size="4"> (Casuarinaceae) growth in soil with diesel and application of biostimulation and bioaugmentation</font><font size="2"><span  style="font-style: italic;"></span><span style="font-weight: bold;"> </span></font></div>     <br>     <div style="text-align: center;"><font size="2">Mar&iacute;a Esther D&iacute;az-Mart&iacute;nez<sup><a href="#1">1</a><a name="3"></a>*</sup>, Alejandro Alarc&oacute;n<a href="#1"><sup>1</sup></a>, Ronald Ferrera-Cerrato<a href="#1"><sup>1</sup></a>, Juan Jos&eacute; Almaraz- Suarez<a href="#1"><sup>1</sup></a> &amp; Oscar Garc&iacute;a-Barradas<sup><a href="#2">2</a><a name="4"></a>*</sup></font>    <br> </div> <font size="2">&nbsp;&nbsp;     <br> <a name="Correspondencia2"></a>*<a href="#Correspondencia1">Direcci&oacute;n para correspondencia:</a>    <br> </font><font size="2"></font> <hr style="width: 100%; height: 2px;"><font style="font-weight: bold;"  size="3">Abstract</font>    <br> <font size="2"></font>    ]]></body>
<body><![CDATA[<br> <font size="2"><span style="font-style: italic;"></span>Phytoremediation is an ecologically sound biotechnology directed to cleaning up contaminated soils. The study of tree species to treat petroleum contaminated soils is scarce; moreover, the combination of phytoremediation with bioaugmentation and biostimulation processes is also limited. Thus, this work evaluated the effects of the inoculation of <span style="font-style: italic;">Glomus intraradices</span>, a bacterial consortium (M2BOS1-R2 and M2BOSI-F4) and <span style="font-style: italic;">Trichoderma viride</span>, on the growth of <span style="font-style: italic;">Casuarina equisetifolia</span>, fertilized with Floranid&reg;&nbsp;&nbsp; or Triple 17,&nbsp; when sown in a diesel-contaminated soil (7 500mg/kg). The factorial experiment&nbsp; 2x5x3 included 30 treatments with 10 replicates in a completely randomized design under greenhouse conditions for 120 days. Diesel significantly diminished plant height, total biomass, and plant index quality (PIQ). Glomus or bacterial consortium significantly increased plant height, total biomass and PIQ when compared to the inoculation of the three microorganisms or to the control. Floranid had negative effects on plant growth and PIQ at diesel contamination. Fertilization with Triple 17 combined with the three microorganisms stimulated plant growth in the absence of diesel, whereas in the presence of this contaminant the treatments combining Triple 17 with the bacterial consortium or with <span  style="font-style: italic;">Trichoderma</span> had better plant growth and PIQ. Mycorrhizal colonization was inhibited due to diesel contamination, and especially when Floranid was applied. The fertilizer Triple 17 (biostimulation) combined with the beneficial microorganisms (bioaugmentation) improved growth responses of <span  style="font-style: italic;">C. equisetifolia</span> in diesel-contaminated soil. </font>    <br> <font size="2"></font>    <br> <font size="2"><span style="font-weight: bold;">Key words:</span> inorganic fertilizers, bacterial consortium, <span  style="font-style: italic;">Glomus</span>,<span  style="font-style: italic;"> Trichoderma</span>, phytotoxicity.</font>    <br> <font size="2"></font>    <br> <font size="2"></font><font style="font-weight: bold;" size="3">Resumen</font>    <br> <font size="2"></font>    <br> <font size="2">La&nbsp; fitorremediaci&oacute;n&nbsp; es&nbsp; una&nbsp;&nbsp; biotecnolog&iacute;a&nbsp; ecol&oacute;gicamente&nbsp; racional&nbsp; que&nbsp; est&aacute;&nbsp; dirigida&nbsp; a&nbsp; la&nbsp; limpieza&nbsp; de suelos contaminados; sin embargo, el estudio de especies arb&oacute;reas para la fitorremediaci&oacute;n de suelos con hidrocarburos del petr&oacute;leo es&nbsp; limitado. M&aacute;s a&uacute;n, la combinaci&oacute;n de&nbsp; la&nbsp; fitorremediaci&oacute;n con procesos de&nbsp; bioaumentaci&oacute;n y&nbsp; bioestimulaci&oacute;n&nbsp; es&nbsp; tambi&eacute;n&nbsp; limitada.&nbsp; Por&nbsp; lo&nbsp; anterior, este estudio evalu&oacute; el efecto de la inoculaci&oacute;n de Glomus intraradices,&nbsp; un&nbsp; consorcio&nbsp;&nbsp; bacteriano&nbsp; (M2BOS1-R2&nbsp; y M2BOSI-F4)&nbsp; y&nbsp;&nbsp; <span style="font-style: italic;">Trichoderma&nbsp; viride</span>&nbsp; en&nbsp; el&nbsp; crecimiento de&nbsp; plantas de <span  style="font-style: italic;">Casuarina equisetifolia</span> L.&nbsp; fertilizadas con Floranid&reg;&nbsp;&nbsp; o Triple 17, en suelo contaminado con di&eacute;sel (7 500mg/kg). El experimento factorial 2x5x3 incluy&oacute; 30 tratamientos y 10 repeticiones, distribuidos completamente al azar en invernadero, durante 120 d&iacute;as. El di&eacute;sel disminuy&oacute; significativamente la altura, la biomasa total y el &iacute;ndice de calidad (ICP) de planta. Glomus o las bacterias aumentaron significativamente la altura, la biomasa seca total y el ICP con respecto al tratamiento sin&nbsp; inocular o con la triple inoculaci&oacute;n. El Floranid redujo el crecimiento vegetal y el ICP, en presencia de di&eacute;sel. El Triple 17 combinado con los tres microorganismos&nbsp; produjo mayor crecimiento vegetal en ausencia de contaminaci&oacute;n, pero en presencia de di&eacute;sel, el Triple 17 combinado con bacterias o con <span style="font-style: italic;">Trichoderma</span>, estimul&oacute; la&nbsp; biomasa seca total y el ICP. La colonizaci&oacute;n micorr&iacute;zica fue inhibida por el diesel,&nbsp; especialmente con la fertilizaci&oacute;n del Floranid. El Triple 17 (bioestimulaci&oacute;n) combinado&nbsp; con&nbsp; los&nbsp; microorganismos&nbsp; (bioaumentaci&oacute;n), favoreci&oacute;&nbsp; el crecimiento de Casuarina en suelo&nbsp; contaminado con di&eacute;sel.</font>    <br> <font size="2"></font>    <br> <font size="2"><span style="font-weight: bold;">Palabras clave:</span> fertilizantes inorg&aacute;nicos, consorcio bacteriano, <span style="font-style: italic;">Glomus, Trichoderma</span>, fitotoxicidad.</font><font size="2"> </font>    <br> <hr style="width: 100%; height: 2px;"><font size="2">El petr&oacute;leo es una mezcla de hidrocarburos que representa una de las principales actividades industriales de M&eacute;xico (Primo 1996, Pardo <span style="font-style: italic;">et al.</span> 2004), destacando la producci&oacute;n de diesel con 337 millones de barriles diarios (PEMEX 2010). A pesar de su importancia econ&oacute;mica y social, la industria petrolera colateralmente genera problemas de contaminaci&oacute;n del suelo causados principalmente por la falta de mantenimiento de instalaciones petroleras, explosiones de alto riesgo en instalaciones y fugas en las l&iacute;neas de conducci&oacute;n (Jim&eacute;nez 2002).</font>    ]]></body>
<body><![CDATA[<br> <font size="2"></font>    <br> <font size="2">Una vez depositados en el suelo, los hidrocarburos del petr&oacute;leo se acumulan y forman una capa hidrof&oacute;bica, induciendo la fragmentaci&oacute;n de los agregados; de igual manera, causan la reducci&oacute;n&nbsp; y&nbsp; la&nbsp; inhibici&oacute;n&nbsp; de&nbsp; la&nbsp; cobertura vegetal, y modifican las poblaciones microbianas del ambiente ed&aacute;fico (L&oacute;pez-Mart&iacute;nez <span style="font-style: italic;">et al.</span> 2005, Adams &amp; Morales-Garc&iacute;a 2008).</font>    <br> <font size="2"></font>    <br> <font size="2">Las t&eacute;cnicas de remediaci&oacute;n de suelos contaminados representan un conjunto de operaciones que alteran la composici&oacute;n del contaminante a trav&eacute;s de acciones qu&iacute;micas, f&iacute;sicas o biol&oacute;gicas (Harrison 1999). La biorremediaci&oacute;n muestra ventajas con respecto a los m&eacute;todos f&iacute;sicos y qu&iacute;micos debido a su bajo costo (Volke &amp; Velasco 2002), y se centra en explotar la diversidad gen&eacute;tica y versatilidad metab&oacute;lica de los microorganismos, para transformar contaminantes e integrarlos a los ciclos biogeoqu&iacute;micos naturales (Garbisu <span  style="font-style: italic;">et al.</span> 2002).</font>    <br> <font size="2"></font>    <br> <font size="2">La biorremediaci&oacute;n mediante t&eacute;cnicas in situ se desarrolla satisfactoriamente con la aplicaci&oacute;n de bioestimulaci&oacute;n y de bioaumentaci&oacute;n (Castillo <span  style="font-style: italic;">et al.</span> 2005). La bioestimulaci&oacute;n modifica las condiciones del suelo al facilitar la proliferaci&oacute;n y la actividad de los microorganismos nativos a trav&eacute;s de la adici&oacute;n de nutrientes, aceptores de electrones, surfactantes, o bien, ox&iacute;geno al suelo (Castillo <span style="font-style: italic;">et al.</span> 2005, Singh <span  style="font-style: italic;">et al.</span> 2011). As&iacute;, la aplicaci&oacute;n de fertilizantes org&aacute;nicos e inorg&aacute;nicos favorece la&nbsp; degradaci&oacute;n&nbsp; de&nbsp; hidrocarburos&nbsp; de&nbsp; petr&oacute;leo en suelos (Pardo <span style="font-style: italic;">et al.</span> 2004). Como ejemplo, la fertilizaci&oacute;n con N-P-K (15-15-15) en suelo contaminado con petr&oacute;leo fue factor importante en la bioestimulaci&oacute;n de la actividad microbiana y en el crecimiento de las plantas, favoreciendo con ello la degradaci&oacute;n de petr&oacute;leo crudo (55%), en comparaci&oacute;n con el suelo sin la fertilizaci&oacute;n (29%) (Ubochi <span style="font-style: italic;">et al.</span> 2006).</font>    <br> <font size="2"></font>    <br> <font size="2">La bioaumentaci&oacute;n por su parte, consiste en adicionar microorganismos al&oacute;ctonos o modificados gen&eacute;ticamente con capacidad de degradar contaminantes org&aacute;nicos (Volke &amp; Velasco 2002, Castillo <span style="font-style: italic;">et al.</span> 2005). Este m&eacute;todo se utiliza en suelos contaminados cuando la microflora aut&oacute;ctona es insuficiente en n&uacute;mero o en su capacidad degradadora de compuestos org&aacute;nicos t&oacute;xicos (Gentry <span  style="font-style: italic;">et al.</span> 2004, Mancera <span style="font-style: italic;">et al.</span> 2008).</font>    <br> <font size="2"></font>    <br> <font size="2">Los hongos micorr&iacute;zicos arbusculares (HMA), las bacterias y los hongos filamentosos tienen uso potencial en la fitorremediaci&oacute;n de suelos contaminados con hidrocarburos de petr&oacute;leo (Boonchan <span style="font-style: italic;">et al.</span> 2000, Leyval <span  style="font-style: italic;">et al.</span> 2001, Kirk <span  style="font-style: italic;">et al.</span> 2005, Hughes <span  style="font-style: italic;">et al.</span> 2007, Silva <span style="font-style: italic;">et al.</span> 2009). Los HMA pueden estabilizar hidrocarburos polic&iacute;clicos arom&aacute;ticos (Kirk <span  style="font-style: italic;">et al.</span> 2005) o bien, aumentar actividades enzim&aacute;ticas en las plantas (peroxidasa, oxidasa o </font><font size="2">catecol oxidasa) cuando se encuentran sometidas a ciertas concentraciones de petr&oacute;leo (Liu <span  style="font-style: italic;">et al.</span> 2004). En gram&iacute;neas, los HMA inducen la resistencia a estr&eacute;s por di&eacute;sel y antraceno (Debiane <span style="font-style: italic;">et al.</span> 2008, Tang <span style="font-style: italic;">et al.</span> 2009), mientras que en leguminosas estos hongos estimulan su crecimiento (Liu <span style="font-style: italic;">et al.</span> 2004, Cheung <span  style="font-style: italic;">et al.</span> 2008, Hern&aacute;ndez-Ortega <span style="font-style: italic;">et al.</span> 2012).</font>    ]]></body>
<body><![CDATA[<br> <font size="2"></font>    <br> <font size="2">Las&nbsp; bacterias&nbsp; de&nbsp; vida&nbsp; libre&nbsp; como&nbsp; <span style="font-style: italic;">Bacillus cereus, B. sphaericus, B. fusiformis, B. pumilus, Acinetobacter junii, Pseudomonas </span>sp.<span  style="font-style: italic;">, y P. putida toleran</span> y degradan tolueno y xileno (Bento <span style="font-style: italic;">et al.</span> 2005, Purushothaman <span style="font-style: italic;">et al.</span> </font><font  size="2">2010). Algunos g&eacute;neros bacterianos utilizados con &eacute;xito en procesos de bioaumentaci&oacute;n son <span  style="font-style: italic;">Flavobacterium, Sphingomonas, Alcaligenes, Rhodococcus, Mycobacterium, Sinorhizobium, Paracoccus&nbsp; </span>y<span style="font-style: italic;">&nbsp; Achromobacter</span>&nbsp; (Singh&nbsp; <span  style="font-style: italic;">et&nbsp; al.</span> </font><font size="2">2003, El Fantroussi &amp; Agathos 2005, Keum <span  style="font-style: italic;">et al.</span> 2006, Teng <span  style="font-style: italic;">et al.</span> 2010).</font>    <br> <font size="2"></font>    <br> <font size="2">En el caso de hongos filamentosos, <span  style="font-style: italic;">Rhizopus</span> sp., <span  style="font-style: italic;">Penicillium funiculosum </span>y<span style="font-style: italic;"> Aspergillus sydowii</span> son capaces de remover hidrocarburos totales de petr&oacute;leo, hidrocarburos polic&iacute;clicos arom&aacute;ticos e hidrocarburos alif&aacute;ticos (Mancera <span  style="font-style: italic;">et al.</span> 2008).Otros hongos usados en la bioaumentaci&oacute;n son <span  style="font-style: italic;">Absidia, Achremonium, Aspergillus, Verticillium, Penicillium, Fusarium,&nbsp; Mucor&nbsp; </span>y<span style="font-style: italic;">&nbsp; Trichoderma&nbsp;</span> (Hughes&nbsp; <span  style="font-style: italic;">et&nbsp; al.</span> 2007, Argumedo-Delira <span style="font-style: italic;">et al.</span> 2009, Silva <span style="font-style: italic;">et al.</span> 2009, Mrozik &amp; Piotrowska-Seget 2010).</font>    <br> <font size="2"></font>    <br> <font size="2">Diversas plantas herb&aacute;ceas estimulan la proliferaci&oacute;n de microorganismos en su rizosfera&nbsp; en&nbsp; presencia&nbsp; de&nbsp; contaminantes&nbsp; org&aacute;nicos (Singh <span  style="font-style: italic;">et al.</span> 2004). Algunas especies arb&oacute;reas se han utilizado en la fitorremediaci&oacute;n o dendroremediaci&oacute;n (Schoenmuth &amp; Pestemer 2004, Tamas &amp; Gullner 2006). A manera&nbsp; de&nbsp; contraste,&nbsp; algunas&nbsp; especies&nbsp; arb&oacute;reas como <span style="font-style: italic;">Cupressus arizonica</span> var. Arizonica, <span style="font-style: italic;">Populus&nbsp; deltoides</span>&nbsp; Bartram&nbsp; ex&nbsp; Marsh.,&nbsp;<span style="font-style: italic;"> Acacia nilotica</span> (L.) Willd. ex Delile, <span  style="font-style: italic;">A. implexa</span> Benth., <span  style="font-style: italic;">A. longifolia</span> Wild., <span style="font-style: italic;">Eucalyptus camaldulensis</span> Dehnh., <span style="font-style: italic;">E. melliodora</span> A.Cunn. ex Schauer., <span style="font-style: italic;">Angophora </span>&#64258;oribunda (Smith) Sweet. y <span style="font-style: italic;">Casuarina cunninghamiana</span> Miq., han sido exitosamente utilizadas para remediar suelos contaminados con metales pesados (Aitchison <span  style="font-style: italic;">et al.</span> 2000, Shanker <span  style="font-style: italic;">et al.</span> 2005, Alcal&aacute; <span style="font-style: italic;">et al.</span> 2008, Farias <span style="font-style: italic;">et al.</span> 2009, Singh <span style="font-style: italic;">et al.</span> 2010). Sin embargo, el uso de especies arb&oacute;reas para limpiar suelos contaminados con compuestos org&aacute;nicos es a&uacute;n limitado. Por ejemplo, <span style="font-style: italic;">Pinus sylvestris L. </span>y<span style="font-style: italic;"> P. deltoides</span>, favorecen la disipaci&oacute;n de di&eacute;sel (Palmroth <span  style="font-style: italic;">et al.</span> 2002), mientras que <span style="font-style: italic;">Salix</span> (Clon EW-20) y Picea abies (L.) Karst., acumulan 80% de trinitrotolueno (TNT) (Schoenmuth &amp; Pestemer 2004), y <span  style="font-style: italic;">Casuarina equisetifolia</span> L. tolera de 5 a 10g/kg de di&eacute;sel en suelos salinos (Sun <span style="font-style: italic;">et al.</span> 2004). Esta &uacute;ltima especie&nbsp; arb&oacute;rea&nbsp; de&nbsp; origen Australiano&nbsp; se&nbsp; ha adaptado con &eacute;xito en M&eacute;xico y su uso se ha dirigido a la reforestaci&oacute;n rural y urbana (Vald&eacute;s <span  style="font-style: italic;">et al.</span> 2004), o bien como barreras rompe viento, para controlar la erosi&oacute;n de costas y dunas, y para restaurar zonas con problemas de salinidad (Ndiaye <span  style="font-style: italic;">et al.</span> 1993, Moezel <span style="font-style: italic;">et al.</span> 1989, Bruz&oacute;n <span style="font-style: italic;">et al.</span> 2003, CONABIO 2009, Zhong <span style="font-style: italic;">et al.</span> 2010).</font>    <br> <font size="2"></font>    <br> <font size="2">Desde el punto de vista ambiental, Casuarina ha mostrado 100% de supervivencia con respecto a otras especies forestales, en sitios contaminados por la industria minera, y tiene la capacidad de acumular Cromo (CrIII) en sus ra&iacute;ces (Shanker <span  style="font-style: italic;">et al.</span> 2005). En lo que respecta a contaminantes org&aacute;nicos solo se ha reportado un trabajo en suelo salino contaminado con di&eacute;sel (Sun <span  style="font-style: italic;">et al.</span> 2004). Por lo anterior, este trabajo evalu&oacute; la respuesta de <span style="font-style: italic;">Casuarina equisetifolia</span> a la bioestimulaci&oacute;n con dos fertilizantes inorg&aacute;nicos y a la bioaumentaci&oacute;n con un HMA, <span style="font-style: italic;">Trichoderma viride</span> y un consorcio bacteriano, en un suelo contaminado con di&eacute;sel.</font>    <br> <font size="2"></font>    <br> <font style="font-weight: bold;" size="3">Materiales y M&eacute;todos</font>    ]]></body>
<body><![CDATA[<br> <font size="2"></font>    <br> <font size="2"><span style="font-weight: bold;">Recolecta de semilla:</span> La semilla de <span style="font-style: italic;">Casuarina equisetifolia</span> L. fue recolectada en el Colegio de Postgraduados Campus Montecillo y colocada en bolsas de papel para su secado a temperatura ambiente. Las semillas fueron desinfectadas con hipoclorito de sodio (10%) y despu&eacute;s lavadas con suficiente agua destilada para eliminar el exceso del desinfectante. La semilla fue germinada en macetas con 250g de arena de r&iacute;o lavada y est&eacute;ril, durante un mes. Las pl&aacute;ntulas seleccionadas para su trasplante presentaron una altura de 2.5cm en promedio.</font>    <br> <font size="2"></font><br style="font-weight: bold;"> <font size="2"><span style="font-weight: bold;">Recolecta del suelo: </span>El suelo (10kg) fue recolectado en San Diego municipio de Texcoco, Estado de M&eacute;xico, a partir de los 20cm superficiales, al cual se determinaron sus caracter&iacute;sticas f&iacute;sicas y qu&iacute;micas con m&eacute;todos normalizados en el laboratorio de Fertilidad de Suelos (Colegio de Postgraduados). El suelo present&oacute; un pH de 7.2, 0.14% de N, 2.8% de materia org&aacute;nica y textura franco arenosa. El suelo fue tamizado y esterilizado en autoclave a 121&deg;C por 4h por dos d&iacute;as consecutivos, y posteriormente secado a 100&deg;C por 48h; seguidamente fue contaminado con di&eacute;sel comercial.</font>    <br> <font size="2"></font>    <br> <font size="2"><span style="font-weight: bold;">Contaminaci&oacute;n del suelo:</span> 2kg de suelo seco est&eacute;ril fueron colocados en refractario de vidrio (3kg de capacidad), al cual se le agreg&oacute; el di&eacute;sel correspondiente para obtener una concentraci&oacute;n de 7 500mg/kg. El di&eacute;sel fue disuelto en 150mL de acetona (Fermont&reg;) en vaso de precipitados (500mL) para facilitar su impregnaci&oacute;n homog&eacute;nea en el suelo (Alarc&oacute;n <span style="font-style: italic;">et al.</span> 2008). Una vez contaminado, el suelo fue dejado en reposo en condiciones de campana de extracci&oacute;n, durante cinco d&iacute;as.</font>    <br> <font size="2"></font><br style="font-weight: bold;"> <font size="2"><span style="font-weight: bold;">Preparaci&oacute;n de los inoculantes microbianos:</span> El in&oacute;culo de <span style="font-style: italic;">Glomus intraradices</span> fue preparado con fragmentos de ra&iacute;ces (1cm) de <span style="font-style: italic;">Plectranthus coleoides</span> Benth (Fam. Lamiaceae) utilizada como planta trampa crecida en arena de r&iacute;o, como sustrato. La colonizaci&oacute;n micorr&iacute;zica radical determinada mediante la t&eacute;cnica de Phillips &amp; Hayman (1970) fue de 65%, y el n&uacute;mero de esporas cuantificado por el m&eacute;todo de Gerdemann &amp; Nicolson (1963) fue de 900esporas/g.</font>    <br> <font size="2"></font>    <br> <font size="2">El in&oacute;culo de <span style="font-style: italic;">Trichoderma viride</span> (CP4) fue propagado en cajas de Petri con Agar Papa Dextrosa (PDA; Merck<sup>&reg;</sup>) dos semanas antes del establecimiento del experimento. Las cajas de Petri fueron incubadas a 28&deg;C, y posteriormente colocadas a temperatura ambiente para favorecer la esporulaci&oacute;n del hongo. Las esporas fueron recuperadas en 350mL de agua destilada est&eacute;ril, lavadas y filtradas con fibra de&nbsp; vidrio,&nbsp; bajo&nbsp; condiciones&nbsp; de&nbsp; campana&nbsp; de flujo laminar. El filtrado fue recuperado en matraz Erlenmeyer previamente esterilizado y la concentraci&oacute;n de esporas fue cuantificada en c&aacute;mara de Neubauer; cada planta fue inoculada con 3mL de la suspensi&oacute;n de esporas (5.36 x 10<sup>8</sup>esporas/mL).    <br>     <br> </font><font size="2">El in&oacute;culo bacteriano estuvo conformado por dos cepas; la cepa M2BOS1-R2 identificada como <span style="font-style: italic;">Sphingobacterium</span> sp., correspondiente a cocobacilos Gram negativos con actividad hidrocarbonoclasta; y la cepa M2BOS4-F2 (bacteria esf&eacute;rica solubilizadora de fosfato inorg&aacute;nico, en proceso de identificaci&oacute;n), compuesta por bacilos Gram negativos, tolerantes a di&eacute;sel y productores de biosurfactantes. Las bacterias&nbsp; fueron&nbsp; propagadas&nbsp; individualmente&nbsp; en&nbsp; frascos&nbsp; de&nbsp; vidrio&nbsp; con&nbsp; 35mL de&nbsp; caldo nutritivo con cinco repeticiones. Los frascos fueron&nbsp; incubados&nbsp; en&nbsp; agitaci&oacute;n&nbsp; a&nbsp; 180rpm&nbsp; a 28&deg;C durante 72h. Posteriormente, las soluciones bacterianas fueron colocadas en tubos de 50mL y centrifugadas a 7 500rpm por 10min. El sobrenadante fue decantado y la pastilla bacteriana fue recuperada con 35mL de agua destilada est&eacute;ril. Cada bacteria fue concentrada en un matraz Erlenmeyer de 500mL est&eacute;ril. El conteo de las unidades formadoras de&nbsp; colonias&nbsp; (UFC)&nbsp; fue&nbsp; estimado&nbsp; a&nbsp; partir&nbsp; de 1mL de la suspensi&oacute;n bacteriana del cual se hicieron&nbsp; diluciones&nbsp; decimales&nbsp; (10<sup>-1 </sup>a 10<sup>-7</sup>). Posteriormente, se tom&oacute; 0.1mL de las diluciones 10<sup>-4</sup>, 10<sup>-5</sup>, 10<sup>-6</sup>&nbsp; y 10<sup>-7</sup>, y colocado en cajas de Petri con agar nutritivo con tres repeticiones por diluci&oacute;n. Inmediatamente las&nbsp; cajas fueron incubadas a 28&deg;C por 48h, y&nbsp; despu&eacute;s de este tiempo fueron cuantificadas las UFC. La carga bacteriana obtenida para la cepa M2BOS1-R2 fue de 6x10<sup>8</sup>UFC/mL y para M2BOS4-F2 fue de 2.5x10<sup>8</sup>UFC/mL.&nbsp; Finalmente, cada unidad experimental fue inoculada con 3mL de la suspensi&oacute;n bacteriana final.</font>    ]]></body>
<body><![CDATA[<br> <font size="2"></font><br style="font-weight: bold;"> <font size="2"><span style="font-weight: bold;">Fertilizantes inorg&aacute;nicos utilizados:</span> Los fertilizantes utilizados en el experimento fueron Triple 17 y Floranid<sup>&reg;</sup>. El fertilizante granulado Triple 17(N-P-K) fue aplicado de acuerdo con la dosis de fertilizaci&oacute;n para especies arb&oacute;reas (Finck 1988), al suministrar 0.035g a cada unidad experimental. El Floranid (fertilizante inorg&aacute;nico microgranulado de lenta liberaci&oacute;n y contenido de N-P-K de 16-7-15), fue aplicado a cada unidad experimental al suministrar 0.62g, de acuerdo a la dosis especificada por el fabricante para especies arb&oacute;reas.</font>    <br> <font size="2"></font>    <br> <font size="2"><span style="font-weight: bold;">Establecimiento del experimento:</span> El experimento fue establecido bajo condiciones de invernadero con temperaturas m&aacute;ximas y m&iacute;nimas promedio de 24&deg;C y 13&deg;C, respectivamente, y con humedad relativa m&aacute;xima y m&iacute;nima promedio de 83% y 30%, respectivamente (Data logger Hobo serie H8)</font>    <br> <font size="2"></font>    <br> <font size="2">El suelo con di&eacute;sel y sin diesel fue colocado en tubos de pl&aacute;stico para uso en forester&iacute;a con 126g de capacidad, a los cuales se aplic&oacute; el fertilizante correspondiente en las dosis mencionadas, homogeneiz&aacute;ndolo con el suelo. Una pl&aacute;ntula de <span style="font-style: italic;">C. equisetifolia</span> de un mes de edad fue trasplantada en cada tubo (10 tubos por tratamiento) y tambi&eacute;n inoculada con<span  style="font-style: italic;"> G. intraradices</span>, con la suspensi&oacute;n bacteriana (M2BOS1-R2 y M2BOS4-F4), o con <span style="font-style: italic;">T. viride</span>, seg&uacute;n el tratamiento correspondiente. Las pl&aacute;ntulas se mantuvieron en condiciones de invernadero. El riego de las pl&aacute;ntulas fue aplicado con 30mL de agua destilada est&eacute;ril diariamente durante 120 d&iacute;as.</font>    <br> <font size="2"></font>    <br> <font size="2">Despu&eacute;s de 120 d&iacute;as se midi&oacute; la altura, y las plantas fueron cosechadas para estimar la biomasa seca total (70&deg;C por 48h) y el &iacute;ndice de calidad de planta (ICP) producida en vivero basado&nbsp; en&nbsp; caracteres&nbsp; morfol&oacute;gicos&nbsp; (Dickson <span style="font-style: italic;">et al.</span>&nbsp; 1960)&nbsp; mediante&nbsp; la&nbsp; siguiente&nbsp; ecuaci&oacute;n: IC ={[Peso seco total de la planta (g)]/[Altura (cm)/di&aacute;metro de tallo]+[peso seco parte a&eacute;rea (g)/Peso seco ra&iacute;z (g)]}. Adem&aacute;s, la colonizaci&oacute;n micorr&iacute;zica de las plantas inoculadas con <span  style="font-style: italic;">G. intraradices</span> fue determinada mediante la t&eacute;cnica de Phillips &amp; Hayman (1970), y fue expresada en porcentaje.</font>    <br> <font size="2"></font>    <br> <font size="2">El&nbsp; experimento&nbsp; tuvo&nbsp; un&nbsp; dise&ntilde;o&nbsp; factorial 2x5x3,&nbsp; con&nbsp; dos&nbsp; niveles&nbsp; de&nbsp; contaminaci&oacute;n (con&nbsp; di&eacute;sel&nbsp; y&nbsp; sin&nbsp; di&eacute;sel),&nbsp; cinco&nbsp; niveles&nbsp; de inoculaci&oacute;n (Testigo, <span style="font-style: italic;">G. intraradices</span>, consorcio bacteriano, <span style="font-style: italic;">Trichoderma</span>, y la combinaci&oacute;n de&nbsp; los&nbsp; tres&nbsp; microorganismos),&nbsp; y&nbsp; tres&nbsp; niveles de fertilizaci&oacute;n (Sin fertilizante, Triple 17, y Floranid). En total se tuvieron 30 tratamientos con 10 repeticiones cada uno. Los datos obtenidos para cada variable fueron sometidos a un an&aacute;lisis de varianza y prueba de comparaci&oacute;n de medias (LSD, &#945;=0.05) mediante el programa estad&iacute;stico SAS (SAS Institute 2000), y la estimaci&oacute;n del error est&aacute;ndar para cada media de cada tratamiento.</font>    <br> <font size="2"></font>    ]]></body>
<body><![CDATA[<br> <font style="font-weight: bold;" size="3">Resultados</font>    <br> <font size="2"></font>    <br> <font size="2">El <a href="/img/revistas/rbt/v61n3/a05t1.gif">cuadro 1</a> presenta los valores de significancia obtenidos para los tres factores independientes y sus combinaciones, en la altura, la biomasa seca total y el ICP, y se destaca el efecto significativo de la contaminaci&oacute;n por di&eacute;sel y de la interacci&oacute;n de los tres factores.    <br>     <br> </font><font size="2">En cuanto al an&aacute;lisis de los factores independientes, se observ&oacute; que la contaminaci&oacute;n con di&eacute;sel redujo significativamente (p&#8804;0.001) la altura de planta (40%) y la biomasa seca total 52%, aunque no produjo diferencias significativas en el &iacute;ndice de calidad de planta. El factor inoculaci&oacute;n mostr&oacute; diferencias significativas (p&lt;0.05), donde la inoculaci&oacute;n de <span style="font-style: italic;">Glomus intraradices</span>&nbsp; estimul&oacute;&nbsp; la&nbsp; biomasa&nbsp; seca&nbsp; total (80%) y el ICP (30%) con respecto al resto de los microorganismos inoculados. En contraste, el factor fertilizaci&oacute;n solo produjo diferencias significativas (p&#8804;0.01) para el ICP, el cual disminuy&oacute; significativamente (&gt;70%) con la fertilizaci&oacute;n con Floranid en comparaci&oacute;n con los tratamientos sin fertilizar o con Triple 17.</font>    <br> <font size="2"></font>    <br> <font size="2">En cuanto al efecto por tratamientos, se observaron diferencias significativas para (p&#8804;0.001) la altura, la biomasa seca total y el ICP. En ausencia de di&eacute;sel, la inoculaci&oacute;n de los tres microorganismos combinada con Triple 17 produjo la mayor altura (24.8cm), mientras que el menor valor (&lt;1cm) en general, fue obtenido en los tratamientos inoculados con aplicaci&oacute;n de Floranid (<a href="/img/revistas/rbt/v61n3/a05i1.jpg">Fig. 1a</a>). En contraste, en el suelo contaminado, la mayor altura se present&oacute; en el tratamiento sin inoculaci&oacute;n fertilizado con Triple 17 (17.7cm), y la menor altura en todos los tratamientos fertilizados con Floranid (<a  href="/img/revistas/rbt/v61n3/a05i1.jpg">Fig. 1b</a>).</font>    <br> <font size="2"></font>    <br> <font size="2">En cuanto a la biomasa seca total, en ausencia de di&eacute;sel, <span style="font-style: italic;">G. intraradices</span> con Floranid produjo la mayor biomasa (0.39g), mientras que&nbsp; el&nbsp; menor&nbsp; valor&nbsp; (0.17g)&nbsp; se&nbsp; present&oacute;&nbsp; con la inoculaci&oacute;n de <span  style="font-style: italic;">Trichoderma</span> sin fertilizar; aunque en tres de los tratamientos inoculados con aplicaci&oacute;n de Floranid no se obtuvo acumulaci&oacute;n de biomasa en las plantas (&lt;0.01g) (<a  href="/img/revistas/rbt/v61n3/a05i2.jpg">Fig. 2a</a>). En el suelo contaminado, la mayor biomasa se obtuvo con <span style="font-style: italic;">Trichoderma</span> en combinaci&oacute;n con Triple 17 (0.19g), y la menor biomasa se present&oacute; con la inoculaci&oacute;n de los tres microorganismos con Triple 17 (0.06g); no obstante, en los tratamientos con Floranid no se observ&oacute; acumulaci&oacute;n de biomasa (<a  href="/img/revistas/rbt/v61n3/a05i2.jpg">Fig. 2b</a>).    <br>     ]]></body>
<body><![CDATA[<br> </font><font size="2">En ausencia de di&eacute;sel, el mayor ICP se obtuvo con <span style="font-style: italic;">G. intraradices</span> combinado con Floranid (0.0045), y el menor valor se present&oacute; con la triple inoculaci&oacute;n con aplicaci&oacute;n de Floranid (0.0012); aunque en el resto de los tratamientos con fertilizaci&oacute;n de Floranid, el ICP fue cero (<a  href="/img/revistas/rbt/v61n3/a05i3.jpg">Fig. 3a</a>). En el suelo con di&eacute;sel, el mayor ICP se present&oacute; con la inoculaci&oacute;n del consorcio bacteriano con Triple 17 (0.0032), y el menor &iacute;ndice se present&oacute; con la triple inoculaci&oacute;n fertilizado con Triple 17 (0.0010); en contraste, en todos tratamientos fertilizados con Floranid, el valor del ICP fue cero (<a href="/img/revistas/rbt/v61n3/a05i3.jpg">Fig. 3b</a>).    <br>     <br> </font><font size="2">La colonizaci&oacute;n micorr&iacute;zica total present&oacute; diferencias significativas por efecto de los factores inoculaci&oacute;n y fertilizaci&oacute;n (p&#8804;0.001); mientras que el factor contaminaci&oacute;n no mostr&oacute; diferencias significativas. Para el factor inoculaci&oacute;n, la colonizaci&oacute;n micorr&iacute;zica fue mayor en&nbsp; el&nbsp; tratamiento&nbsp; con&nbsp; Glomus&nbsp; con&nbsp; respecto al tratamiento con la triple inoculaci&oacute;n. Para el factor fertilizaci&oacute;n, la mayor colonizaci&oacute;n se obtuvo en el tratamiento sin fertilizar en comparaci&oacute;n con la fertilizaci&oacute;n con Triple 17, aunque con la aplicaci&oacute;n de Floranid la colonizaci&oacute;n micorr&iacute;zica fue muy baja. La colonizaci&oacute;n micorr&iacute;zica total en los tratamientos donde se inocul&oacute; <span style="font-style: italic;">G. intraradices</span> (sin fertilizar y con Triple 17) fue menor al 2%, y no se observ&oacute; colonizaci&oacute;n micorr&iacute;zica en los tratamientos donde no se inocul&oacute; el hongo (<a href="/img/revistas/rbt/v61n3/a05i4.jpg">Fig. 4</a>). En ausencia de di&eacute;sel (<a href="/img/revistas/rbt/v61n3/a05i4.jpg">Fig. 4a</a>), la mayor colonizaci&oacute;n se present&oacute; en el tratamiento con <span  style="font-style: italic;">Glomus</span> y Floranid (0.75%), y la menor colonizaci&oacute;n en el tratamiento con la triple inoculaci&oacute;n fertilizado con Floranid (0.37%). En presencia de di&eacute;sel, la fertilizaci&oacute;n con Floranid inhibi&oacute; significativamente la colonizaci&oacute;n micorr&iacute;zica, y la mayor colonizaci&oacute;n se present&oacute; en el tratamiento sin fertilizar (1.0%) (<a  href="/img/revistas/rbt/v61n3/a05i4.jpg">Fig. 4b</a>).</font>    <br> <font size="2"></font>    <br> <font style="font-weight: bold;" size="3">Discusi&oacute;n</font>    <br> <font size="2"></font>    <br> <font size="2">La aplicaci&oacute;n de diesel (7 500mg/kg) redujo significativamente la altura de plantas de <span style="font-style: italic;">C. equisetifolia</span> y la acumulaci&oacute;n de biomasa seca. Los hidrocarburos del petr&oacute;leo t&iacute;picamente tienen efectos negativos en las plantas al reducir su crecimiento, su longitud radical, su biomasa, y en algunos casos provoca su muerte (Pezeshki <span style="font-style: italic;">et al.</span> 2000, Hutchinson <span style="font-style: italic;">et al.</span> 2001, Lin <span  style="font-style: italic;">et al.</span> 2002, Reynoso-Cuevas <span style="font-style: italic;">et al.</span> 2008).</font>    <br> <font size="2"></font>    <br> <font size="2">La fertilizaci&oacute;n con Triple 17 aument&oacute; la altura, la biomasa seca total y el ICP de plantas, mientras que la aplicaci&oacute;n de Floranid redujo significativamente dichas variables, especialmente en presencia del di&eacute;sel. La aplicaci&oacute;n de fertilizantes en suelos contaminados permite a la planta tolerar el trasplante en este suelo y el estr&eacute;s generado por el contaminante, adem&aacute;s de favorecer su crecimiento y acumulaci&oacute;n de biomasa (Menendez-Vega <span  style="font-style: italic;">et al.</span> 2007, Lin &amp; Mendelssohn 2009). No obstante, el presente trabajo muestra que es necesario definir dosis y tipos de fertilizantes que pueden ser aplicados para ciertas condiciones de suelo y contaminaci&oacute;n. La aplicaci&oacute;n de nitr&oacute;geno por medio de fertilizantes inorg&aacute;nicos en altas concentraciones para las pl&aacute;ntulas pueden provocar efectos nocivos (Bento <span  style="font-style: italic;">et al.</span> 2005). Lo anterior puede explicar en parte, el efecto negativo del Floranid en las plantas, ya que este fertilizante tiene alto contenido de sales de nitrato de amonio cuyo aumento en la soluci&oacute;n del suelo provoca reducciones en el potencial osm&oacute;tico e inhibe la actividad microbiana (Walworth <span style="font-style: italic;">et al.</span> 2007). As&iacute; como el exceso de nitr&oacute;geno puede afectar a las plantas, otros nutrimentos como f&oacute;sforo, potasio y azufre pueden retrasar el desarrollo vegetal&nbsp; y&nbsp; da&ntilde;ar&nbsp; gravemente&nbsp; las&nbsp; ra&iacute;ces,&nbsp; los tallos y las ramas (Thompson &amp; Troeh 2002). La fertilizaci&oacute;n en suelos contaminados con hidrocarburos del petr&oacute;leo debe ser dosificada considerando&nbsp; las&nbsp; condiciones&nbsp; ambientales&nbsp; y la concentraci&oacute;n del contaminante en el suelo (Chaineau <span style="font-style: italic;">et al.</span> 2005).</font>    <br> <font size="2"></font>    ]]></body>
<body><![CDATA[<br> <font size="2">La inoculaci&oacute;n de los tres microorganismos&nbsp; o&nbsp; de&nbsp; <span style="font-style: italic;">G.&nbsp; intraradices&nbsp;</span> estimul&oacute;&nbsp; la&nbsp; altura y el ICP de planta. Los efectos ben&eacute;ficos de los&nbsp; HMA han&nbsp; sido&nbsp; demostrados&nbsp; en&nbsp; diversas plantas,&nbsp; al&nbsp; estimular&nbsp; su&nbsp; altura&nbsp; y&nbsp; su&nbsp; biomasa seca en presencia de di&eacute;sel (Tang <span  style="font-style: italic;">et al.</span> 2009, Hern&aacute;ndez-Ortega <span style="font-style: italic;">et al.</span> 2012). Por su parte, la capacidad de <span style="font-style: italic;">Trichoderma</span> para estimular el crecimiento vegetal ha sido reportado principalmente en <span style="font-style: italic;">Lactuca sativa</span> L., <span style="font-style: italic;">Lycopersicon esculentum</span> Mill., y <span style="font-style: italic;">Zea mays</span> L., al conferir tolerancia a condiciones de estr&eacute;s (Ousley <span style="font-style: italic;">et al.</span> 1994, B&ouml;rkman <span style="font-style: italic;">et al.</span> 1998, Gravel <span style="font-style: italic;">et al.</span> 2007). Sin embargo, el efecto de <span style="font-style: italic;">Trichoderma</span> en pl&aacute;ntulas establecidas en suelo contaminado con hidrocarburos del petr&oacute;leo no ha sido estudiado previamente, aun cuando las cepas de este hongo presentan tolerancia hacia diversos hidrocarburos del petr&oacute;leo (Silva <span  style="font-style: italic;">et al.</span> 2009, Argumedo-Delira <span style="font-style: italic;">et al.</span> 2012).</font>    <br> <font size="2"></font>    <br> <font size="2">Los efectos ben&eacute;ficos de los tres microorganismos (bacterias hidrocarbonoclastas, <span style="font-style: italic;">Glomus</span> y <span style="font-style: italic;">Trichoderma</span>) en el crecimiento de las plantas no han sido evaluados previamente. En ausencia de di&eacute;sel, <span style="font-style: italic;">G. intraradices</span> y la adici&oacute;n de Triple 17 o Floranid, incrementaron la altura, la biomasa seca a&eacute;rea y de ra&iacute;z, y el ICP. Los microorganismos en el suelo desempe&ntilde;an diferentes funciones como el reciclaje de nutrientes y la promoci&oacute;n del crecimiento vegetal (Tang <span  style="font-style: italic;">et al.</span> 2010). Algunos autores mencionan que en condiciones naturales la capacidad de los &aacute;rboles para obtener nutrimentos est&aacute; mediada por la simbiosis con HMA (Finck 1988). Por ejemplo, <span  style="font-style: italic;">G. intraradices</span> aumenta la altura y la acumulaci&oacute;n de biomasa de <span  style="font-style: italic;">Casuarina</span>, y por tanto, favorece mayor crecimiento en vivero y sobrevivencia en campo (Vald&eacute;s <span style="font-style: italic;">et al.</span> 2004); sin embargo, no se tienen reportes de los efectos de los HMA en esta especie arb&oacute;rea bajo condiciones de contaminaci&oacute;n con hidrocarburos del petr&oacute;leo.</font>    <br> <font size="2"></font>    <br> <font size="2">Por otra parte, el ICP de Dickson indica la potencialidad de una pl&aacute;ntula para sobrevivir y crecer en ciertas condiciones; as&iacute;, pl&aacute;ntulas con mayor calidad tienen &iacute;ndices de calidad m&aacute;s altos (Paris <span style="font-style: italic;">et al.</span> 2011). Los bajos valores del ICP obtenidos en este trabajo son comparables con aquellos reportados para pl&aacute;ntulas de <span style="font-style: italic;">Quercus silex</span> (0.072 y 0.015), y que se atribuyeron a la baja calidad de los prop&aacute;gulos de donde se obtuvieron dichas pl&aacute;ntulas (Paris <span style="font-style: italic;">et al.</span> 2011). Lo anterior sugiere que bajo nuestras condiciones de estudio y el tiempo en el cual se hizo la evaluaci&oacute;n (120 d&iacute;as), las plantas a&uacute;n se encontraban en periodo de crecimiento activo, por lo que se sugiere llevar a cabo estudios a largo plazo. No obstante, la presencia&nbsp; del di&eacute;sel redujo el crecimiento de las plantas y en consecuencia, afect&oacute; la calidad de las mismas; sin embargo, la inoculaci&oacute;n de las bacterias hidrocarbonoclastas con Triple 17, mejor&oacute; el ICP en presencia de di&eacute;sel.</font>    <br> <font size="2"></font>    <br> <font size="2">El uso de cultivos mixtos de bacterias ha sido usado para maximizar la biodegradaci&oacute;n de contaminantes org&aacute;nicos (Rambeloarisoa <span style="font-style: italic;">et al.</span> 1984, Hii <span  style="font-style: italic;">et al.</span> 2009), ya que &eacute;stos favorecen la actividad enzim&aacute;tica que contribuye con&nbsp; </font><font  size="2"></font><font size="2">la resistencia de las plantas al estr&eacute;s provocado por el contaminante (Liu <span style="font-style: italic;">et al.</span> 2004, Debiane <span style="font-style: italic;">et al.</span> 2008, Tang <span style="font-style: italic;">et al.</span> 2009). En el caso particular de <span style="font-style: italic;">Sphingobacterium</span> (cepa M2BOS1R2), de acuerdo con la literatura, esta bacteria tiene la capacidad de usar los hidrocarburos del petr&oacute;leo como fuente de carbono (Dalal <span  style="font-style: italic;">et al.</span> 2010), a la vez de degradar colorantes como el Rojo 5 (Tamboli <span  style="font-style: italic;">et al.</span> 2010). Dada la nula investigaci&oacute;n sobre la interacci&oacute;n de bacterias hidrocarbonoclastas, HMA, y Trichoderma, este trabajo es de los primeros reportes que denotan los beneficios de estas interacciones microbianas en las respuestas de crecimiento de <span  style="font-style: italic;">Casuarina</span> en suelo contaminado con di&eacute;sel.</font>    <br> <font size="2"></font>    <br> <font size="2">En cuanto a la bioestimulaci&oacute;n, la fertilizaci&oacute;n con Triple 17 en <span style="font-style: italic;">C. equisetifolia</span> inoculada con <span style="font-style: italic;">Trichoderma</span>, con el consorcio bacteriano o con los tres microorganismos favoreci&oacute; el crecimiento (mayor acumulaci&oacute;n de biomasa e ICP) de las plantas en presencia de di&eacute;sel. Al respecto, el uso de consorcios microbianos en gram&iacute;neas ha conferido mayor tolerancia hacia los hidrocarburos del petr&oacute;leo (Tang <span  style="font-style: italic;">et al.</span> 2010), mientras que las plantas favorecen la actividad microbiana en presencia de contaminantes a trav&eacute;s de la liberaci&oacute;n de exudados de la ra&iacute;z (Schnoor <span style="font-style: italic;">et al.</span> 1995). Lo anterior denota la importancia de aplicar fuentes de nutrientes para las plantas que estimulen no s&oacute;lo su crecimiento sino tambi&eacute;n la actividad microbiana de la rizosfera bajo condiciones de contaminaci&oacute;n. No obstante, es trascendental seleccionar la fuente de fertilizaci&oacute;n que se piensa aplicar, ya que &eacute;sta puede afectar el crecimiento vegetal en condiciones de contaminaci&oacute;n. Por ejemplo, el Floranid tuvo efectos negativos en el crecimiento vegetal,&nbsp; particularmente&nbsp; en&nbsp; presencia de contaminante. Lo anterior sugiere usar dosis menores a la utilizada en este experimento, o bien usar diferentes fuentes de fertilizantes de lenta liberaci&oacute;n.</font>    <br> <font size="2"></font>    ]]></body>
<body><![CDATA[<br> <font size="2">El di&eacute;sel afect&oacute; la colonizaci&oacute;n de <span style="font-style: italic;">G. intraradices</span> en las ra&iacute;ces de las plantas hasta en 100%, concordando con los efectos negativos de los hidrocarburos en esta simbiosis (Verdin <span style="font-style: italic;">et al.</span> 2006, Hern&aacute;ndez-Ortega <span style="font-style: italic;">et al.</span>, 2012). Sin embargo, la respuesta de los HMA ante contaminantes org&aacute;nicos depende en muchos casos de la especie de HMA y del tipo de hidrocarburo al que est&eacute;n expuestos (Volante <span  style="font-style: italic;">et al.</span> 2005, Alarc&oacute;n <span style="font-style: italic;">et al.</span> 2006).</font>    <br> <font size="2"></font>    <br> <font size="2">A manera de conclusi&oacute;n, la bioestimulaci&oacute;n y la bioaumentaci&oacute;n proporcionaron mayor tolerancia y acumulaci&oacute;n de biomasa seca, e ICP de <span  style="font-style: italic;">C. equisetifolia </span>en presencia de di&eacute;sel. La bioestimulaci&oacute;n debe ser cuidadosamente seleccionada con base en las fuentes fertilizantes, ya que el Floranid produjo efectos negativos en el crecimiento vegetal, mientras que el Triple 17 produjo efectos sin&eacute;rgicos con los microorganismos inoculados, en el crecimiento de <span  style="font-style: italic;">C. equisetifolia</span> en el suelo contaminado con di&eacute;sel.</font>    <br> <font size="2"></font><br style="font-weight: bold;"> <font style="font-weight: bold;" size="3">Agradecimientos</font>    <br> <font size="2"></font>    <br> <font size="2">Trabajo financiado por el proyecto SEPCONACYT 79456; Mar&iacute;a Esther D&iacute;az-Mart&iacute;nez agradece el apoyo del CONACYT durante sus estudios de postgrado.</font>    <br> <hr style="width: 100%; height: 2px;"><font style="font-weight: bold;"  size="3">Referencias</font>    <br>     <br>     <!-- ref --><div style="text-align: left;"><font size="2">Adams,&nbsp; R.H. &amp; F. Morales-Garc&iacute;a. 2008.&nbsp; Concentraci&oacute;n residual de hidrocarburos&nbsp; en el suelo del tr&oacute;pico I: Consideraciones para la salud p&uacute;blica y protecci&oacute;n al ganado. Interciencia 37: 476-482.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1650941&pid=S0034-7744201300040000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font>    <br>     <!-- ref --><br> <font size="2">Aitchison, E.W., S.L. Kelley, J.P. Alvarez &amp; J.L. Schnoor. 2000.&nbsp; Phytoremediation&nbsp; of&nbsp; 1,4-dioxane&nbsp; by&nbsp; hybrid poplar trees. Water Environ. Res.72: 313-321.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1650944&pid=S0034-7744201300040000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font>    <br>     <!-- ref --><br> <font size="2">Alarc&oacute;n,&nbsp; A.,&nbsp; F.T.&nbsp; Davies&nbsp; Jr.,&nbsp; R.L.&nbsp; Autenrieth&nbsp; &amp;&nbsp; D.A. Zuberer.&nbsp; 2008.&nbsp; Arbuscular&nbsp; mycorrhiza&nbsp; and&nbsp; petroleum-degrading&nbsp;&nbsp; microorganisms enhanced phytoremediaton of petroleum-contaminated&nbsp; soil.&nbsp; Int.&nbsp; J. Phytorem. 10: 251-263.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1650947&pid=S0034-7744201300040000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font>    <br>     <!-- ref --><br> <font size="2">Alarc&oacute;n,&nbsp; A., J. Delgadillo-Mart&iacute;nez, A.&nbsp; Franco-Ram&iacute;rez, F.T. Davies Jr. &amp; R. Ferrera-Cerrato. 2006. Influence&nbsp; of&nbsp;&nbsp; two&nbsp;&nbsp; polycyclic&nbsp; aromatic&nbsp; hydrocarbons&nbsp;&nbsp; on spore&nbsp; germination,&nbsp; and&nbsp; phytoremediation&nbsp; potential of&nbsp; <span style="font-style: italic;">Gigaspora&nbsp;&nbsp; margarita-Echynochloa polystachya</span> symbiosis in benzo(a)pyrene-polluted substrate. Rev. Int. Contam. Amb. 22: 39-47.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1650950&pid=S0034-7744201300040000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font>    ]]></body>
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<body><![CDATA[<br> <a name="Correspondencia1"></a><a href="#Correspondencia2">*</a>Correspondencia a:    <br> </font><font size="2">Mar&iacute;a Esther D&iacute;az-Mart&iacute;nez. </font><font  size="2">&Aacute;rea de Microbiolog&iacute;a, Postgrado en Edafolog&iacute;a. Colegio de Postgraduados. Carretera&nbsp; M&eacute;xico-Texcoco km 36.5. Montecillo 56230, Estado de M&eacute;xico, M&eacute;xico; marite_21_3@hotmail.com</font>    <br> <font size="2">Alejandro Alarc&oacute;n. </font><font size="2">&Aacute;rea de Microbiolog&iacute;a, Postgrado en Edafolog&iacute;a. Colegio de Postgraduados. Carretera&nbsp; M&eacute;xico-Texcoco km 36.5. Montecillo 56230, Estado de M&eacute;xico, M&eacute;xico; aalarconcp@gmail.com. </font><font size="2">Correspondencia: aalarconcp@gmail.com</font>    <br> <font size="2">Ronald Ferrera-Cerrato. </font><font size="2">&Aacute;rea de Microbiolog&iacute;a, Postgrado en Edafolog&iacute;a. Colegio de Postgraduados. Carretera&nbsp; M&eacute;xico-Texcoco km 36.5. Montecillo 56230, Estado de M&eacute;xico, M&eacute;xico; rferreracerrato@gmail.com</font>    <br> <font size="2">Juan Jos&eacute; Almaraz- Suarez. </font><font size="2">&Aacute;rea de Microbiolog&iacute;a, Postgrado en Edafolog&iacute;a. Colegio de Postgraduados. Carretera&nbsp; M&eacute;xico-Texcoco km 36.5. Montecillo 56230, Estado de M&eacute;xico, M&eacute;xico;&nbsp; jalmaraz@hotmail.com</font>    <br> <font size="2">Oscar Garc&iacute;a-Barradas. </font><font size="2">Unidad de Servicios de Apoyo en Resoluci&oacute;n Anal&iacute;tica (SARA). Universidad Veracruzana. Dr. Luis Castelazo Ayala s/n. Col. Industrial Animas. Xalapa 91190, Veracruz, M&eacute;xico; osgarcia@uv.mx    <br> </font><font size="2"><a name="1"></a><a href="#3">1</a>. &Aacute;rea de Microbiolog&iacute;a, Postgrado en Edafolog&iacute;a. Colegio de Postgraduados. Carretera&nbsp; M&eacute;xico-Texcoco km 36.5. Montecillo 56230, Estado de M&eacute;xico, M&eacute;xico; marite_21_3@hotmail.com, aalarconcp@gmail.com, rferreracerrato@gmail.com, jalmaraz@hotmail.com. Correspondencia: aalarconcp@gmail.com</font>    <br> <font size="2"><a name="2"></a><a href="#4">2</a>.&nbsp; Unidad de Servicios de Apoyo en Resoluci&oacute;n Anal&iacute;tica (SARA). Universidad Veracruzana. Dr. Luis Castelazo Ayala s/n. Col. Industrial Animas. Xalapa 91190, Veracruz, M&eacute;xico; osgarcia@uv.mx</font>    <br> <hr style="width: 100%; height: 2px;">     <div style="text-align: center; font-weight: bold;"><font size="2">Recibido 08-V-2012.&nbsp;&nbsp; &nbsp;Corregido 10-XII-2012.&nbsp;&nbsp; &nbsp;Aceptado 22-I-2013</font></div> </div>     ]]></body>
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