<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212015000200267</article-id>
<article-id pub-id-type="doi">10.15517/am.v26i2.19281</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Identificación de Bacterias Endófitas Resistentes a Plomo, Aisladas de Plantas de Arroz]]></article-title>
<article-title xml:lang="en"><![CDATA[Identification of lead- resistant endophytic bacteria isolated from rice]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Cordero]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barraza-Roman]]></surname>
<given-names><![CDATA[Zafiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Pacheco]]></surname>
<given-names><![CDATA[Dalila]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sucre Facultad de Ciencias Agropecuarias Laboratorio de Investigaciones Microbiológicas]]></institution>
<addr-line><![CDATA[Sincelejo ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sucre Facultad de Ciencias Agropecuarias Laboratorio de Investigaciones Microbiológicas]]></institution>
<addr-line><![CDATA[Sincelejo ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Sucre Facultad de Ciencias Agropecuarias Laboratorio de Investigaciones Microbiológicas]]></institution>
<addr-line><![CDATA[Sincelejo ]]></addr-line>
<country>CO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>267</fpage>
<lpage>276</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212015000200267&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212015000200267&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212015000200267&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:El objetivo de este estudio fue evaluar in vitro la resistencia de bacterias endófitas a diferentes concentraciones de plomo. El muestreo se realizó en el primer semestre de 2013, durante el cual se colectaron muestras de tejidos de variedades comerciales de arroz en etapa de macollamiento cultivadas en el municipio de Montería, Córdoba, Colombia. Cada tejido fue sometido a proceso de desinfección superficial. Se aislaron bacterias endófitas en medio de cultivo agar R2A; a partir de cada tejido se determinó la densidad poblacional (UFC/g de tejido) por el método de conteo sobre la superficie de medio R2A; la separación de morfotipos se realizó mediante la forma, color, tamaño y apariencia. Un total de 168 morfotipos fueron aislados de raíz, macolla y hoja de diferentes variedades comerciales de arroz. La prueba de resistencia a plomo se realizó in vitro, para esto se prepararon suspensiones de bacterias en fase log, se inocularon en medio mínimo con cinco concentraciones de plomo en forma de Pb(NO3)2. El ensayo se llevó a incubación con agitación por 150 rpm, a 32 °C por cinco días. Cada hora después de iniciado el ensayo se realizó lectura de la turbidimetría a 600 nm. Las bacterias mostraron la capacidad de crecer a concentraciones de 100% de Pb en forma Pb(NO3)2. La identificación con el kit API20E confirmó la presencia de Burkholderia cepacia yPseudomonas putida, las cuales mostraron resistencia a diferentes concentraciones de plomo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:The objective of this study was to evaluate in vitro the endophytic bacteria resistance to different lead concentrations. The sampling was undertaken in the first half of 2013, when tissue samples of commercial varieties of rice at tillering stage were collected in Montería, Cordoba, Colombia. Each tissue was subjected to surface cleaning. Endophytic bacteria in agar R2A medium were isolated. Population density (CFU/g tissue) was determined from each tissue, by direct counting of R2A medium surface. morphotypes were classified by shape, color, size, and appearance. A total of 168 morphotypes were isolated from root, tillers, and leaf of different commercial varieties of rice. The lead resistance test was performedin vitro, to do that, suspensions of endophytic bacteria in log phase were prepared and inoculated in minimal medium with five concentrations of lead as Pb(NO3)2. The experiment was incubated at 32 °C and agitated at 150 rpm, for five days. Every hour afterstarting the test, turbidimetry measuring at 600 nm was conducted. Results showed the ability of endophytic bacteria to grow at concentrations of 100% of Pb as Pb(NO3)2. The results of the identification with kit API20E confirmed the presence of Burkholderia cepacia and Pseudomonas putida, which showed resistance to different lead concentrations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Oryza sativa]]></kwd>
<kwd lng="es"><![CDATA[microorganismos endófitos]]></kwd>
<kwd lng="es"><![CDATA[fitoremediación.]]></kwd>
<kwd lng="en"><![CDATA[Oryza sativa]]></kwd>
<kwd lng="en"><![CDATA[endophytic microorganisms]]></kwd>
<kwd lng="en"><![CDATA[phytoremediation.]]></kwd>
</kwd-group>
</article-meta>
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