<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242019000200061</article-id>
<article-id pub-id-type="doi">10.15517/rac.v43i2.37949</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Etiología de las pudriciones en el tallo DE Hylocereus costaricensis, Provocadas por Enterobacter hormaechei, en Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Etiology of stem rot on Hylocereus spp. cause by Enterobacter hormaechei in Costa Rica.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Retana-Sánchez]]></surname>
<given-names><![CDATA[Kenneth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Zúñiga]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Blanco-Meneses]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Quesada-González]]></surname>
<given-names><![CDATA[Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Estatal a Distancia Cátedra de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Facultad de Ciencias Agroalimentarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Facultad de Ciencias Agroalimentarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Tecnológico de Costa Rica Escuela de Química ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>43</volume>
<numero>2</numero>
<fpage>61</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242019000200061&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242019000200061&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242019000200061&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En el 2011 se realizó una investigación para identificar el agente causal de las pudri- ciones presentes en los tallos de Hylocereus costaricensis en Costa Rica. En época lluviosa, la sintomatología asociada a estas enfermedades correspondió a pequeñas pudriciones amarillen- tas que por lo general iniciaron del borde del cla- dodio y se extendieron hacia adentro del mismo, hasta que se descompuso todo el tallo. Durante la época seca, se observaron manchas circulares anaranjadas que posteriormente se tornaron de color marrón oscuro. Para determinar el agente causal se recolectaron 25 muestras de cada tipo de pudrición, cladodios completos con diferentes estados de desarrollo de los síntomas, a partir de las cuales se realizó 15 aislamientos de cada enfermedad. Se obtuvo una bacteria de forma consistente de cada sintomatología, con las cuales se realizó la identificación, caracterización basa- da en pruebas bioquímicas e identificación mole- cular, así como la verificación de los postulados de Koch. De acuerdo con los resultados de las pruebas realizadas, los síntomas fueron provoca- dos por una misma bacteria. Con base en el aná- lisis molecular, secuenciación de la región 16S, la bacteria presentó un 99,2% de similitud con Enterobacter hormaechei (KJ999997). Según los resultados de las pruebas de verificación de los postulados de Koch, se obtuvo un 100% de infección y una sintomatología similar a la obser- vada en campo, así como el mismo organismo inoculado. Este es el primer reporte de esta bac- teria como patógeno de los tallos de Hylocereus costaricensis en el continente americano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In 2011 infected samples were examined to identify the causal agent of stem rot of Hylocereus costaricensis in Costa Rica. During the rainy season, symptoms associated with the disease included a small yellowish rot that typically started from the edge of the cladodium and extended inward towards the stem. Eventually the whole stem decayed. During the dry season, orange circular spots appeared on the stem, turning dark brown. For determine the causal agent, were collected 25 samples of each type of decay, complete cladodes with different stages of symptom development, from which 15 isolations of each disease were made. A bacterium was obtained consistently from each symptomatology, with which the identification, characterization based on biochemical tests and molecular identification was carried out, as well as the verification of Koch&#8217;s postulates. Results indicated that the symptoms were caused by the same bacteria. Based on sequencing of the 16S region, the bacterium showed 99.2% similarity with Enterobacter hormaechei (KJ999997). According to Koch&#8217;s postulates, a similar symptomatology was obtained on plants from the field and on inoculated plants. This is the first report of this pathogen causing damage to the stem of Hylocereus costarricensis in American continent.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pudrición marrón]]></kwd>
<kwd lng="es"><![CDATA[Hylocereus costaricensis]]></kwd>
<kwd lng="es"><![CDATA[Enterobacter hormaechei]]></kwd>
<kwd lng="en"><![CDATA[Brown rot]]></kwd>
<kwd lng="en"><![CDATA[Hylocereus costaricensis]]></kwd>
<kwd lng="en"><![CDATA[Enterobacter hormaechei]]></kwd>
</kwd-group>
</article-meta>
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