<?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>0185-3309</journal-id>
<journal-title><![CDATA[Revista mexicana de fitopatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fitopatol]]></abbrev-journal-title>
<issn>0185-3309</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitopatología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-33092018000100035</article-id>
<article-id pub-id-type="doi">10.18781/r.mex.fit.1710-3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Bacterias endófitas de la raíz en líneas de maíces tolerantes y susceptibles a sequía]]></article-title>
<article-title xml:lang="en"><![CDATA[Root endophyte bacteria in drought-tolerant and drought-susceptible maize lines]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Bautista]]></surname>
<given-names><![CDATA[Alma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-García de Alba]]></surname>
<given-names><![CDATA[Carlos De]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aranda-Ocampo]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zavaleta-Mejía]]></surname>
<given-names><![CDATA[Emma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nava-Díaz]]></surname>
<given-names><![CDATA[Cristian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goodwin]]></surname>
<given-names><![CDATA[Paul H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leyva-Mir]]></surname>
<given-names><![CDATA[Santos G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de Mexico]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Guelph School of Environmental Sciences Department of Plant Pathology]]></institution>
<addr-line><![CDATA[Guelph Ontario]]></addr-line>
<country>Canada</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Chapingo Laboratorio de Parasitología Agrícola ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<fpage>35</fpage>
<lpage>55</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-33092018000100035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-33092018000100035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-33092018000100035&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El maíz (Zea mays) ocupa el segundo lugar como alimento en el mundo y la sequía limita su productividad. Las plantas albergan bacterias endófitas que influyen en la sanidad y tolerancia a la sequía. El objetivo de esta investigación fue estimar la densidad y diversidad de las bacterias endófitas cultivables de la raíz en siete líneas homocigóticas de maíces tolerantes y siete susceptibles a sequía en tres localidades de México durante tres ciclos del cultivo. La densidad y diversidad de las poblaciones bacterianas se evaluó mediante conteo directo en placas y se identificaron por PCR. Los resultados identificaron tres grupos de bacterias endófitas: 1) altamente frecuentes (Bacillus subtilis, Bacillus megaterium y Pseudomonas geniculata), 2) frecuentes (Bacillus firmus, Pseudomonas hibiscola y Sinorhizobium meliloti) y 3) baja frecuencia (Acinetobacter soli, Stenotrophomonas maltophila y Burkholderia gladioli. El análisis de varianza (ANOVA) mostró diferencias significativas (p&#8804;0,05) en la densidad (Log10 UFC g-1 de raíz) de población por localidad, ciclo de cultivo, días después de siembra y líneas de maíz. La densidad de Bacillus subtilis, Pseudomonas hibiscola en la localidad de El Batán y Bacillus megaterium, Sinorhizobium meliloti en Tlaltizapán, fueron significativamente mayores en las líneas de maíz tolerantes que en las susceptibles a sequía.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Maize (Zea mays) ranks second as food in the world and drought limits its productivity. Plants harbor endophytic bacteria that influence health and drought tolerance. The goal of this research was to estimate the density and diversity of cultivable endophyte bacteria from the root system of seven homozygous maize drought-tolerant and seven drought-susceptible lines in three locations of Mexico during three crop cycles. The density and diversity of bacterial populations was assessed by direct counting on plates and identified by PCR. The results identified three groups of endophytic bacteria: 1) highly frequent (Bacillus subtilis, Bacillus megaterium y Pseudomonas geniculata), 2) frequent (Bacillus firmus, Pseudomonas hibiscola y Sinorhizobium meliloti) y 3) low frequency (Acinetobacter soli, Stenotrophomonas maltophila y Burkholderia gladioli. The analysis of variance (ANOVA) showed significant differences (p&#8804;0.05) in density (Log10 CFU g-1 root) of population by location, crop cycle, days after sowing and maize lines. The density of Bacillus subtilis, Pseudomonas hibiscola at El Batán and Bacillus megaterium, Sinorhizobium meliloti in Tlaltizapán, were significantly higher in drought-tolerant maize lines compared to drought-susceptible lines.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays]]></kwd>
<kwd lng="es"><![CDATA[bacterias endofíticas]]></kwd>
<kwd lng="es"><![CDATA[diversidad bacteriana]]></kwd>
<kwd lng="es"><![CDATA[16S rADN]]></kwd>
<kwd lng="en"><![CDATA[Zea mays]]></kwd>
<kwd lng="en"><![CDATA[endophytic bacteria]]></kwd>
<kwd lng="en"><![CDATA[bacterial diversity]]></kwd>
<kwd lng="en"><![CDATA[16S rADN]]></kwd>
</kwd-group>
</article-meta>
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