<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682018000200193</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.46.12</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Alteraciones histológicas causadas por el nematodo agallador Meloidogyne incognita en raíces de betabel (Beta vulgaris L.).]]></article-title>
<article-title xml:lang="en"><![CDATA[Histological changes for root-knot nematode Meloidogyne incognita in beetroot roots (Beta vulgaris L.).]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina-Molina]]></surname>
<given-names><![CDATA[C.O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina-Canales]]></surname>
<given-names><![CDATA[M.G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Coronel]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvajal-Sandoval]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tovar-Soto]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Parasitología]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Botánica]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<numero>46</numero>
<fpage>193</fpage>
<lpage>202</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682018000200193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682018000200193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682018000200193&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En 2011 se efectuó una exploración nematológica a la zona agrícola del Valle de Tepeaca, municipio de Acatzingo en el estado de Puebla, México. En una parcela cultivada con betabel ubicada en la localidad de Santa María Actipa, municipio de Acatzingo se encontraron, en las raíces del cultivo, agallas prominentes. Se tomó una muestra (suelo + plantas) en dicha parcela, detectándose, en el laboratorio hembras de Meloidogyne en las raíces, se procedió a la identificación de la especie utilizando la prueba de fenotipos isoenzimáticos de esterasa (EST) y malato deshidrogenasa (MDH) y se estudiaron los patrones perineales de las hembras. Adicionalmente se evaluaron las alteraciones histológicas causadas por el nematodo en el interior de las raíces. Los fenotipos isoenzimático para EST y MDH fueron I1 y N2a, respectivamente, correspondientes a la especie Meloidogyne incognita y los patrones perineales de las hembras mostraron arco dorsal alto y cuadrado, sin líneas laterales claramente visibles, característicos de la misma especie. Por su parte, el estudio histológico mostró hiperplasia e hipertrofia celular que provocó la formación de cinco a siete células gigantes multinucleadas, con paredes celulares engrosadas y citoplasma denso y granuloso. También se observaron de cuatro a seis hembras piriformes por agalla, embebidas en el tejido parenquimatoso, con disposición cercana al cilindro vascular. La presencia de estas hembras provocó el desplazamiento de los vasos xilemáticos y lignificación de células aledañas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: In 2011, a nematological exploration was carried out in the agricultural area of &#8203;&#8203;the Tepeaca Valley, Municipality of Acatzingo, in the state of Puebla, where a plot planted with beet was found in the town of Santa María Actipa, municipality of Acatzingo, Puebla, Mexico, where a high percentage of the roots presented prominent galls. A sample (soil + plants) was taken, in the laboratory females of Meloidogyne was detected, the identification of the nematode was carried out by the isozyme phenotype test using the enzymes esterase (EST) and malate dehydrogenase (MDH) and confirmed by morphological characters of the female perineal models. Additionally, the histological alterations were evaluated. The results showed that the isoenzymatic phenotype for EST corresponded to type I1; while for the MDH it was the N2a phenotype both associated with the specie Meloidogyne incognita. Likewise, perineal females models showed a high and square dorsal arch, with no clearly visible lateral lines those are characteristics of this species. On the other hand, the histological study showed hyperplasia and cellular hypertrophy that caused the formation of five to seven multinucleated giant cells, with thickened cell walls and dense and granular cytoplasm. Four to six piriform females per gall, embedded in the parenchymal tissue, were also observed near the vascular cylinder. The presence of these females provoked the displacement of the xylem vessels and the lignification of neighboring cells.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Beta vulgaris]]></kwd>
<kwd lng="es"><![CDATA[células gigantes]]></kwd>
<kwd lng="es"><![CDATA[histología]]></kwd>
<kwd lng="es"><![CDATA[Meloidogyne incognita]]></kwd>
<kwd lng="es"><![CDATA[nematodo agallador]]></kwd>
<kwd lng="en"><![CDATA[Beta vulgaris]]></kwd>
<kwd lng="en"><![CDATA[Giant cells]]></kwd>
<kwd lng="en"><![CDATA[histology]]></kwd>
<kwd lng="en"><![CDATA[Meloidogyne incognita]]></kwd>
<kwd lng="en"><![CDATA[root-knot nematode]]></kwd>
</kwd-group>
</article-meta>
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