<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952007000500555</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cambios anatómicos en raíces de cebada (Hordeum vulgare L.) inducidos por cactodera galinsogae]]></article-title>
<article-title xml:lang="en"><![CDATA[Anatomical changes on barley roots (Hordeum vulgare L.) induced by cactodera galinsogae]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tovar-Soto]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cid del Prado-Vera]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Margaret-Nicol]]></surname>
<given-names><![CDATA[Julie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Evans]]></surname>
<given-names><![CDATA[Kenneth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval-Islas]]></surname>
<given-names><![CDATA[José S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Garza]]></surname>
<given-names><![CDATA[Angel]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas-Soriano]]></surname>
<given-names><![CDATA[Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,IPN ENCB Departamento de Parasitología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,International Wheat and Maize Improvement Centre  ]]></institution>
<addr-line><![CDATA[Ankara ]]></addr-line>
<country>Turkey</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Rothamsted Research Nematode Interactions Unit ]]></institution>
<addr-line><![CDATA[Harpenden ]]></addr-line>
<country>United Kingdom</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<volume>41</volume>
<numero>5</numero>
<fpage>555</fpage>
<lpage>561</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952007000500555&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952007000500555&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952007000500555&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se describen las alteraciones anatómicas causadas por C. galinsogae en las raíces de cebada (Hordeum vulgare) cv. Esmeralda, recolectadas a 10, 20 y 40 d post-emergencia de las plantas, en Singuilucan, Hidalgo. Se trata de un patógeno descrito recientemente, del cual se desconocen las lesiones que induce en la hospedera.El examen histológico mostró a los 10 d juveniles (J2, J3) en el tejido cortical, observándose rompimiento de las células aledañas. A los 20 d, los juveniles (J3, J4) se encontraron próximos al cilindro vascular. Además se observó la inducción de primordios laterales cerca del nematodo. Los sitios de alimentación, pequeños e irregulares, abarcaron menos de 50% del cilindro vascular y el tejido cortical, con disolución de paredes celulares internas y engrosamiento de las celulares externas, y con desorganización, desplazamiento y rompimiento del xilema y floema. A 40 d, en los cortes transversales, los sincicios tuvieron mayor tamaño, abarcando de 50 a 60% del cilindro vascular. A nivel celular los cambios fueron similares a los observados a los 20 d, además de encontrarse abundante almidón. Las hembras maduras se observaron en la corteza rodeadas por una capa de felógeno y los machos aparecieron doblados en el mismo tejido.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The anatomical changes in barley (Hordeum vulgare L.) cv. Esmeralda roots caused by C. galinsogae, collected at 10, 20, and 40 days after plant emergence at Singuilucan, Hidalgo are described. It is a recently described pathogen, whose lessions induced on the host plant are unknown. The histological exam showed the 10-day-old juveniles (J2, J3) in the cortical tissue, breaking of neighbouring cells being observed. At 20 d, the juveniles (J3, J4) were found close to the vascular cylinder. Furthermore, the induction of lateral primordia near the nematode was observed. The feeding sites, small and irregular, covered less than 50% of the vascular cylinder and the cortical tissue, with dissolution of internal, and thickening of external cell walls and with disorganization, displacement, and breaking of xylem and phloem. At 40 d, in the cross sections, syncytia were larger, covering 50 to 60% of the vascular cylinder. At cell level, the changes were similar to those observed at 20 d, besides starch being present in abundance. Mature females were observed in the cortex, surrounded by a layer of cork cambium, and the males appeared bent in the same tissue.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Alteraciones anatómicas]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[nematodo formador de quistes]]></kwd>
<kwd lng="es"><![CDATA[poaceae]]></kwd>
<kwd lng="en"><![CDATA[Anatomical changes]]></kwd>
<kwd lng="en"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[cyst-forming nematode]]></kwd>
<kwd lng="en"><![CDATA[poaceae]]></kwd>
</kwd-group>
</article-meta>
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