<?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>S0185-33092024000200105</article-id>
<article-id pub-id-type="doi">10.18781/r.mex.fit.2310-2</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Detección y caracterización molecular de un fitoplasma del grupo 16SrII asociado a la enfermedad de &#8216;escoba de bruja&#8217; en cactus (Opuntia sp.)]]></article-title>
<article-title xml:lang="en"><![CDATA[Detection and molecular characterization of a 16SrII group phytoplasma associated with &#8216;witches broom&#8217; disease in cactus (Opuntia sp.)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Acosta]]></surname>
<given-names><![CDATA[Candelario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Martínez]]></surname>
<given-names><![CDATA[Reyna Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ochoa-Martínez]]></surname>
<given-names><![CDATA[Daniel L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva-Valenzuela]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-33092024000200105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-33092024000200105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-33092024000200105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivo/Antecedentes. Los fitoplasmas son patógenos obligados de plantas, tienen una fuerte especificidad con sus hospedantes, los síntomas típicos inducidos por estos patógenos incluyen reducción de crecimiento y declinamiento generalizado, entre otros, y rara vez ocasionan muerte de la planta. El objetivo de esta investigación fue determinar el fitoplasma asociado al síntoma de &#8216;escoba de bruja&#8217; en un cactus ornamental (Opuntia sp.).  Materiales y Métodos. En cuatro viveros comerciales en Texcoco, Estado de México, se tomaron cuatro muestras de cactus ornamental con síntomas de &#8216;escoba de bruja&#8217;. Se realizó extracción de ADN de las muestras y se sometieron a PCR con iniciadores específicos para fitoplasmas (P1/P7 y R16F2n/R16R2). La determinación del fitoplasma en estudio se realizó por PCR, RFLP in vitro, secuenciación y análisis filogenético.  Resultados. De acuerdo con los diferentes análisis que se realizaron, se determinó que el fitoplasma asociado al nopal ornamental pertenece al subgrupo 16SrII-C.  Conclusión. Con base en los resultados obtenidos, se establece que un fitoplasma del subgrupo16SrII-C está asociado con el síntoma de &#8216;escoba de bruja&#8217; del cactus ornamental (Opuntia sp.).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract   Objective/Background Phytoplasmas are obligate plant pathogens that exhibit strong specificity with their hosts. Typical symptoms induced by these pathogens include stunted growth and general decline, among others, and they rarely lead to plant death. The aim of this research was to determine the phytoplasma associated with the &#8216;witch&#8217;s broom&#8217; symptom in an ornamental cactus (Opuntia sp.).  Materials and Methods Four samples of ornamental cacti exhibiting &#8216;witch&#8217;s broom&#8217; symptoms were collected from four commercial nurseries in Texcoco, State of Mexico. DNA extraction was performed on the samples, followed by PCR using specific primers for phytoplasmas (P1/P7 and R16F2n/R16R2). Phytoplasma determination was carried out through PCR, in vitro RFLP, sequencing, and phylogenetic analysis.  Results According to the various analyses conducted, it was determined that the phytoplasma associated with the ornamental cactus belongs to the subgroup 16SrII-C.  Conclusion Based on the obtained results, it is established that a phytoplasma from the 16SrII-C subgroup is associated with the &#8216;witch&#8217;s broom&#8217; symptom in the ornamental cactus (Opuntia sp.).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[deformación]]></kwd>
<kwd lng="es"><![CDATA[patógenos no cultivables]]></kwd>
<kwd lng="es"><![CDATA[RFLP in vitro]]></kwd>
<kwd lng="en"><![CDATA[deformation]]></kwd>
<kwd lng="en"><![CDATA[uncultivable pathogens]]></kwd>
<kwd lng="en"><![CDATA[in vitro RFLP]]></kwd>
</kwd-group>
</article-meta>
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