<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802024000400385</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2024.4.385</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[&#8216;Candidatus Phytoplasma asteris&#8217; (16SrI) and Dalbulus maidis associated with white leave symptoms in maize]]></article-title>
<article-title xml:lang="es"><![CDATA[&#8216;Candidatus Phytoplasma asteris&#8217; (16SrI) y Dalbulus maidis asociados con síntomas de hoja blanca en maíz]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reveles-Torres]]></surname>
<given-names><![CDATA[Luis Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salas-Muñoz]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salas-Luévano]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salazar-Badillo]]></surname>
<given-names><![CDATA[Fátima Berenice]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mauricio-Castillo]]></surname>
<given-names><![CDATA[Jorge Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Rosales Zacatecas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Calera de Víctor Rosales Zacatecas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Zacatecas Unidad Académica de Agronomía ]]></institution>
<addr-line><![CDATA[Zacatecas Zacatecas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,UAZ Unidad Académica de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[Zacatecas Zacatecas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>47</volume>
<numero>4</numero>
<fpage>385</fpage>
<lpage>390</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802024000400385&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802024000400385&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802024000400385&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Maize (Zea mays L.) has become the most economically important crop worldwide. This cereal belongs to the Poaceae family, is native to Mexico and used for human and livestock consumption. In Mexico, its importance goes far beyond the economy, its influence at a social and cultural level has been reflected in the vestiges of ancient civilizations such as that established by the Mayans, for whom maize had a religious meaning; however, some biotic factors such as bacteria, viruses, fungi and phytoplasmas may limit the production of the various varieties of maize grown in Mexican territory. During the 2021 crop cycle, maize plants were collected from commercial plots in the municipality of Valparaiso, Zacatecas, Mexico, which presented a symptomatology related to the presence of phytoplasmas (dwarfism, color changes in leaves from green to white, general decline and death); in addition, asymptomatic maize plants were sampled as a control, and insects of the species Dalbulus maidis were sampled as well. Samples were analyzed by nested polymerase chain reaction (PCR) using the universal oligonucleotides combination P1/Tint, followed by the pair of oligonucleotides R16F2n/R16R2 resulting in sequences of the 16S rDNA gene from phytoplasmas. Phylogenetic and virtual RFLP analyses of the 16S rDNA sequences obtained from the analyzed samples showed 100 % sequence identity to each other and 99.7 % sequence identity with the homologous gene of Candidatus Phytoplasma asteris (GenBank accession KMM30790). The incidence of this new disease was 15 % in the sampled crops. These results relate Dalbulus maidis and Candidatus Phytoplasma asteris as a possible vector and causal agent, respectively, of a new symptomatology in maize.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El maíz (Zea mays L.) se ha constituido como el cultivo de mayor importancia económica a nivel mundial; esté cereal perteneciente a la familia Poaceae, es originario de México y utilizado tanto para consumo humano como ganadero. En México, su importancia va mucho mas allá de lo económico, su influencia a nivel social y cultural se ha visto plasmada en los vestigios de civilizaciones antiguas como la establecida por los mayas, para quienes el maíz tenía un significado religioso; sin embargo, algunos factores bióticos como bacterias, virus, hongos y fitoplasmas pueden limitar la producción de las diversas variedades de maíz cultivadas en territorio mexicano. Durante el ciclo de cultivo 2021, se colectaron plantas de maíz presentes en parcelas comerciales en el municipio de Valparaiso, Zacatecas, México las cuales presentaban una sintomatología relacionada con la presencia de fitoplasmas (enanismo, cambios de color en hojas de verde a blanco, declive general y muerte); además, se muestrearon plantas de maiz asintomáticas como testigos e insectos de la especie Dalbulus maidis. Las muestras se analizaron mediante la reacción en cadena de la polimerasa (PCR) anidada utilizando la combinación de oligonucleótidos universales P1/Tint, seguida por el par de oligonucleótidos R16F2n/R16R2 con lo que se logró obtener secuencias del gen 16S rDNA de fitoplasmas. Los análisis filogenético y RFLP virtual de las secuencias de 16S rDNA obtenidas a partir de las muestras analizadas mostraron una identidad de secuencia del 100% entre sí y una identidad de secuencia del 99.7 % con el gen homólogo de Candidatus Phytoplasma asteris (accesión del GenBank M30790). La incidencia de esta nueva enfermedad fue del 15 % en los cultivos muestreados. Estos resultados relacionan a Dalbulus maidis y a Candidatus Phytoplasma asteris como pobible vector y agente causal de una nueva sintomatología en maiz.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dalbulus maidis]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[molecular diagnostics]]></kwd>
<kwd lng="en"><![CDATA[nested PCR]]></kwd>
<kwd lng="en"><![CDATA[phytoplasma]]></kwd>
<kwd lng="es"><![CDATA[Dalbulus maidis]]></kwd>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[diagnóstico molecular]]></kwd>
<kwd lng="es"><![CDATA[fitoplasma]]></kwd>
<kwd lng="es"><![CDATA[PCR anidada]]></kwd>
</kwd-group>
</article-meta>
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