<?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>S0187-73802025000100077</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2025.1.77</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Latencia morfofisiológica en semillas de Taxus globosa Schltdl]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphophysiological dormancy in Taxus globosa Schltdl seeds]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avalos-Molina]]></surname>
<given-names><![CDATA[Perla Azucena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robledo-Paz]]></surname>
<given-names><![CDATA[Alejandrina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Sánchez]]></surname>
<given-names><![CDATA[Susana Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina-Moreno]]></surname>
<given-names><![CDATA[Juan Celestino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Tepatitlán de Morelos Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>48</volume>
<numero>1</numero>
<fpage>77</fpage>
<lpage>84</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802025000100077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802025000100077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802025000100077&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Taxus globosa es una especie que se encuentra restringida en el mundo y se incluye en la categoría de protección especial, sus semillas germinan uno o dos años después de haber sido dispersadas, por lo que se consideran latentes. El objetivo de la presente investigación fue determinar los cambios morfológicos y fisiológicos en las semillas de T. globosa expuestas a distintos tratamientos para romper la latencia. Las semillas se sometieron a tres tratamientos: escarificación con N2 líquido (Tratamiento 1), escarificación, aplicación de ácido giberélico (AG4/7), estratificación fría alternada con estratificación cálida y estratificación fría (Tratamiento 2), y doble escarificación con N2 líquido, intercalada con estratificación cálida y AG4/7 (Tratamiento 3). No se observaron semillas germinadas en ninguno de los tratamientos probados. En el Tratamiento 1 hubo crecimiento del embrión y 3.8 % de las semillas rompieron su testa a los 90 días. Después de 120 días de la aplicación de los tratamientos fue posible detectar en la testa trans-zeatina (0.008-0.009 µg mg-1), cis-zeatina (0.029 µg mg-1) y ácido abscísico (ABA) (0.0002-0.0023 µg mg-1). En el megagametofito se encontró cinetina (0.011 µg mg-1), transzeatina (0.008-0.011 µg mg-1) y ácido indolacético (AIA) (0.009 µg mg-1). Las hormonas citocininas (trans-zeatina, cis-zeatina, cinetina) y auxinas (AIA) estuvieron presentes en mayor concentración tanto en las semillas testigo como en las de los tratamientos. No se detectaron giberelinas en ninguno de los tratamientos. En la testa de las semillas tratadas se encontró floretina, ácido p-hidroxibenzoico (ACH), catequina, naringenina y ácido protocateuico, mientras que en el megagametofito estuvieron presentes el ácido sinápico, ACH, así como catequina, los cuales se consideran inhibidores de la germinación. Las semillas de T. globosa presentan latencia morfofisiológica causada por la inmadurez del embrión y la presencia de inhibidores de la germinación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Taxus globosa is a species that is restricted in the world and is included in category of special protection, its seeds germinate one or two years after being dispersed, so they are considered dormant. The objective of this research was to determine the morphological and physiological changes in T. globosa seeds exposed to different treatments to break dormancy. Seeds were subjected to three treatments: scarification with liquid N2 (Treatment 1); scarification, application of gibberellic acid (GA4/7), cold stratification alternating with warm stratification, and cold stratification (Treatment 2), and double scarification with liquid N2, alternated with warm stratification and GA4/7 (Treatment 3). No germinated seeds were observed in any of the tested treatments. In Treatment 1 there was embryo growth and 3.8 % of the seeds broke their coat at 90 days. After 120 days of applying the treatments, it was possible to detect trans-zeatin (0.008-0.009 µg mg-1), cis-zeatin (0.029 µg mg-1) and abscisic acid (ABA) (0.0002-0.0023 µg mg-1) in the seed coat; kinetin (0.011 µg mg-1), trans-zeatin (0.008-0.011 µg mg-1) and indoleacetic acid (IAA) (0.009 µg mg-1) were found in the megagametophyte. Hormones cytokinins (trans-zeatin, cis-zeatin, kinetin) and auxins (IAA) were at higher concentration in both the control and treated seeds. No gibberellins were detected in any of the treatments. Phloretin, p-hydroxybenzoic acid (HBA), catechin, naringenin and protocathaeuic acid were found in the coat of the treated seeds, while sinapinic acid, HBA, and catechin, which are considered as germination inhibitors, were present in the megagametophyte. Seeds of T. globosa show morphophysiological dormancy caused by immaturity of the embryo and the presence of germination inhibitors.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Taxus globosa]]></kwd>
<kwd lng="es"><![CDATA[fenoles]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[hormonas]]></kwd>
<kwd lng="es"><![CDATA[latencia]]></kwd>
<kwd lng="es"><![CDATA[semillas]]></kwd>
<kwd lng="en"><![CDATA[Taxus globosa]]></kwd>
<kwd lng="en"><![CDATA[dormancy]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[hormones]]></kwd>
<kwd lng="en"><![CDATA[phenols]]></kwd>
<kwd lng="en"><![CDATA[seeds]]></kwd>
</kwd-group>
</article-meta>
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