<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322023000600080</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v14i80.1395</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fenología de estructuras reproductivas de Pseudotsuga menziesii (Mirb.) Franco]]></article-title>
<article-title xml:lang="en"><![CDATA[Phenology of reproductive structures of Pseudotsuga menziesii (Mirb.) Franco]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-Hernández]]></surname>
<given-names><![CDATA[Sara Irene]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz-Gutierrez]]></surname>
<given-names><![CDATA[Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Hernández]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castelán-Lorenzo]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo División de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Conservación y Mejoramiento de Ecosistemas Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma Chapingo Preparatoria Agrícola ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>14</volume>
<numero>80</numero>
<fpage>80</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322023000600080&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322023000600080&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322023000600080&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Conocer el inicio, el fin y la duración de la receptividad femenina y de la dispersión de polen permite generar información para el establecimiento de programas para la producción y manejo de semillas, así como de mejoramiento genético. El objetivo de este estudio fue determinar los periodos de receptividad de los estróbilos femeninos y la dispersión de polen en una plantación de árboles jóvenes de Pseudotsuga menziesii que se han tratado con ácido giberélico (AG4/7 y AG3) para promover la floración temprana. Se dio seguimiento a 12 árboles con estructuras reproductivas femeninas y masculinas. Se definieron las fechas de inicio, fin y duración de cada una de las etapas fenológicas de la floración con el macro SYNCHRO de SAS. El periodo de receptividad de las estructuras femeninas fue, en promedio, de 14 días, mientras que la dispersión de polen duró entre cinco y seis días. Las etapas de receptividad femenina y la dispersión de polen presentaron alta sincronización (PO=0.60 y 0.64), los coeficientes de correlación entre los eventos fenológicos fueron altos, positivos (r=0.87) y significativos (p&#8804;0.001). Se concluye que la dispersión de polen y la receptividad femenina están sincronizados y no son independientes, por lo que existe la probabilidad de cruzamiento entre los árboles.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Determining the beginning, the end, and the time length of each reproductive stage in ovule receptivity as well as in pollen dispersal allows to generate information for a genetic improvement program. The general goal was to determine the period for the receptivity of female strobili and pollen dispersal on a young tree plantation of Pseudotsuga menziesii treated with gibberellic acid (GA 4/7 and GA3) to promote flowering. Twelve trees with reproductive structures were monitored; three branches with female strobili and three branches with male structures were marked in each tree. The initial and end dates and time length of each of the phenological stages of flowering were registered and determined with the SYNCHRO macro using SAS software. The receptivity period of female strobili lasted on average 14 days, while pollen dispersal lasted between five and six days. The female receptivity periods and pollen dispersal showed high synchronization (P=0.60 and 0.64), while the correlation coefficients between phenological events are high and positive (r=0.87), in addition to being significant values (p&#8804;0.001). Thus, the phenological events of pollen dispersal and female receptivity are highly synchronized and are not independent, so there is the probability of crossing between the trees.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ácido giberélico]]></kwd>
<kwd lng="es"><![CDATA[dispersión de polen]]></kwd>
<kwd lng="es"><![CDATA[inducción floral]]></kwd>
<kwd lng="es"><![CDATA[manejo de semillas]]></kwd>
<kwd lng="es"><![CDATA[receptividad femenina]]></kwd>
<kwd lng="es"><![CDATA[sincronización fenológica]]></kwd>
<kwd lng="en"><![CDATA[Gibberellic acid]]></kwd>
<kwd lng="en"><![CDATA[pollen dispersal]]></kwd>
<kwd lng="en"><![CDATA[floral induction]]></kwd>
<kwd lng="en"><![CDATA[seed management]]></kwd>
<kwd lng="en"><![CDATA[female receptiveness]]></kwd>
<kwd lng="en"><![CDATA[phenological synchronization]]></kwd>
</kwd-group>
</article-meta>
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