<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682021000100123</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.51.8</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fenología floral de nueve variedades de nochebuena (Euphorbia pulcherrima willd. ex Klotzsch).]]></article-title>
<article-title xml:lang="en"><![CDATA[Floral phenology of nine poinsettia varieties (Euphorbia pulcherrima Willd. ex Klotzsch).]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Rojas]]></surname>
<given-names><![CDATA[T. de J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andrade-Rodríguez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo-Gutiérrez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villegas-Torres]]></surname>
<given-names><![CDATA[O.G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de Morelos  Facultad de Ciencias Agropecuarias]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<numero>51</numero>
<fpage>123</fpage>
<lpage>139</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682021000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682021000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682021000100123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La mayoría de los estudios fenológicos se centran en la observación de cambios en la morfología de la planta, con aparición, transformación o desaparición relativamente rápida de determinados órganos o distintos acontecimientos, que se denominan fenómenos fenológicos. El intervalo entre dos acontecimientos o fenómenos fenológicos define un estado fenológico o fase de desarrollo de las plantas. El objetivo de este trabajo fue documentar las fases fenológicas de la floración y desarrollo del fruto de la nochebuena y sus cambios anatómicos, para definir aspectos relacionados con el mejoramiento genético. Se estudiaron tres variedades de nochebuena de sol y seis cultivares de sombra. El registro de las observaciones de las fases fenológicas de la floración se inició con la pigmentación de la nervadura central de la bráctea, la cual muestra el inicio de la fase reproductiva; se hicieron observaciones diarias para describir los cambios fenológicos sucesivos hasta la formación de frutos; se usó la escala internacional Biologische Bundesanstalt, Bundessortenamt und Chemische (BBCH), que provee un sistema de codificación decimal para describir las diferentes etapas fenológicas. Se registró la duración de la floración (en días). La duración de la floración difirió en cada una de las etapas fenológicas entre variedades. En las nochebuenas de sol el inicio del desarrollo del ciatio ocurrió de manera ascendente, mientras que en las nochebuenas de sombra ocurrió en forma descendente. Los resultados permitieron documentar la fenología floral, con lo cual, en trabajos posteriores, se puede establecer un programa de mejoramiento genético que permita programar las cruzas entre variedades.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Most phenological studies focus on the observation of changes in the morphology of the plant, with relatively rapid appearance, transformation or disappearance of certain organs or different events, which are called phenological phenomena. The interval between two events or phenological phenomena defines a phenological state or development phase of plants. The objective of this work was to document the floral phenology of poinsettia and its anatomical changes, to define aspects related to genetic improvement. Three varieties of poinsettia and six shade cultivars were studied. The recording of the observations of the phenological phases of flowering began with the pigmentation of the central midrib of the bract, which shows the beginning of the reproductive phase, daily observations were made to describe the successive phenological changes until the formation of fruits; The international Biologische Bundesanstalt, Bundessortenamt und Chemische (BBCH) scale, which provides a decimal coding system, was used to describe the different phenological stages.The duration of flowering was recorded (in days). The duration of flowering differed in each of the phenological stages among varieties. On the sun poinsettias the onset of the ciatus development occurs in an ascending manner, while on the shadow poinsettias it occurs in descending manner. The results allowed documenting the floral phenology with which, in later works, a genetic improvement program can be established that allows for crossbreeding between varieties.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cambios anatómicos]]></kwd>
<kwd lng="es"><![CDATA[desarrollo de la floración y fruto]]></kwd>
<kwd lng="es"><![CDATA[estados fenológicos]]></kwd>
<kwd lng="en"><![CDATA[Anatomical changes]]></kwd>
<kwd lng="en"><![CDATA[flowering and fruit development]]></kwd>
<kwd lng="en"><![CDATA[phenological states]]></kwd>
</kwd-group>
</article-meta>
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