<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982023000401145</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3282</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microsporogenesis, microgametogenesis, and pollen grain morphology of Fouquieria fasciculata (Fouquieriaceae, Ericales)]]></article-title>
<article-title xml:lang="es"><![CDATA[Microsporogénesis, microgametogénesis y morfología del grano de polen de Fouquieria fasciculata (Fouquieriaceae, Ericales)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto-Trejo]]></surname>
<given-names><![CDATA[Fabiola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamudio-Ruiz]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa-Matías]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala Unidad de Biotecnología y Prototipos]]></institution>
<addr-line><![CDATA[Tlalnepantla Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Pátzcuaro  ]]></institution>
<addr-line><![CDATA[Pátzcuaro Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Laboratorio de Microscopía Electrónica de Barrido]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></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>101</volume>
<numero>4</numero>
<fpage>1145</fpage>
<lpage>1157</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982023000401145&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982023000401145&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982023000401145&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Embryology of the male reproductive structures in Fouquieriaceae has been poorly studied. The ontogeny of the anther wall, microsporogenesis, microgametogenesis, and pollen morphology were described in detail for Fouquieria fasciculata.  Questions:  How microsporogenesis and microgametogenesis are carried out in Fouquieria fasciculata? How is the morphology of mature pollen grain?  Study species: Fouquieria fasciculata (Fouquieriaceae).  Study site and date: Río Estórax Canyon, near the El Plátano, Querétaro, Mexico.  Methods:  Floral buds and flowers at different stages of development were collected and processed for further analysis with light and scanning electron microscopy.  Results:  The development of the anther wall is of Dicotyledonous type. The anther wall consists of a single-layered epidermis covered by a thick cuticle, an endothecium with U-shaped fibrous thickenings, one middle layer and a secretory tapetum with uni or binucleate cell. Two orbicules types were characterized: doughnut-shape orbicules and aggregated orbicules with ruminate appearance. Microsporogenesis is successive, the microspore tetrads are tetrahedral. Pollen grains are prolate, tricolporate with reticulate-heterobrochate exine, and are shed in the two-celled stage.  Conclusions:  This research is the first comprehensive study of male structures ontogeny of Fouquieriaceae. Remarkable features were described in Fouquieria fasciculata, such as the differentiation of a secretory tapetum and the presence of orbicules, which are described for the first time and contribute to characterize the embryology of Fouquieriaceae.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: La embriología de las estructuras reproductivas masculinas en Fouquieriaceae ha sido poco estudiada. La ontogenia de la pared de la antera, la microsporogénesis, la microgametogénesis y la morfología del polen fueron descritas en detalle para Fouquieria fasciculata.  Preguntas:  ¿Cómo se llevan a cabo los procesos de microsporogénesis y microgametogénesis en Fouquieria fasciculata? ¿Cómo es la morfología del grano de polen maduro?  Especie de estudio: Fouquieria fasciculata (Fouquieriaceae).  Sitio de estudio y fecha: Cañón del Río Estórax cerca de El Plátano, Querétaro, México.  Métodos:  Botones florales y flores fueron recolectadas, procesadas y analizadas con microscopía de luz y microscopía electrónica de barrido.  Resultados:  El desarrollo de la pared de la antera es de tipo Dicotiledóneo. La pared de la antera consiste en una epidermis con cutícula gruesa, un endotecio con engrosamientos fibrosos en forma de U, una capa media y un tapete secretor con células uni o binucleadas. Se caracterizaron dos tipos de orbículas: orbículas con forma de dona y orbículas agregadas con apariencia ruminada. La microsporogénesis es sucesiva, las tétradas de microsporas son tetraédricas. Los granos de polen son prolados, tricolporados con exina reticulada-heterobrocada y son dispersados en etapa bicelular.  Conclusiones:  Esta investigación es el primer estudio embriológico detallado de las estructuras reproductivas masculinas en Fouquieriaceae. Características novedosas fueron descritas en Fouquieria fasciculata, tales como la diferenciación de un tapete secretor y la presencia de orbículas, descritas por primera vez y contribuyen a caracterizar la embriología de Fouquieriaceae.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[male gametophyte]]></kwd>
<kwd lng="en"><![CDATA[orbicules]]></kwd>
<kwd lng="en"><![CDATA[pollen grain]]></kwd>
<kwd lng="en"><![CDATA[secretory tapetum]]></kwd>
<kwd lng="es"><![CDATA[gametofito masculino]]></kwd>
<kwd lng="es"><![CDATA[granos de polen]]></kwd>
<kwd lng="es"><![CDATA[orbículas]]></kwd>
<kwd lng="es"><![CDATA[tapete secretor]]></kwd>
</kwd-group>
</article-meta>
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