<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442021000200403</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69i2.44711</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Micromorfología y ultraestructura de las anteras y los granos de polen en diez genotipos élite de Theobroma cacao (Malvaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Micromorphology and ultrastructure of anthers and pollen grains in ten elite genotypes of Theobroma cacao (Malvaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rincón-Barón]]></surname>
<given-names><![CDATA[Edgar-Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zarate]]></surname>
<given-names><![CDATA[Diego-A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agudelo-Castañeda]]></surname>
<given-names><![CDATA[Genaro-Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuarán]]></surname>
<given-names><![CDATA[Viviana-Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Passarelli]]></surname>
<given-names><![CDATA[Lilian-M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Santander Facultad de Ciencias de la Salud Grupo de Investigación Agroambiente y Salud-MICROBIOTA]]></institution>
<addr-line><![CDATA[ Bucaramanga]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria-AGROSAVIA Centro de Investigación La Suiza ]]></institution>
<addr-line><![CDATA[ Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de La Plata Facultad de Ciencias Naturales y Museo de La Plata Laboratorio de Estudios de Anatomía Vegetal Evolutiva y Sistemática (LEAVES)]]></institution>
<addr-line><![CDATA[ La Plata]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<numero>2</numero>
<fpage>403</fpage>
<lpage>421</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000200403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000200403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000200403&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  A pesar de que T. cacao es una especie importante a nivel mundial por la producción de cacao, es poco lo que se conoce sobre la micromorfología y estructura de las anteras y los granos de polen.  Objetivos:  Describir y analizar la estructura y micromorfología de las anteras y los granos de polen de 10 genotipos élite de esta importante especie tropical.  Métodos:  Se tomaron más de 30 anteras de flores en antesis de los 10 genotipos élite de T. cacao del banco de germoplasma ex situ del Centro de Investigaciones Suiza-Agrosavia (Rionegro, Santander-Colombia). El material se procesó de acuerdo con los protocolos estándar para embeber y seccionar en parafina. Las secciones obtenidas (3 &#956;m) se tiñeron con azul de Safranina-Alcian para discriminar estructuras con paredes primarias y secundarias y polifenoles totales. Además, se usó la técnica PAS-Amidoblack para diferenciar entre polisacáridos estructurales y de reserva, así como proteínas. Para la determinación de esporopolenina y polifenoles se usó la tinción azul de toluidina y finalmente para descripciones adicionales se aplicó la tinción azul alcián-PAS-hematoxilina. Las observaciones se realizaron mediante microscopio fotónico y microscopio de epifluorescencia. Para la observación con microscopía electrónica de barrido (MEB), las anteras con los granos de polen se fijaron y deshidrataron en 2.2 dimetoxipropano, luego se desecaron hasta un punto crítico y finalmente se recubrieron con oro.  Resultados:  Las anteras son bitecas y están sostenidas por un largo filamento formado por un estrato epidérmico, tejido parenquimatoso y un haz vascular. La dehiscencia ocurre longitudinalmente a través del estomio. La pared de la antera madura está formada por una capa epidérmica monoestratificada, una capa de células endoteliales con engrosamientos fibrilares lignificados y se pueden apreciar restos celulares del tapete y abundantes orbículas recubriendo la cavidad de los microesporangios. Los tejidos epidérmicos y parenquimatosos de las anteras almacenan polifenoles. Las orbículas son generalmente esféricas, psiladas y exhiben las mismas reacciones de tinción y fluorescencia que la exina de los granos de polen. Los granos de polen son mónades, isopolares, pequeños (16-19 µm) con amb circular, esferoidales, tricolpados con colpos medianos o cortos (5-10 µm) con membrana ornamentada, semitectatos, reticulados, heterobrochados, las paredes del retículo ornamentadas o no, con microgránulos de diferente tamaño o escabrados. Los análisis estadísticos mostraron que existen diferencias significativas en el tamaño de los granos de polen (P &#706; 0.05). Se observa que los granos de polen más pequeños son los del genotipo TCS 19 (16.890 µm) y se diferencian del resto de genotipos, y entre estos no se observan diferencias significativas. Solo dos genotipos (SCC 19 y SCA 6) presentaron polenkit y solo uno tiene paredes perforadas (SCA 6).  Conclusiones:  La estructura y micromorfología de las anteras de T. cacao son similares a las descritas para otras Malvaceae. Así mismo, los granos de polen mostraron variaciones de tamaño, ornamentación de las paredes y del lumen del retículo y presencia de polenkit. Sin embargo, no se observó relación entre las variaciones de los caracteres micromorfológicos analizados en los granos de polen y los modelos de compatibilidad polínica reportados para estos genotipos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Despite the fact that T. cacao is an important species worldwide for cocoa production, little is known about the micromorphology and structure of anthers and pollen grains.  Objectives:  To describe and analyze the structure and micromorphology of the anthers and pollen grains of 10 elite genotypes of this important tropical species.  Methods:  More than 30 anthers of flowers in anthesis were taken of the 10 elite genotypes of T. cacao from the ex situ germplasm bank of the Suiza-Agrosavia Research Center (Rionegro, Santander-Colombia). The anthers with the pollen grains were fixated and processed according to the standard protocols for embedding and sectioning in paraffin. Sections obtained (3 &#956;m thick) were stained with Safranin-Alcian blue to discriminate structures with primary and secondary walls and total polyphenols. Additionally, the samples were also stained with the PAS-Amidoblack technique was used to differentiate between structural and reserve polysaccharides as well as proteins. Toluidine blue staining was used for the determination of sporopollenin and polyphenols and finally Alcian blue-PAS-Hematoxylin staining was applied for additional descriptions. Observations were made using photonic microscopy and epifluorescence microscopy. For observation with scanning electron microscopy (SEM) the anthers with the pollen grains were fixed and dehydrated in 2.2 Dimethoxypropane, then desiccated to critical point and finally coated with gold.  Results:  The anthers are dithecal and supported by a long filament made up of an epidermal stratum, parenchymal tissue, and a vascular bundle. The dehiscence occurs longitudinally through the stomium. The anther wall is made up of a monostratified epidermal layer, followed by a layer of endothecial cells with lignified fibrillar thickenings, cellular remnants of tapetum and abundant orbicules can be seen covering the cavity of the microsporangia. The epidermal and parenchymal tissues of the anthers are abundant in polyphenols. Orbicules are generally spherical, psilated, and these exhibit the same staining and fluorescence reactions as exine from pollen grains. The pollen grains are monades, isopolar, small (16-19 µm) with circular amb, spheroidal, tricolpate with medium or short colpi (5-10 µm) with sculptured membrane, semitectate, reticulated, heterobrochate, sculptured or non- sculptured walls, with microgranules of different size or scabrate. The statistical analyzes showed that there are significant differences in the size of the pollen grains (P &#706; 0.05). It is observed that the smallest pollen grains are those of the TCS 19 genotype (16.890 µm) and are different from the other genotypes, and among these there are no significant differences. Only two genotypes (SCC 19 and SCA 6) showed pollenkit and only one has perforated walls (SCA 6).  Conclusions:  The structure and micromorphology of the anthers of T. cacao are similar to those described for other Malvaceae. Likewise, the pollen grains showed variations in size, ornamentation of the sporoderm and the lumen of the reticulum and the presence of pollenkitt. However, no relationship was observed between the micromorphological characters analyzed in the pollen grains and the pollen compatibility models reported for these genotypes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cocoa]]></kwd>
<kwd lng="en"><![CDATA[microornamentation]]></kwd>
<kwd lng="en"><![CDATA[sporopollenin]]></kwd>
<kwd lng="en"><![CDATA[histochemistry]]></kwd>
<kwd lng="en"><![CDATA[palynology]]></kwd>
<kwd lng="en"><![CDATA[pollenkitt]]></kwd>
<kwd lng="es"><![CDATA[cacao]]></kwd>
<kwd lng="es"><![CDATA[microornamentación]]></kwd>
<kwd lng="es"><![CDATA[esporopolenina]]></kwd>
<kwd lng="es"><![CDATA[histoquímica]]></kwd>
<kwd lng="es"><![CDATA[palinología]]></kwd>
<kwd lng="es"><![CDATA[polenkit]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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</ref>
</ref-list>
</back>
</article>
