<?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>S0034-77442024000100022</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v72i1.55748</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Microsporogénesis y ultraestructura de los granos de polen de la mora andina Rubus glaucus (Rosaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Microsporogenesis and ultrastructure of pollen grains in Rubus glaucus (Rosaceae)]]></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[Torres-Rodríguez]]></surname>
<given-names><![CDATA[Gerardo-Andrés]]></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[Cuarán]]></surname>
<given-names><![CDATA[Viviana-Lucia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos-Heredia]]></surname>
<given-names><![CDATA[Carolina]]></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 Naturales; Facultad de Ciencias Médicas y de la Salud Grupo de Investigación en Ciencias Básicas y Aplicadas para la Sostenibilidad-CIBAS]]></institution>
<addr-line><![CDATA[ Bucaramanga]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Cauca Museo de Historia Natural Unidad de Microscopía Electrónica]]></institution>
<addr-line><![CDATA[ Cauca]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<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="Af4">
<institution><![CDATA[,Universidad Nacional de la Plata Facultad de Ciencias Naturales; 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>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>72</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442024000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442024000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442024000100022&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Los estudios sobre la microsporogénesis de Rubus glaucus son inexistentes y poco es conocido sobre la ultraestructura del polen.  Objetivos:  Describir la microsporogénesis, y la ultraestructura de los granos de polen en Rubus glaucus.  Métodos:  Flores en diferentes etapas de desarrollo fueron incluidas en parafina o en resina. Las secciones se tiñeron con Safranin-Alcian Blue, PAS-Amidoblack y Lacmoid o incluidas en resina y teñidas con Azul de Toluidina. Secciones ultrafinas fueron observadas mediante microscopía electrónica de transmisión (MET). Para la observación con microscopía electrónica de barrido (MEB), el material se fijó y se deshidrató en 2.2 dimetoxipropano, luego se usó hexametildisilazano (HMDS) y las muestras se recubrieron con oro.  Resultados:  Las anteras se diferencian a partir de una masa celular en los extremos distales de los filamentos estaminales. Inicialmente, la pared de las anteras presenta varias capas celulares y al madurar se reducen a la epidermis y al endotecio. Los microsporocitos experimentan meiosis simultánea y forman tétradas tetraédricas. El tapete desarrolla actividad secretora hasta que se liberan los granos de polen, luego el contenido celular se desorganiza y experimenta autólisis. Al formarse la esporodermis, primero se deposita la exina y luego la intina en forma centrípeta. Los granos de polen son tricolporados, isopolares, oblados a peroblados, con simetría radial, de contorno circular con ápices romos en vista polar, elipsoidales en vista ecuatorial. La exina es gruesa, tectada, perforada estriada. La ectexina está formada por un tectum interrumpido por perforaciones y gruesas columelas. La membrana del colpo posee pequeños gránulos como restos de exina y orbículas en la superficie. La intina desarrolla patrones estructurales conocidos. El polenkit es inconspicuo.  Conclusión:  El desarrollo de las anteras sigue los patrones de las angiospermas. La microsporogénesis simultánea, el depósito centrípeto de la esporodermis, y los patrones de ornamentación observados han sido descritos previamente para la Familia Rosaceae.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Studies on the microsporogenesis of Rubus glaucus are non-existent and little is known about the ultrastructure of the pollen grains.  Objectives:  To describe the microsporogenesis process, and ultrastructural aspects of the pollen grains in Rubus glaucus.  Methods:  Flowers at different developmental stages were embedded in paraffin. Sections were stained with Safranin-Alcian Blue, PAS-Amidoblack and Lacmoid or included in resin and stained with toluidine blue. Ultrathin sections were examined by transmission electron microscopy (TEM). For scanning electron microscopy (SEM) observation, the material was fixed and dehydrated in 2.2 dimethoxypropane, then with Hexamethyldisilazane (HMDS), and the samples were coated with gold.  Results:  Anthers are differentiated by a cellular mass at the ends distal to the staminal filaments. During development, the anther wall presents several cellular layers and at maturity, they are reduced to the epidermis and the endothecium. Microsporocytes undergo simultaneous meiosis and form tetrahedral tetrads. The tapetum develops secretory activity until pollen grains are released, then the cellular content undergoes autolysis. During sporodermis formation, the exine is first deposited and then the intine in a centripetal form. The pollen grains are tricolporate, isopolar, oblate to peroblate, with radial simetry, circular in outline with blunt apices in polar view, ellipsoidal in equatorial view. The exine is thick, tectated, striate perforate. The sporodermis presents an ectexine formed by a tectum interrupted by perforations and thick columellae. Colpus membrane presents small exine granules and orbicules on the surface. The intine develops known structural patterns. Pollenkitt is inconspicuous.  Conclusion:  Anthers structure and development follows the known patterns of angiosperms. Simultaneous microsporogenesis and centripetal deposition of the sporodermis, as well as ornamentation patterns, have been previously described for the Rosaceae Family.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[blackberry]]></kwd>
<kwd lng="en"><![CDATA[microspore]]></kwd>
<kwd lng="en"><![CDATA[palynology]]></kwd>
<kwd lng="en"><![CDATA[pollen ontogeny]]></kwd>
<kwd lng="en"><![CDATA[Rosaceae]]></kwd>
<kwd lng="en"><![CDATA[sporodermis]]></kwd>
<kwd lng="en"><![CDATA[tapetum.]]></kwd>
<kwd lng="es"><![CDATA[esporodermis]]></kwd>
<kwd lng="es"><![CDATA[microspora]]></kwd>
<kwd lng="es"><![CDATA[mora]]></kwd>
<kwd lng="es"><![CDATA[ontogenia del polen]]></kwd>
<kwd lng="es"><![CDATA[palinología]]></kwd>
<kwd lng="es"><![CDATA[Rosaceae]]></kwd>
<kwd lng="es"><![CDATA[tapete.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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