<?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>S0034-77442020000300933</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v68i3.40893</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Morfología del polen de Heliconia spp. (Heliconiaceae) de México y su relación interespecífica e intraespecífica]]></article-title>
<article-title xml:lang="en"><![CDATA[Pollen morphology of Heliconia spp. (Heliconiaceae) from Mexico and its interspecific and intraspecific relationship]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Curiel]]></surname>
<given-names><![CDATA[Simitrio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Guillén]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avendaño-Arrazate]]></surname>
<given-names><![CDATA[Carlos-Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Bolaños]]></surname>
<given-names><![CDATA[Misael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>68</volume>
<numero>3</numero>
<fpage>933</fpage>
<lpage>946</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442020000300933&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442020000300933&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442020000300933&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El conocimiento palinológico en Heliconia, es básicamente sobre especies de Centroamérica y Sudamérica, mientras que en especies del Neotrópico mexicano los estudios son limitados.  Objetivo:  Contribuir al conocimiento palinológico y conocer la interrelación morfológica del polen del género Heliconia del Neotrópico mexicano, como parte de los estudios de biología reproductiva que puedan contribuir en futuros trabajos de mejoramiento genético.  Métodos:  El estudio se realizó en nueve especies (12 accesiones) de Heliconia nativas de México y que se encuentran establecidas en el Banco de Germoplasma del Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias (INIFAP). Se recolectó polen de flores en antesis y se conservó durante 24 h en glutaraldehído al 2 % y etanol al 50 %, en seguida se lavó en etanol al 50 % y deshidrató en alcohol al 70, 90 y 100 % por 30 min c/u. Las muestras se secaron por punto crítico con CO2, se montaron en bases de cilindros de aluminio cubiertas con cinta de carbón conductivo doble adhesiva y, se analizaron con una capa de aproximadamente 20 nm de oro-paladio. Las muestras se observaron en MEB modelo TOPCON, SM-510.  Resultados:  El polen mide de 50.22 a 70.56 µm, es heteropolar y es de forma euoblato, suboblato u oblato-esferoidal. Las caras distal y proximal presentan diferentes grados de convexidad; ambas con ornamentación microequinada o microverrugosa. Las características morfológicas, forma del polen, forma de las caras proximal y distal, así como la ornamentación, muestran cierta homogeneidad. Sin embargo, mediante el análisis de agrupamiento jerárquico (R2 = 0.05) se formaron cinco grupos. El grupo I presenta microperforaciones en el téctum, alta densidad de microespinas y alta convexidad de la cara proximal; el grupo II, contrario al grupo I, tienen la cara distal convexa con densidad de microespinas media y la cara proximal plana a subconvexa. El grupo III lo representa H. latispatha y el grupo IV H. librata, los dos grupos son de polen pequeño (para el presente estudio). Aunque H. latispatha tiene cara distal con verrugas, la cara proximal plana y poro germinativo distinto-protudente, H. librata tiene verrugas en ambas caras. En el grupo V se agrupa H. collinsiana, la cual tiene poro germinativo distinto-protudente y una forma de &#8220;círculo acanalado&#8221; en la cara proximal. Entre variedades, H. collinsiana var. collinsiana es 10 µm superior a H. collinsiana var. velutina en su eje ecuatorial.  Conclusiones:  La heterogeneidad de caracteres permitió generar grupos polínicos mientras que las características relativamente homogéneas permitieron reconocer especies y variedades dentro de los grupos. La morfología de las especies de Heliconia de México se ajusta a los caracteres previamente descritos; sin embargo, resaltan características adicionales como la presencia de microporos y la forma de &#8220;círculo acanalado&#8221; en la cara proximal.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Knowledge about palynology in the Heliconia genus basically concerns species from Central and South America, while studies of species in the Mexican Neotropic are limited.  Objective:  To contribute to the palynological knowledge and understand the morphological interrelation of pollen from the Heliconia genus of the Mexican Neotropic, as part of reproductive biology studies that may contribute in future works of genetic improvement.  Methods:  The study was conducted in nine species (12 accessions) of Heliconia native to Mexico which are found in the Germplasm Bank of the National Institute of Agricultural and Livestock Forestry Research (INIFAP). Floral pollen was collected in anthesis and stored for 24 h in 2 % glutaraldehyde and 50 % ethanol, then washed in 50 % ethanol and dehydrated in 70, 90 and 100 % alcohol for 30 min. The samples were left to dry at the critical point of the CO2, mounted in aluminum cylinders covered with double conductive adhesive carbon tape and analyzed with a layer of approximately 20 nm gold-palladium. Samples were observed in MEB model TOPCON, SM-510.  Results:  Pollen measures, 50.22 µm to 70.56 µm, is heteropolar and has an euoblate, suboblate or oblate-spheroidal shape. Distal and proximal faces presented different degrees of convexity; both with micro-echinate or micro-verrucate ornamentation. Morphological characteristics, pollen shape, shape of the proximal and distal faces, as well as ornamentation, showed some homogeneity. However, five groups were formed through the analysis of hierarchical grouping (R2 = 0.05). Group I present some micro-perforations in the tectum, high density of micro-echinates and high convexity of the proximal face. In contrast to Group I, Group II has their distal face convex with half density of micro-echinates and a plane-subconvex proximal face. Group III is represented by H. latispatha and group IV is represented by H. librata, both groups have small pollen (for the present study). Although, H. latispatha has a verrucae distal face and a plane proximal face, germinating pore that is distinctively protruding, and H. librata has verrucae in both faces. In group V, H. collinsiana has a distinctively protruding germinating pore and a &#8220;corrugated circle-shaped&#8221; in the proximal face. Among varieties, H. collinsiana is 10 µm higher than H. collinsiana var. velutina in its equatorial plane.  Conclusions:  Heterogeneity of characteristics allowed pollen groups to be generated; whilst relatively homogeneous characteristics allowed for recognition of species and varieties within the groups. The morphology of the Heliconia species in Mexico confirms the previously described characteristics; however, additional features such as the presence of micropores and the corrugated circle-shaped in the proximal face stand out.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[palynology]]></kwd>
<kwd lng="en"><![CDATA[Heliconia]]></kwd>
<kwd lng="en"><![CDATA[endemic]]></kwd>
<kwd lng="en"><![CDATA[diversity]]></kwd>
<kwd lng="en"><![CDATA[neotropical]]></kwd>
<kwd lng="es"><![CDATA[palinología]]></kwd>
<kwd lng="es"><![CDATA[Heliconia]]></kwd>
<kwd lng="es"><![CDATA[endémica]]></kwd>
<kwd lng="es"><![CDATA[diversidad]]></kwd>
<kwd lng="es"><![CDATA[neotropical]]></kwd>
</kwd-group>
</article-meta>
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