<?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>2079-3480</journal-id>
<journal-title><![CDATA[Cuban Journal of Agricultural Science]]></journal-title>
<abbrev-journal-title><![CDATA[Cuban J. Agric. Sci.]]></abbrev-journal-title>
<issn>2079-3480</issn>
<publisher>
<publisher-name><![CDATA[Editorial del Instituto de Ciencia Animal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2079-34802021000400403</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Characterization of the floral structure and evaluation of seeds production from different materials of Tithonia diversifolia Hemsl.) A. Gray. in Cuba]]></article-title>
<article-title xml:lang="es"><![CDATA[Caracterización de la estructura floral y evaluación de la producción de semillas de diferentes materiales de Tithonia diversifolia Hemsl. A. Gray. en Cuba]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez García]]></surname>
<given-names><![CDATA[Idalmis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padilla Corralea]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina Mesa]]></surname>
<given-names><![CDATA[Yolaine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ciencia Animal  ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>55</volume>
<numero>4</numero>
<fpage>403</fpage>
<lpage>413</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802021000400403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802021000400403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802021000400403&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In order to characterize the reproductive structure, the production and seed germination of different materials of Tithonia diversifolia Hemsl.) A. Gray, a total of three experiments were performed at different times and five plant materials were evaluated (3, 10, 16, 23, 25). The harvest of ten heads (2018 and 2019) was carried out by means of a random sampling at five points on the diagonal of the field. The evaluated materials constitute the treatments. A completely random design was used for the analysis of the variables diameter (cm) and seed heads weight (g), number and weight (mg) of full and empty seeds and of PGS seed heads-1. To the total number and the germination percentage of seed at different times 3, 5, 7 and 30 days) a simple classification non-parametric analysis of variance was performed. The studied materials showed phenotypic differences in terms of their reproductive structure. The seed heads of material 25 had a higher diameter. Material 16, due to its higher weight, distinguished itself from the rest of the evaluated materials. The waste from the seed heads is approximately 71.18 % of their total weight. The seed production of materials 10, 23 and 25 is very similar with respect to the total number of seeds in the seed heads, as well as the number of empty seeds. However, material 23 showed a lower number of full seeds (P &#8804; 0.0005). These results contribute to the knowledge of the reproductive characteristics of each specific material, which will allow the development of future studies related to the gamic seed production strategy.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para caracterizar la estructura reproductiva, la producción y la germinación de semillas de diferentes materiales de Tithonia diversifolia Hemsl.) A. Gray, se desarrollaron tres investigaciones en diferentes momentos y se evaluaron cinco materiales vegetales (3,10, 16, 23, 25). Se realizó la cosecha de diez cabezuelas (2018 y 2019) mediante un muestreo al azar en cinco puntos en la diagonal del campo. Los materiales evaluados constituyen los tratamientos. Se utilizó un diseño completamente aleatorizado para el análisis de las variables diámetro (cm) y peso de las cabezuelas (g), número y peso (mg) de semillas llenas y vacías y de SPG cabezuelas-1. Al número total y al por ciento de germinación de las semillas (en diferentes momentos 3, 5, 7 y 30 días) se les realizó análisis de varianza no paramétrico de clasificación simple. Los materiales estudiados presentaron diferencias fenotípicas en cuanto a su estructura reproductiva. Las cabezuelas del material 25 tuvieron mayor diámetro. El material 16, por su mayor peso, se distinguió del resto de los materiales evaluados. El desecho de las cabezuelas es, aproximadamente, de 71.18 % de su peso total. La producción de semillas de los materiales 10, 23 y 25 es muy similar con respecto al número total de semillas presentes en las cabezuelas, así como al número de semillas vacías. Sin embargo, el material 23 mostró menor número de semillas llenas (P &#8804; 0.0005). Estos resultados contribuyen al conocimiento de las características reproductivas de cada material específico, lo que permitirá desarrollar trabajos futuros, relacionados con la estrategia de producción de semilla gámica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[gamic seed]]></kwd>
<kwd lng="en"><![CDATA[Tithonia]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[inflorescences]]></kwd>
<kwd lng="es"><![CDATA[semilla gámica]]></kwd>
<kwd lng="es"><![CDATA[Tithonia]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[inflorescencias]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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