<?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>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512022000100502</article-id>
<article-id pub-id-type="doi">10.21829/abm129.2022.1857</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Germinación, crecimiento inicial y morfología de Castilla elastica (Moraceae) en Tabasco, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Germination, initial growth and morphology of Castilla elastica (Moraceae) in Tabasco, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Custodio-Rodríguez]]></surname>
<given-names><![CDATA[José P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Simón]]></surname>
<given-names><![CDATA[Georgina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Sánchez]]></surname>
<given-names><![CDATA[Wilfrido M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<numero>129</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512022000100502&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512022000100502&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512022000100502&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Castilla elastica es una especie nativa de Mesoamérica asociada a diferentes culturas prehispánicas que utilizaban su látex para fines ceremoniales. Es un árbol emblemático, útil en sistemas agroforestales. Este trabajo tuvo por objetivo evaluar la germinación, crecimiento inicial y morfología de C. elastica.  Métodos:  Se colectaron semillas de 30 árboles y se sembraron en bandejas de polietileno. El inicio de la germinación se determinó por la emergencia de los epicótilos. Se cuantificó el porcentaje de germinación y se establecieron tres periodos de evaluación del crecimiento cada 45 días. Se evaluaron la longitud de tallo (Lt) y el diámetro de tallo (Db). Se obtuvo la tasa absoluta de crecimiento (TAC) y la tasa relativa de crecimiento (TRC). Adicionalmente, se realizaron pruebas de regresión simple entre Lt y Db y se calculó una regresión asociando la TAC de la Lt con algunas variables climáticas. La evaluación del crecimiento tuvo una duración de 205 días.  Resultados clave:  Se obtuvo 100% de germinación, el proceso inició a los 12 días. A los 205 días, las plantas alcanzaron una Lt y un Db promedio (±1 DE) de 36.5 cm (±5.27) y 8.2 mm (±0.55), respectivamente. Los tres períodos de evaluación mostraron diferencias estadísticas significativas. De acuerdo con los modelos de regresión, C. elastica crece 0.188 cm día-1 por cada milímetro de incremento en Db.  Conclusiones:  La utilización de semillas recién cosechadas asegura 100% de la germinación. Se obtuvieron diferentes etapas de desarrollo de la plántula en función del tiempo (205 días). La TRC disminuyó después de la primera evaluación atribuible a la radiación solar. Este trabajo demostró la factibilidad de producir plantas de C. elastica y contar con el requisito mínimo como planta de calidad en cuanto a la Lt y Db promedio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Castilla elastica is a Mesoamerican native species associated with different Prehispanic cultures that used their latex for ceremonial purposes. It is considered an emblematic tree, useful in agroforestry systems. This work aimed to evaluate the germination, initial growth and morphology of C. elastica.  Methods:  Seeds from 30 trees were collected and planted in polyethylene trays. The start of the germination was determined by the sprouting of the epicotyls. The percentage of germination was quantified, and three periods of evaluation were established, every 45 days. Stem length (Lt) and basal stem diameter (Db) were evaluated. Absolute (RGA) and relative (RGR) growth rates were also obtained. Additionally, simple regression tests were made, and a regression was calculated associating RGA from Lt against some climatic variables. Growth evaluation of the plants lasted 205 days.  Key results:  Germination was obtained in 100%, the process initiated at 12 days. At 205 days, plants reached an average (±1 SD) Lt and Db of 36.5 cm (±5.27) and 8.2 mm (±0.55), respectively. The three evaluation periods showed significant statistical differences. According to regression models, C. elastica grows 0.188 cm day-1 for each millimeter of increase in Db.  Conclusions:  The use of recently harvested seeds guarantees 100% germination. Different stages of development of the seedling depending on the time (205 days) were obtained. The RGR decreased after the first evaluation, being attributable to the solar radiation. This work demonstrated the feasibility of producing C. elastica plants, reaching the minimal required quality standards in terms of its average Lt and Db.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[eófilos]]></kwd>
<kwd lng="es"><![CDATA[fenología]]></kwd>
<kwd lng="es"><![CDATA[plántulas]]></kwd>
<kwd lng="es"><![CDATA[radiación solar]]></kwd>
<kwd lng="es"><![CDATA[semillas]]></kwd>
<kwd lng="es"><![CDATA[tasas de crecimiento]]></kwd>
<kwd lng="en"><![CDATA[eophylls]]></kwd>
<kwd lng="en"><![CDATA[growth rates]]></kwd>
<kwd lng="en"><![CDATA[phenology]]></kwd>
<kwd lng="en"><![CDATA[seedlings]]></kwd>
<kwd lng="en"><![CDATA[seeds]]></kwd>
<kwd lng="en"><![CDATA[solar radiation]]></kwd>
</kwd-group>
</article-meta>
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