<?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>S0187-71512021000100108</article-id>
<article-id pub-id-type="doi">10.21829/abm128.2021.1781</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Desarrollo de la corteza: Estudio comparativo en dos especies de Ceiba (Malvaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Bark development: Comparative study of two Ceiba (Malvaceae) species]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guía-Ramírez]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terrazas]]></surname>
<given-names><![CDATA[Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Rodríguez]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yáñez-Espinosa]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tejero-Díez]]></surname>
<given-names><![CDATA[José Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala Unidad de Morfología y Función]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología, Ciudad Universitaria ]]></institution>
<addr-line><![CDATA[Cd. Mx. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Investigación de Zonas Desérticas ]]></institution>
<addr-line><![CDATA[ Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<numero>128</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512021000100108&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512021000100108&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512021000100108&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Ceiba aesculifolia y C. pentandra (Malvaceae) son dos de las cuatro especies de Ceiba presentes en México. Se conocen como &#8220;pochotes&#8221;; sus cortezas tienen usos ornamentales y medicinales. Con la finalidad de encontrar atributos distintivos entre estas dos especies de amplia distribución en el país, se realizó un estudio comparativo de la estructura anatómica de la corteza a lo largo de sus ejes y su relación con posibles adaptaciones ecológicas.  Métodos:  Se recolectaron muestras desde las ramas nuevas hasta el tronco principal de cuatro individuos en un bosque tropical caducifolio de los estados de México y Puebla. Se realizaron cortes histológicos de la corteza con un microtomo de deslizamiento; las secciones se tiñeron con safranina-verde rápido y se montaron en resina sintética.  Resultados clave:  La corteza es ligeramente fisurada a fisurada en tallos maduros, de color gris plomizo en C. aesculifolia y verde en C. pentandra; con aguijones. La peridermis se origina de un estrato subepidérmico en los ápices de las ramas; conforme los ejes aumentan en diámetro, los radios se dilatan fuertemente (forma de embudo) y las fibras del floema se organizan en estratos, características compartidas con otras Bombacoideae (Malvaceae). Ceiba pentandra mantiene parches de peridermis que se alternan con epidermis, aguijones no estratificados y drusas escasas (&lt;20/mm2), mientras que en C. aesculifolia hay ritidoma, aguijones estratificados y drusas abundantes (50-60/mm2).  Conclusiones:  Detalles de los cambios estructurales a lo largo del eje, además de las diferencias encontradas entre ambas especies, se reportan por primera vez para Ceiba. La rápida diferenciación de la peridermis en las ceibas estudiadas se interpreta como una adaptación para protección de la luz solar y la desecación; aspecto que ha sido observado en otras especies que crecen en ambientes estacionales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Ceiba aesculifolia and C. pentandra (Malvaceae) are two of the four Ceiba species growing in Mexico. They are recognized as "pochotes" and have ornamental and medicinal use of their bark. In order to find distinctive attributes between these species of wide distribution in the country, a comparative study of the anatomical structure of the bark along its axes and the relationship with possible ecological adaptations were carried out.  Methods:  Samples from the new branches to the main trunk of four individuals were collected from the deciduous tropical forest of the State of Mexico and Puebla. Histological sections of the bark were cut with sliding microtome; the sections were stained with safranine-fast green and mounted in synthetic resin.  Key results:  The bark is slightly fissured to fissured on mature stems, leaden-gray color in C. aesculifolia and green in C. pentandra; with prickles. The peridermis originates from a subepidermal layer at the branch tips; as the axes increase in diameter, the rays strongly dilate (wedge-shaped) and the phloem fibers are organized in strata, characteristics shared with other Bombacoideae (Malvaceae). Ceiba pentandra maintains patches of peridermis that alternate with epidermis, unstratified prickles and few druses (&lt;20/mm2), while in C. aesculifolia there is a rhytidome, stratified prickles, and abundant druses (50-60/mm2).  Conclusions:  Details of structural changes along the axis, in addition to the differences found between both species are reported for the first time for Ceiba. The rapid differentiation of the peridermis in the ceibas studied is interpreted as an adaptation to protect against sunlight and desiccation; an aspect that has been observed in other species growing in seasonal environments.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[bosque tropical caducifolio]]></kwd>
<kwd lng="es"><![CDATA[córtex]]></kwd>
<kwd lng="es"><![CDATA[ontogenia]]></kwd>
<kwd lng="es"><![CDATA[peridermis]]></kwd>
<kwd lng="es"><![CDATA[pochote]]></kwd>
<kwd lng="en"><![CDATA[cortex]]></kwd>
<kwd lng="en"><![CDATA[deciduous tropical forest]]></kwd>
<kwd lng="en"><![CDATA[ontogeny]]></kwd>
<kwd lng="en"><![CDATA[peridermis]]></kwd>
<kwd lng="en"><![CDATA[pochote]]></kwd>
</kwd-group>
</article-meta>
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