<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212018000300655</article-id>
<article-id pub-id-type="doi">10.15517/ma.v29i3.32910</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización química de nuevas variedades de Cenchrus purpureus tolerantes a la sequía]]></article-title>
<article-title xml:lang="en"><![CDATA[Chemical characterization of new varieties of drought tolerant Cenchrus purpureus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ledea-Rodríguez]]></surname>
<given-names><![CDATA[José Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Verdecia-Acosta]]></surname>
<given-names><![CDATA[Dani]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[La-O-León]]></surname>
<given-names><![CDATA[Orestes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ray-Ramírez]]></surname>
<given-names><![CDATA[Jorge Valentín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Pérez]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo-Amador]]></surname>
<given-names><![CDATA[Bernardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Granma  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Ciencia Animal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Técnica de Cotopaxi. Extensión La Maná  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Instituto Politécnico Nacional  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>29</volume>
<numero>3</numero>
<fpage>655</fpage>
<lpage>672</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212018000300655&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212018000300655&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212018000300655&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  El cambio climático ha modificado el comportamiento de las variables del clima, por esta razón, los pastos manifiestan un comportamiento productivo estacional, donde se modifica la deposición de carbohidratos estructurales, y en algunos casos la absorción de minerales. El objetivo de esta investigación fue caracterizar, en variedades de Cenchrus purpureus tolerantes a la sequía, la composición química de hojas y tallos a diferentes edades de rebrote en condiciones de sequía estacional. El periodo experimental abarcó del año 2013 al 2015, en la Estación Experimental de Pastos y Forrajes del Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;. Se empleó un diseño completamente aleatorizado con arreglo factorial, y se caracterizó la dinámica de la composición química de hojas y tallos de nuevas variedades de C. purpureus, en diferentes edades de rebrote y diferentes períodos climáticos (lluvioso y poco lluvioso) y su combinación (4 x 3 x 2). La interacción edad de rebrote con estación climática afectó la composición química de las hojas (p&#8804;0,001), alteró el contenido de celulosa (Cel), hemicelulosa (Hcel), fibra en detergente neutro (FDN), fibra en detergente ácido (FDA), contenido celular (CC), calcio (Ca) y sílice (Si), mientras que, en los tallos esta interacción solo afectó la concentración de FDA. El efecto aislado de la estación climática modificó en hojas (p&#8804;0,01) el contenido de fósforo (P) y lignina (Lig), en tallos el contenido de P (p&#8804;0,001). Cuando varió la edad de rebrote, hubo una modificación de la composición química de las hojas (proteína bruta y Lig) y de los tallos (proteína bruta). Las nuevas variedades de C. purpureus, bajo condiciones de degradación y sequía estacional, mostraron un patrón de comportamiento químico semejante al de las gramíneas tropicales, pero con bajos contenidos de proteína y fósforo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Climate change has modified the behavior of climate variables, for this reason, pastures manifest a seasonal productive behavior, where the deposition of structural carbohydrates is modified and in some cases the absorption of minerals. The objective of this study was to characterize, in varieties of Cenchrus purpureus tolerant to drought, the chemical composition of leaves and stems at different ages of regrowth in conditions of intense seasonal drought. The experimental period covered the years 2013 to 2015, in the Experimental Station of Pastures and Forages of the Institute of Agricultural Research &#8220;Jorge Dimitrov&#8221;. In a completely randomized design with the factorial arrangement was used, and the dynamics of the chemical composition of leaves and stems of new varieties of C. purpureus were characterized, in different ages of regrowth and different climatic periods (rainy and not very rainy), and their combination (4 x 3 x 2). The interaction age of regrowth with climatic station affected the chemical composition of the leaves (p&#8804;0.001), altering the content of cellulose (Cel), hemicellulose (Hcel), neutral detergent fiber (NDF), acid detergent fiber (ADF), cellular content (CC), calcium (Ca) and silica (Si), while in the stems this interaction only affected the concentration of ADF. The isolated effect of the climatic season modified in leaves (p&#8804;0.01) the content of phosphorus (P) and lignin (Lig), it stems the P content (p&#8804;0.001). When the regrowth age varied, there was a modification of the chemical composition of the leaves (crude protein and Lig) and stems (crude protein). The new varieties of C. purpureus under conditions of degradation and intense seasonal drought showed a pattern of chemical behavior similar to that of tropical grasses, but with low contents of protein and phosphorus.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[pared celular]]></kwd>
<kwd lng="es"><![CDATA[gramíneas]]></kwd>
<kwd lng="es"><![CDATA[carbohidratos]]></kwd>
<kwd lng="es"><![CDATA[plantas forrajeras]]></kwd>
<kwd lng="en"><![CDATA[cell walls]]></kwd>
<kwd lng="en"><![CDATA[grasses]]></kwd>
<kwd lng="en"><![CDATA[carbohydrates]]></kwd>
<kwd lng="en"><![CDATA[feed crops]]></kwd>
<kwd lng="en"><![CDATA[dietary fibers]]></kwd>
</kwd-group>
</article-meta>
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