<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802021000400635</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.4.635</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Leaf gas exchange of new cocoa clones under an agroforestry system in Antioquia, Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Intercambio gaseoso de nuevos clones de cacao establecidos en un sistema agroforestal en Antioquia, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Ceballos]]></surname>
<given-names><![CDATA[Diana Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mejía-Londoño]]></surname>
<given-names><![CDATA[Henry Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Jiménez]]></surname>
<given-names><![CDATA[Jamer Alexis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monsalve-García]]></surname>
<given-names><![CDATA[Danilo Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Arredondo]]></surname>
<given-names><![CDATA[Juan David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Córdoba-Gaona]]></surname>
<given-names><![CDATA[Oscar de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria Centro de Investigación El Nus ]]></institution>
<addr-line><![CDATA[San Roque Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Agrarias Departamento de Ciencias Agronómica]]></institution>
<addr-line><![CDATA[Antioquia ]]></addr-line>
<country>Colombia</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>44</volume>
<numero>4</numero>
<fpage>635</fpage>
<lpage>642</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000400635&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000400635&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000400635&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Photosynthetic activity allows knowing the behavior of a species and its relationship with the environmental conditions where it develops, which can be modified by the components of an agroforestry system. In order to compare gas exchange variables in cocoa (Theobroma cacao L.) clones TCS01, TCS06, TCS13, TCS19 and CCN51 planted in an agroforestry system with abarco trees (Cariniana pyriformis Miers), net photosynthesis (A), stomatal conductance (gs) and transpiration (E) were evaluated on a fully developed young cocoa leaf in six plants of each of the clones every hour from 08:00 to 17:00 hours (n = 5000) for five days,. Areas under the curve (AUC) were estimated for each variable from the gas exchange data based on the sum of the of the fractionated trapezoidal areas. The AUC data were subjected to analysis of variance, and the treatments were compared by the Tukey test (P &#8804; 0.05). Clone TCS06 presented the highest accumulated net photosynthesis (A) with a value of 137,300 µmol CO2 m-2 day-1,surpassing clones TCS19 and TCS01. Maximum values of A = 6.6 µmol CO2 m2 s-1 (TCS06), gs = 0.12 mmol CO2 m-2 s-1 (CCN51) and E = 4.52 mmol H2O m-2 s-1 (CCN51) were found. According to the physiological performance of the cocoa clones under an agroforestry system with abarco trees, clones TCS06 stood out compared to TCS13, TCS19 and CCN51. Clone TCS06 presented the highest photosynthetic rate as a function of the daily integral of gas exchange compared to TCS19 and TCS13. CCN51 was the clone that required the highest photosynthetically active radiation to achieve maximum photosynthetic activity.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La actividad fotosintética permite conocer el comportamiento de una especie y su relación con las condiciones ambientales donde se desarrolla, las cuales pueden ser modificadas por los componentes que integran un sistema agroforestal. Con el objetivo de comparar las variables de intercambio gaseoso en los clones de cacao (Theobroma cacao) TCS01, TCS06, TCS13, TCS19 y CCN51 plantados en un sistema agroforestal con árboles de abarco (Cariniana pyriformis Miers), se evaluó la fotosíntesis neta (A), la conductancia estomática (gs) y la transpiración (E) en una hoja de cacao joven completamente desarrollada en seis plantas de cada uno de los clones, cada hora entre las 08:00 y 17:00 horas (n = 5000) por cinco días, Con los datos de intercambio gaseoso se estimaron las áreas bajo la curva (ABC) para cada variable con base en la sumatoria de las áreas trapezoidales fraccionadas. Los datos de las ABC fueron sometidos a análisis de varianza y los tratamientos comparados por la prueba de medias Tukey (P &#8804; 0.05). El clon TCS06 presentó la mayor fotosíntesis neta acumulada con un valor de 137.000 µmol CO2 m-2 día-1, superando a los clones TCS19 y TCS01. Se registraron valores máximos de A = 6,6 µmol CO2 m2 s-1 (TCS06), gs = 0,12 mmol CO2 m-2 s-1 (CCN51) y E = 4,52 mmol H2O m-2 s-1 (CCN51). De acuerdo con el comportamiento de los clones de cacao en el sistema agroforestal con abarco, los clones TC606 y TCS01 sobresalieron con respecto a TCS13, TCS19 y CCN51. El clon TCS06 presentó la mayor tasa fotosintética en función de la integral diaria del intercambio gaseoso en comparación con TCS19 y TCS13. El CCN51 fue el clon que requirió los mayores valores de radiación fotosintéticamente activa para lograr la máxima actividad fotosintética.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[CO2 assimilation rate]]></kwd>
<kwd lng="en"><![CDATA[daily integral of gas exchange]]></kwd>
<kwd lng="en"><![CDATA[photosynthesis]]></kwd>
<kwd lng="en"><![CDATA[stomatal conductance]]></kwd>
<kwd lng="en"><![CDATA[transpiration]]></kwd>
<kwd lng="es"><![CDATA[Conductancia estomática]]></kwd>
<kwd lng="es"><![CDATA[fotosíntesis]]></kwd>
<kwd lng="es"><![CDATA[integral diaria del intercambio de gases]]></kwd>
<kwd lng="es"><![CDATA[tasa de asimilación de CO2]]></kwd>
<kwd lng="es"><![CDATA[transpiración]]></kwd>
</kwd-group>
</article-meta>
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