<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982022000401000</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3023</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Seasonal changes in gas exchange and yield of 21 genotypes of Coffea arabica]]></article-title>
<article-title xml:lang="es"><![CDATA[Cambios estacionales en el intercambio de gases y rendimiento de 21 genotipos de Coffea arabica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tezara]]></surname>
<given-names><![CDATA[Wilmer]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duicela Guambi]]></surname>
<given-names><![CDATA[Luis Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reynel Chila]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nazareno Ortiz]]></surname>
<given-names><![CDATA[Rene]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bolaños Ortega]]></surname>
<given-names><![CDATA[Milton José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Técnica Luis Vargas Torres Facultad de Ciencias Agropecuarias Estación Experimental Mutile]]></institution>
<addr-line><![CDATA[Esmeraldas ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central de Venezuela Facultad de Ciencias Instituto de Biología Experimental]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Escuela Superior Politécnica Agropecuaria de Manabí Manuel Félix López Campus Politécnico El Limón ]]></institution>
<addr-line><![CDATA[ El Morro]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>100</volume>
<numero>4</numero>
<fpage>1000</fpage>
<lpage>1013</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982022000401000&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982022000401000&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982022000401000&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Coffee breeding programs in Ecuador have information on production and disease tolerance in many genotypes; however, they lack physiological information, especially on photosynthetic characteristics and their response to drought.  Questions:  Whether high genetic variability among coffee genotypes will explains the photosynthetic and production differences expected? Will the physiological response to the dry season (DS) be different between genotypes?  Studied species: Coffea arabica L.  Study site and dates:  Pichincha canton, Manabí province, Ecuador during March-April 2017 (rainy season, RS) and June-July 2017 (DS).  Methods:  Leaf relative water content (RWC) and gas exchange of 21 coffee genotypes were measured during DS and RS. Coffee production during a period of three years was evaluated.  Results:  Significant differences were found in RWC, photosynthetic rate (A), stomatal conductance (gs) and water use efficiency (WUE) among genotypes, between seasons, an interaction effect of genotype × season. Drought caused a significant reduction in A and gs of 30 and 44 % respectively, while WUE was not affected. A positive linear relationship was found between A and gs, and a negative relationship between A and the leaf-air vapor pressure gradient (&#916;W) and between gs and &#916;W. Differences in coffee production were found among genotypes.  Conclusions:  The high genetic variability of C. arabica genotypes may explain the significant differences in RWC and gas exchange and interaction genotypes x season, suggesting a differential response of each genotype to drought. Eleven of the 21 coffee genotypes were sensitive to drought, but showed different responses, suggesting possible genotypic differences in tolerance.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Los programas de mejoramiento genético del café en Ecuador tienen información sobre producción y tolerancia a enfermedades en muchos genotipos; sin embargo, carecen de información sobre características fotosintéticas y su respuesta a la sequía.  Preguntas:  ¿La alta variabilidad genética entre los genotipos de café explicará las diferencias fotosintéticas y de producción esperadas? ¿Será diferente la respuesta fisiológica a la estación seca (DS) entre los genotipos?  Especie de estudio: Coffea arabica L.  Sitio de estudio y fechas:  Cantón Pichincha, provincia de Manabí, Ecuador durante la temporada de lluvias (RS) y DS del 2017.  Métodos:  Se midieron el contenido relativo de agua foliar (CRA) y el intercambio gaseoso de 21 genotipos de café durante RS y DS. Se evaluó la producción de café durante un período de tres años.  Resultados:  Se encontraron diferencias significativas en el CRA, A, gs y la EUA entre genotipos, temporadas, e interacción genotipo × temporada. La sequía causó una reducción en A y gs del 30 y 44 %, mientras que EUA no varió. Se encontró una relación lineal positiva entre A y gs, y negativa entre A y &#916;W y entre gs y &#916;W. Se encontraron diferencias en la producción de café entre genotipos.  Conclusiones:  La variabilidad genética de los genotipos de C. arabica explicó las diferencias en CRA, A, gs y la interacción genotipo × temporada, sugirió una respuesta diferencial de cada genotipo a la sequía. Once de los 21 genotipos de café fueron sensibles a la sequía; mostrando posibles diferencias genotípicas en la tolerancia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Bean yield]]></kwd>
<kwd lng="en"><![CDATA[coffee]]></kwd>
<kwd lng="en"><![CDATA[drought]]></kwd>
<kwd lng="en"><![CDATA[photosynthesis]]></kwd>
<kwd lng="en"><![CDATA[water use efficiency]]></kwd>
<kwd lng="es"><![CDATA[Café]]></kwd>
<kwd lng="es"><![CDATA[eficiencia de uso de agua]]></kwd>
<kwd lng="es"><![CDATA[fotosíntesis]]></kwd>
<kwd lng="es"><![CDATA[rendimiento]]></kwd>
<kwd lng="es"><![CDATA[sequía]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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