<?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>S1659-13212021000300719</article-id>
<article-id pub-id-type="doi">10.15517/am.v32i3.42303</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación agronómica y fisiológica en clones de camote (Ipomoea batatas) sometidos a condiciones de estrés hídrico]]></article-title>
<article-title xml:lang="en"><![CDATA[Agronomic and physiological evaluation in sweet potato (Ipomoea batatas) clones subjected to hydric stress conditions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Pacheco]]></surname>
<given-names><![CDATA[Rommel Igor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Macias]]></surname>
<given-names><![CDATA[Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuenmayor-Campos]]></surname>
<given-names><![CDATA[Francia Concepción]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Izquierdo]]></surname>
<given-names><![CDATA[Adrián José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Yzquierdo]]></surname>
<given-names><![CDATA[Gustavo Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villagran-Munar]]></surname>
<given-names><![CDATA[Edwin Andres]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigación Agrícola  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigación Agrícola  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigación Agrícola  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[ ]]></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>32</volume>
<numero>3</numero>
<fpage>719</fpage>
<lpage>732</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212021000300719&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212021000300719&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212021000300719&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Las raíces y tubérculos como el camote (Ipomoea batatas L.) se encuentran entre los seis primeros cultivos más importantes del mundo. Sin embargo, esta especie es sensible al estrés por déficit hídrico. El uso de genotipos resistentes a la sequía y mejores prácticas de gestión del agua pueden mejorar la calidad y el rendimiento de la raíz. Para ampliar la productividad en tales ambientes se pueden utilizar prácticas de riego complementario o identificar genotipos con potencial de rendimiento promisorios frente a estas condiciones. Objetivo. Evaluar el efecto del estrés hídrico en variables fisiológicas y agronómicas en clones de camote. Materiales y métodos. Se realizó un ensayo en el período de abril-julio 2015 en el Centro Nacional de Investigación Agropecuaria, Maracay, Venezuela, con tres repeticiones bajo un diseño en parcelas divididas, donde la parcela principal estuvo conformada por tres niveles de riego (todo el ciclo, dos y tres primeros meses con riego) y la parcela secundaria por tres clones de camote. Se midieron variables asociadas al intercambio gaseoso, crecimiento vegetativo, biomasa y rendimiento. Resultados. Las plantas de camote frente a condiciones de sequía disminuyeron su crecimiento, expansión foliar, cerraron en forma parcial los estomas para evitar pérdidas de agua por transpiración sin afectar las variables de tasa neta de asimilación de CO2, rendimiento y acumulación de biomasa. El mejor clon fue el 64, con mayor transpiración, acumulación de biomasa y rendimiento de 18,3 t ha-1. El riego en todo el cultivo generó el mayor crecimiento vegetativo con 125 hojas planta-1. Conclusiones. Bajo condiciones de estrés hídrico las plantas de camote se adaptaron fisiológicamente para no perder agua por la transpiración sin sacrificar las tasas de fotosíntesis, con las cuales los clones lograron alcanzar una acumulación de biomasa aérea, raíces y rendimiento del tubérculo similar al cultivo con riego.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. Roots and tubers, such as sweet potatoes (Ipomoea batatas L.), are among the top six most important crops worldwide. However, this species is sensitive to stress due to water deficit. The use of drought resistant genotypes and better water management practices can enhance its&#8217; root quality and yield. In order to enhance productivity in those environments, complementary irrigation practices can be used or genotypes with promising yield potential against these conditions can be identified. Objective. To evaluate the effect of water stress on physiological and agronomic variables in sweet potato clones. Materials and methods. A trial was conducted from April to July 2015 at the National Center for Agricultural Research, Maracay, Venezuela, with three replications under a split plot design, where the principal plot was integrated by three irrigation treatments (all cycles, two, and three first months with irrigation) and the secondary plot by three sweet potatoes clones. Variables associated with gas exchange, vegetative growth, biomass, and yield were measured. Results. The results show that sweet potato plants against drought conditions decreased their growth, foliar expansion, partially closed the stomata avoiding water losses through transpiration without affecting the variables of net assimilation rate of CO2, yield, and biomass accumulation. The best clone with increased transpiration, biomass accumulation, and yield of 18.3 t ha-1 was the 64. Irrigation throughout the crop cycle generated the highest vegetative growth with 125 leaves plant-1. Conclusions. Under water stress conditions, sweet potato plants adapted physiologically to avoid water loss through transpiration without sacrificing photosynthetic rates, with which the clones were able to accumulate aerial biomass, roots, and tuber yield similar to the irrigated crop.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[crecimiento]]></kwd>
<kwd lng="es"><![CDATA[intercambio gaseoso]]></kwd>
<kwd lng="es"><![CDATA[productividad]]></kwd>
<kwd lng="es"><![CDATA[sequía]]></kwd>
<kwd lng="en"><![CDATA[growth]]></kwd>
<kwd lng="en"><![CDATA[gas exchange]]></kwd>
<kwd lng="en"><![CDATA[productivity]]></kwd>
<kwd lng="en"><![CDATA[drought]]></kwd>
</kwd-group>
</article-meta>
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