<?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>S1659-13212024000100014</article-id>
<article-id pub-id-type="doi">10.15517/am.2024.55692</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta fisiológica de Solanum phureja bajo déficit hídrico]]></article-title>
<article-title xml:lang="en"><![CDATA[Physiological response of Solanum phureja under water deficit]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Rendón]]></surname>
<given-names><![CDATA[Juan Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Hernández]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meneses Buitrago]]></surname>
<given-names><![CDATA[Diego Hernan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopez-Peñafiel]]></surname>
<given-names><![CDATA[Hyrcania-Vanessa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA) Centro de Investigación Obonuco ]]></institution>
<addr-line><![CDATA[ Pasto]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA) Centro de Investigación Obonuco ]]></institution>
<addr-line><![CDATA[ Pasto]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Corporación Colombiana de investigación Agropecuaria (AGROSAVIA) Centro de Investigación Obonuco ]]></institution>
<addr-line><![CDATA[ Pasto]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Nariño  ]]></institution>
<addr-line><![CDATA[ Pasto]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212024000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212024000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212024000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Los parámetros de respuesta fisiológica al estrés por sequía son la conjugación de una serie de atributos de acción lenta o rápida. Las variables de intercambio gaseoso son catalogadas como de respuesta rápida, su nivel de aparición o afección dependen de la interacción entre factores como el genotipo y duración, intensidad y etapa fenológica de ocurrencia del estrés. Objetivo. Identificar los niveles de respuesta fisiológica que presenta Solanum phureja bajo el estrés progresivo por déficit hídrico. Materiales y métodos. El experimento se realizó entre 2019 y 2020, bajo condiciones semi-controladas en el Centro de Investigación Obonuco de la Corporación Colombiana de Investigación Agropecuaria. Se sembraron cuatro cultivares de papa, la mitad del ensayo se mantuvo con riego a capacidad de campo y a la otra parte se le suspendió para inducir estrés por déficit hídrico durante 15 días, luego se rehidrataron; se evaluaron variables de intercambio gaseoso, clorofila y eficiencia fotosintética cada tres días. Resultados. Se presentaron diferencias significativas con los valores máximos de intercambio gaseoso en plantas del tratamiento control con 16,67 µmol m-2 s-1 tasa de fotosíntesis (A); 0,34 mol m-2 s-1 conductancia estomática (gs) 5,5 mmol m-2 s-1 transpiración (E) y en estrés 1,17 µmol m-2 s-1 (A); 0,013 mol m-2 s-1 (gs); 0,29 mmol m-2 s-1 (E). En cuanto al contenido de clorofila, se presentaron valores entre 451,7 y 474,69 mg m-2 con riego y sin riego, respectivamente. Conclusiones. El cierre estomático fue la respuesta más temprana al déficit hídrico, además, las plantas de papa presentaron recuperación de los valores de intercambio gaseoso después del suministro de riego posterior al estrés. Finalmente, se identificaron tres niveles de respuesta fisiológica, estrés leve, moderado y severo, según la intensidad y duración del estrés, lo cual es de utilidad para futuros estudios y planteamientos de calendarios de riego.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. The parameters of physiological response to drought stress are the result of a combination of slow- or fast-acting attributes. Gas exchange variables are classified as fast-acting and their level of occurrence or impact depends on the interaction between factors such as genotype and the duration, intensity, and phenological stage of stress occurrence. Objective. To identify the levels of physiological response exhibited by Solanum phureja under progressive water deficit stress. Materials and methods. The experiment was conducted between 2019 and 2020 under semi-controlled conditions at the Obonuco Research Center of the Corporación Colombiana de Investigación Agropecuaria. Four potato cultivars were planted, with half of the trial was maintained at field capacity and the other half subjected to water deficit stress by withholding irrigation for 15 days, followed by rehydration. Gas exchange variables, chlorophyll content, and photosynthetic efficiency were evaluated every three days. Results. Significant differences were observed, with maximum gas exchange values in control plants showing 16.67 µmol m-2 s-1 photosynthesis rate (A); 0.34 mol m-2 s-1 stomatal conductance (gs); 5.5 mmol m-2 s-1 transpiration (E), and under stress, 1.17 µmol m-2 s-1 (A); 0.013 mol m-2 s-1 (gs); 0.29 mmol m-2 s-1 (E). Chlorophyll content values ranged between 451.7 and 474.69 mg m-2 with and without irrigation, respectively. Conclusions. Stomatic closure was the earliest response to water deficit, and potato plants showed recovery in gas exchange values after rehydration following stress. Finally, three levels of physiological response were identified: mild, moderate, and severe stress, depending on the intensity and duration of stress, which is useful for future studies and the development of irrigation schedules.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estrés por sequía]]></kwd>
<kwd lng="es"><![CDATA[fotosíntesis]]></kwd>
<kwd lng="es"><![CDATA[papa]]></kwd>
<kwd lng="es"><![CDATA[aclimatación.]]></kwd>
<kwd lng="en"><![CDATA[drought stress]]></kwd>
<kwd lng="en"><![CDATA[photosynthesis]]></kwd>
<kwd lng="en"><![CDATA[potato]]></kwd>
<kwd lng="en"><![CDATA[acclimatization]]></kwd>
</kwd-group>
</article-meta>
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