<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342020000900081</article-id>
<article-id pub-id-type="doi">10.29312/remexca.v0i24.2360</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Relaciones hídricas e intercambio gaseoso en alfalfa bajo condiciones de sequía]]></article-title>
<article-title xml:lang="en"><![CDATA[Water relations and gas exchange in lucerne under drought conditions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna-Guerrero]]></surname>
<given-names><![CDATA[Milton Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Castañeda]]></surname>
<given-names><![CDATA[Cándido]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quero Carrillo]]></surname>
<given-names><![CDATA[Adrián Raymundo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Haro]]></surname>
<given-names><![CDATA[José Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Cerrilla]]></surname>
<given-names><![CDATA[María Esther]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Hernández]]></surname>
<given-names><![CDATA[Pedro Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2020</year>
</pub-date>
<volume>11</volume>
<numero>spe24</numero>
<fpage>81</fpage>
<lpage>92</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342020000900081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342020000900081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342020000900081&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se estudió el efecto del déficit hídrico edáfico en las relaciones hídricas e intercambio gaseoso de diez variedades de alfalfa (M. sativa L.) en invernadero con riego (R) y sequía (S). Se utilizó un diseño de bloques completos al azar con cuatro repeticiones en R y cuatro en S. La unidad experimental fue una planta individual en un tubo de PVC de 4&#8221; y 1 m de alto. Las plántulas se trasplantaron en los tubos, 20 d después de la germinación en charolas para almacigo. La fertilización se hizo al aplicar la fórmula 60-140-00 a los 44, 240 y 420 dds. En R el contenido hídrico del suelo se mantuvo cercano a CC [20-406 ddt, R1 y 406-688 ddt, R2] y en S la aplicación de agua se suspendió por 61 d (345-406 ddt, S1) y 68 d (620-688 ddt, S2). El potencial hídrico (&#968;), osmótico (&#960;) y de turgencia (p) y la tasa de asimilación (A) y transpiración (E), y la conductancia estomática (g) más bajos en S1 fueron &#968;= -3.1, &#960;= -3.5 y p= 0.4 MPa; A= 4.4 µmol CO2 m-2 s-1, E= 0.022 mol H2O m-2 s-1 y g= 0.7 mmol H2O m-2 s-1), y en S2 &#968; = -3.5, &#960; = -3.7 y p= 0.2 MPa; A = 4 µmol CO2 m-2 s-1, E= 0.019 mol H2O m-2 s-1 y g= 0.7 mmol H2O m-2 s-1. El ajuste osmótico (AO) y la eficiencia en el uso del agua (W) mostraron valores finales de 1.7 MPa y 0.0058 mmol CO2 mmol-1 H2O-1 en S1 y 1.96 MPa y 0.0061 mmol CO2 mmol-1 H2O-1 en S2. Las variedades Genex, Júpiter, Atlixco y Milenia con altos niveles de AO, A, E, g y W mostraron mejor comportamiento y tolerancia al estrés hídrico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The effect of the edaphic water deficit on the water relations and gas exchange of ten varieties of lucerne (M. sativa L.) in the greenhouse with irrigation (I) and drought (D) were studied. A randomized complete block design was used with four replications in I and four in D. The experimental unit was an individual plant in a 4&#8221; PVC tube and 1 m high. The seedlings were transplanted into the tubes, 20 d after germination in storage trays. Fertilization was done by applying formula 60-140-00 at 44, 240 and 420 dds. In I the soil water content remained close to CC [20-406 ddt, I1 and 406-688 ddt, I2] and in S the application of water was suspended for 61 d (345-406 ddt, D1) and 68 d (620-688 ddt, D2). The lowest water potential (&#968;), osmotic (&#960;) and turgidity (p) and the rate of assimilation (A) and transpiration (E), and the lowest stomatal conductance (g) in I1 were &#968;= -3.1, &#960;= -3.5 and p= 0.4 MPa; A= 4.4 µmol CO2 m-2 s-1, E= 0.022 mol H2O m-2 s-1 and g= 0.7 mmol H2O m-2 s-1), and in S2 &#968; = -3.5, &#960; = -3.7 and p= 0.2 MPa; A = 4 µmol CO2 m-2 s-1, E= 0.019 mol H2O m-2 s-1 and g= 0.7 mmol H2O m-2 s-1. The osmotic adjustment (OA) and the efficiency in the use of water (W) showed final values of 1.7 MPa and 0.0058 mmol CO2 mmol-1 H2O-1 in S1 and 1.96 MPa and 0.0061 mmol CO2 mmol-1 H2O-1 in S2. The Genex, Jupiter, Atlixco and Milenia varieties with high levels of OA, A, E, g and W showed better behavior and tolerance to water stress.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ajuste osmótico]]></kwd>
<kwd lng="es"><![CDATA[asimilación]]></kwd>
<kwd lng="es"><![CDATA[eficiencia en el uso del agua]]></kwd>
<kwd lng="es"><![CDATA[transpiración]]></kwd>
<kwd lng="en"><![CDATA[assimilation]]></kwd>
<kwd lng="en"><![CDATA[efficiency in the use of water]]></kwd>
<kwd lng="en"><![CDATA[osmotic adjustment]]></kwd>
<kwd lng="en"><![CDATA[transpiration]]></kwd>
</kwd-group>
</article-meta>
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