<?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>S0187-73802020000500565</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2020.4-a.565</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta fotosintética de lechuga hidropónica a relaciones de NO3 -/NH4 + en verano y otoño]]></article-title>
<article-title xml:lang="en"><![CDATA[Photosynthetic response of hydroponic lettuce to NO3 -/NH4 + ratios in summer and autumn]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara-Izaguirre]]></surname>
<given-names><![CDATA[Ana Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Velázquez]]></surname>
<given-names><![CDATA[Angel N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Tobías]]></surname>
<given-names><![CDATA[Hugo M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcala-Jauregui]]></surname>
<given-names><![CDATA[Jorge A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-Cortés]]></surname>
<given-names><![CDATA[Heriberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Méndez]]></surname>
<given-names><![CDATA[Mauricio J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[San Luis Potosí S.L.P.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>4a</numero>
<fpage>565</fpage>
<lpage>573</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802020000500565&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802020000500565&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802020000500565&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La lechuga (Lactuca sativa L.) es un importante cultivo alimenticio y es cultivada en todo el mundo. Su rendimiento fotosintético y metabólico es dependiente de parámetros de luz y de temperatura. Por otro lado, la fuente del suministro de nitrógeno (N) a la planta se relaciona de manera directa con la eficiencia fotosintética; por este motivo la fotosíntesis es afectada por la disponibilidad de N y por la radiación. Con base en lo anterior, el objetivo del trabajo fue evaluar la respuesta fotosintética del cultivo de lechuga en hidroponía con relaciones nitrato/amonio (NO3 -/NH4 +) en verano y otoño. Las lechugas se cultivaron en un sistema hidropónico de raíz flotante. El diseño experimental fue completamente al azar, con arreglo factorial 4 x 2, cuatro relaciones de NO3 -/NH4 + (100/0, 80/20, 65/35 y 50/50) y dos estaciones (verano y otoño), con un total de ocho tratamientos y 300 unidades experimentales (en cada estación). Se evaluaron las variables: eficiencia máxima del fotosistema II (Fv/Fm), eficiencia efectiva del fotosistema II (&#1060;PSII), tasa de transporte de electrones (ETR), asimilación neta de CO2 (Pn), tasa de transpiración (E) y conductancia estomática (gs). Las condiciones ambientales del otoño promovieron un aumento en todas las variables de fotosíntesis. La relación 100/0 aumentó 17.5 % más &#1060;PSII y 15.73 % más gs. La interacción estación verano con la relación 50/50 disminuyó la Fv/Fm a 0.78 y en ETR la 100/0 fue menor en un 41.76 %. La aplicación de NH4 + en dosis mayores al 35 % en la solución nutritiva disminuyó las variables de fotosíntesis en el cultivo de lechuga en verano. La reacción fotosintética asociada con crecientes proporciones de N amoniacal en la solución nutritiva es dependiente de la estación de cultivo (verano u otoño), al parecer asociada con la temperatura y radiación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Lettuce (Lactuca sativa L.) is an important food crop that is grown worldwide. Its photosynthetic and metabolic performance is dependent on light and temperature parameters. On the other hand, the source of the nitrogen (N) supply to the plant is directly related to photosynthetic efficiency, which is why photosynthesis is affected by the availability of N and by radiation. Based on the above, the aim of the research was to evaluate the photosynthetic response of the lettuce crop in hydroponics with nitrate/ammonium ratios (NO3 -/NH4 +) in summer and autumn. The lettuces were grown in a floating root hydroponic system. The experimental design was completely random, with factorial arrangement 4 x 2, four ratios of NO3 -/NH4 + (100/0, 80/20, 65/35 and 50/50) and two seasons (summer and autumn), with a total of eight experimental units with 300 plants per season. Maximum efficiency of photosystem II (Fv/Fm), effective efficiency of photosystem II (&#1060;PSII), electron transport rate (ETR), net CO2 assimilation (Pn), transpiration rate (E) and stomata conductance (gs) were evaluated. The environmental conditions of autumn promoted an increase in all the variables of photosynthesis. The 100/0 ratio increased 17.5 % plus &#1060;PSII and 15.73 % plus gs. The summer season interaction with the 50/50 ratio decreased Fv/Fm to 0.78 and in ETR the 100/0 was lower by 41.76 %. The application of NH4 + in the nutritive solution in doses greater than 35 % decreased the variables of photosynthesis in the lettuce crop in summer. The photosynthetic reaction associated with increasing proportions of ammonia N in the nutrient solution is dependent on the growing season (summer or autumn), apparently associated with temperature and radiation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lactuca sativa L.]]></kwd>
<kwd lng="es"><![CDATA[amonio]]></kwd>
<kwd lng="es"><![CDATA[estación de cultivo]]></kwd>
<kwd lng="es"><![CDATA[fotosíntesis]]></kwd>
<kwd lng="es"><![CDATA[nitrato]]></kwd>
<kwd lng="en"><![CDATA[Lactuca sativa L.]]></kwd>
<kwd lng="en"><![CDATA[ammonium]]></kwd>
<kwd lng="en"><![CDATA[growing season]]></kwd>
<kwd lng="en"><![CDATA[nitrate]]></kwd>
<kwd lng="en"><![CDATA[photosynthesis]]></kwd>
</kwd-group>
</article-meta>
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