<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952018000400563</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Rendimiento de grano y sus componentes, y densidad de raíces en arroz bajo riego y secano]]></article-title>
<article-title xml:lang="en"><![CDATA[Grain yield and its components, and root density in rice under irrigation and rainfed conditions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Hernández]]></surname>
<given-names><![CDATA[Mónica B.]]></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[Kohashi-Shibata]]></surname>
<given-names><![CDATA[Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda-Colín]]></surname>
<given-names><![CDATA[Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrios-Gómez]]></surname>
<given-names><![CDATA[Edwin J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Rueda]]></surname>
<given-names><![CDATA[Carlos G.]]></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[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,INIFAP Campo Experimental Zacatepec ]]></institution>
<addr-line><![CDATA[Zacatepec Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Ciencias Agrícolas ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>4</numero>
<fpage>563</fpage>
<lpage>580</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000400563&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000400563&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000400563&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En México, el arroz (Oryza sativa L.,) se cultiva en riego y secano con restricciones de humedad y periodos frecuentes de sequía durante el ciclo. El rendimiento de grano (RG) se reduce severamente cuando la sequía coincide con la floración y el periodo de llenado del grano. El objetivo de este estudio fue evaluar el RG y sus componentes, y la densidad de raíces (DR) en ocho líneas F6 de arroz y un testigo (la variedad nacional El Silverio), en condiciones de riego (R) y secano (S) en Zacatepec, Morelos, México. Las líneas provienen de los viveros del Fondo Latinoamericano para Arroz de Riego (FLAR; Santa Rosa, Cali, Colombia). La siembra se hizo el 10 de junio de 2013, con una densidad de siembra de 100 kg ha-1 y dosis de fertilización de 180-40-40 de N-P-K. El RG y el número de granos m-2 (G M-2) fueron las características más afectadas por el déficit hídrico en S. La DR en R (74 %) y S (72 %) fue mayor en el estrato de 0-30 cm; la DR en S (0.45, 0.26, 0.18 y 0.10 cm cm-3) fue mayor que en R (0.26, 0.16, 0.10 y 0.05 cm cm-3) en todos los estratos del suelo. Las líneas 2 y 7 fueron las más productivas en R y S, y mostraron alta biomasa aérea (BM), índice de cosecha (IC) y G M-2. La línea 2, además, mostró mayor DR que las otras líneas en los estratos de 15-30, 30-50 y 50-70 cm en R y S. El testigo mostró menor RG y sus componentes, y densidad de raíces que los otros genotipos. El RG se relacionó positivamente con sus componentes en promedio de R y S. Las líneas más productivas podrían utilizarse comercialmente y como progenitores en los programas de mejoramiento del rendimiento de grano de arroz para áreas de riego y secano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In Mexico, rice (Oryza sativa L.) is cultivated under irrigation and rainfed conditions with moisture restrictions and frequent periods of drought during the growing season. Grain yield (GY) is reduced severely when drought coincides with flowering and the grain-filling period. The objective of this study was to evaluate the GY and its components, and the root density (RD) in eight F6 lines of rice and one control (the national variety El Silverio), under irrigation (I) and rainfed (R) conditions in Zacatepec, Morelos, Mexico. The lines come from the nurseries of the Latin American Fund for Irrigation Rice (FLAR, for its acronym in Spanish; Santa Rosa, Cali, Colombia). The experiment was sown on June 10, 2013, with a seeding rate of 100 kg ha-1 and a fertilization rate of 180-40-40 of N-P-K. GY and the number of grains m-2 (G M-2) were the characteristics most affected by the water deficit in R. The RD in I (74 %) and R (72 %) was higher in the stratum of 0-30 cm; the RD in R (0.45, 0.26, 0.18 and 0.10 cm cm-3) was higher than in I (0.26, 0.16, 0.10 and 0.05 cm cm-3) in every stratum of the soil. Lines 2 and 7 were the most productive in I and R, and showed high aerial biomass (BM), harvest index (HI) and G M-2. Line 2; in addition, showed higher RD than the other lines in the strata of 15-30, 30-50 and 50-70 cm in I and R. The control showed lower GY and its components, and RD than the other genotypes. GY was positively related to its components in average of I and R. The most productive lines could be used commercially and as parents in a rice breeding program for irrigation and rainfed areas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[biomasa aérea]]></kwd>
<kwd lng="es"><![CDATA[densidad de raíces]]></kwd>
<kwd lng="es"><![CDATA[déficit hídrico]]></kwd>
<kwd lng="es"><![CDATA[índice de cosecha]]></kwd>
<kwd lng="es"><![CDATA[interacción genotipo x ambiente]]></kwd>
<kwd lng="es"><![CDATA[rendimiento de grano]]></kwd>
<kwd lng="en"><![CDATA[aerial biomass]]></kwd>
<kwd lng="en"><![CDATA[root density]]></kwd>
<kwd lng="en"><![CDATA[water deficit]]></kwd>
<kwd lng="en"><![CDATA[harvest index]]></kwd>
<kwd lng="en"><![CDATA[genotype x environment interaction]]></kwd>
<kwd lng="en"><![CDATA[grain yield]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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