<?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>S1405-31952007000200169</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tamaños de semilla, substancias vigorizantes y pruebas de vigor en sorgos tolerantes al frío]]></article-title>
<article-title xml:lang="en"><![CDATA[Seed sizes, invigorization substances, and vigor tests in cold tolerant sorghums]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valadez-Gutiérrez]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Onofre]]></surname>
<given-names><![CDATA[Leopoldo E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Córdova-Téllez]]></surname>
<given-names><![CDATA[Leobigildo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vaquera-Huerta]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Castillo]]></surname>
<given-names><![CDATA[Ma. del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-de los Santos]]></surname>
<given-names><![CDATA[Gabino]]></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[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2007</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>169</fpage>
<lpage>179</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952007000200169&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952007000200169&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952007000200169&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El lento crecimiento durante el establecimiento en campo de híbridos de sorgo (Sorghum bicolor L. Moench) tolerantes al frío en los Valles Altos Centrales de México, se ha atribuido al efecto de bajas temperaturas y al reducido tamaño de la semilla. De abril a mayo de 2005, en condiciones de laboratorio, se evaluaron 36 tratamientos en un diseño de bloques completos al azar con cuatro repeticiones, producto de la combinación factorial de tres genotipos (VA-110 y dos líneas mantenedoras B1 y B9), tres tamaños de semilla (grande, mediano y chico) y cuatro tipos de vigorización a la semilla (osmoacondicionamiento, Maxi Grow T. S.®, nitrato de potasio y testigo), en tres pruebas de vigor: 1) germinación estándar; 2) frío; 3) frío modificada, en la cual la fase de germinación se mantuvo sin luz. La unidad experimental fue 25 semillas. Las variables analizadas fueron: el porcentaje de germinación, plántulas anormales y semillas muertas; la longitud (cm) promedio de plúmula y de radícula, por plántula; y el peso seco (mg) total de plúmulas, radículas y restos de semillas de cada unidad experimental. La longitud de la plúmula fue mayor (p&#8804;0.05) en la prueba de frío pero la radícula se elongó más (p&#8804;0.05) en la prueba de frío modificada. El peso seco total de plúmulas fue superior 3 a 4 veces al peso seco total de radículas, según las condiciones de germinación. La variedad VA-110 superó (p&#8804;0.05) en germinación y vigor a las líneas B1 y B9. No siempre los mayores tamaños de semilla exhibieron las mayores expresiones de germinación y vigor, debido a su interacción con genotipos y con las substancias vigorizantes. Los tratamientos de vigorización no fueron una alternativa factible para superar el problema de lento crecimiento de plántula de los genotipos de sorgo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Slow growth during the field establishment of cold tolerant sorghum (Sorghum bicolor L. Moench) in the Central High Valleys of México, has been attributed to the effect of low temperatures and to small seed size. From April to May of 2005, under laboratory conditions, 36 treatments were evaluated in a complete randomized block design with four replicates, product of the factorial combination of three genotypes (VA-110 and two maintainer lines, B1 and B9), three seed sizes (large, medium and small) and four types of seed invigorization (osmoconditioning, Maxi Grow T.S.®, potassium nitrate, and control), in three vigor tests: 1) standard germination; 2) cold; 3) modified cold, in which the germination phase was maintained without light. The experimental unit consisted of 25 seeds. The variables analyzed were: percentage of germination, abnormal seedlings, and dead seeds; average length (cm) of plumule and radicle per seedling; and total dry weight (mg) of plumules, radicles and remains of seeds of each experimental unit. The length of the plumule was greater (p&#8804;0.05) in the cold test, but the radicle was longer (p&#8804;0.05) in the modified cold test. Total dry weight of plumules was 3 to 4 times greater than the total dry weight of radicles, according to the germination conditions. The variety VA-110 surpassed (p&#8804;0.05) lines B1 and B9 in germination and vigor. The largest seed sizes did not always exhibit the highest expressions of germination and vigor, due to their interaction with genotypes and with the invigorization substances. The invigorization treatments were not a viable alternative for overcoming the problem of slow growth of the seedling of the sorghum genotypes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sorghum bicolor L. Moench]]></kwd>
<kwd lng="es"><![CDATA[acondicionamiento osmótico]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[prueba de frío]]></kwd>
<kwd lng="en"><![CDATA[Sorghum bicolour L. Moench]]></kwd>
<kwd lng="en"><![CDATA[osmotic conditioning]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[cold test]]></kwd>
</kwd-group>
</article-meta>
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<article-title xml:lang=""><![CDATA[Flowers thinning, seed yield and post-anthesis dry matter distribution in sorghum]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2006</year>
<volume>40</volume>
<page-range>303-14</page-range></nlm-citation>
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</article>
