<?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>1027-152X</journal-id>
<journal-title><![CDATA[Revista Chapingo. Serie horticultura]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo Ser.Hortic]]></abbrev-journal-title>
<issn>1027-152X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1027-152X2021000300157</article-id>
<article-id pub-id-type="doi">10.5154/r.rchsh.2021.01.003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The use of plant growth retardants in tomato (Solanum lycopersicum L.) seedlings]]></article-title>
<article-title xml:lang="es"><![CDATA[Uso de retardadores de crecimiento vegetal en plántulas de jitomate (Solanum lycopersicum L.)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miguel-Zarate]]></surname>
<given-names><![CDATA[Norma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayala-Garay]]></surname>
<given-names><![CDATA[Oscar J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-del Castillo]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magdaleno-Villar]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Posgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>27</volume>
<numero>3</numero>
<fpage>157</fpage>
<lpage>169</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1027-152X2021000300157&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1027-152X2021000300157&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1027-152X2021000300157&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract An alternative tomato production system consists of establishing three short crop cycles per year and managed with a high population density (9 plants·m-2) and early blunting. For this purpose, it is necessary to extend the seedbed phase until two months. The aim of this study was to evaluate the effect of three growth retardants (Uniconazole, Paclobutrazol and Propiconazole) on the quality of DRD 8537 commercial hybrid tomato seedlings, with one or two applications (at 25 and 50 days after sowing [das]) and two doses per retardant (low and high). Plant height, stem diameter, and number of leaves were evaluated at 31, 49 and 66 das. In addition, the leaf area, fresh weight, and dry matter content of the plants were evaluated at 66 das. The retardants affected height, diameter, fresh weight, and dry matter. The number of applications had no significant effect, and the high dose reduced height and leaf area. The retardants allowed extending seedling time on the seedbed until two months without affecting plant quality. Paclobutrazol was the retardant with the best response in terms of reducing height and leaf area, resulting in more compact seedlings.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Un sistema alternativo de producción de jitomate consiste en establecer tres ciclos cortos de cultivo al año manejados con alta densidad de población (9 plantas·m-2) y despuntes tempranos. Para lograr lo anterior, es necesario alargar la fase de almacigo hasta dos meses. En este estudio, el objetivo fue evaluar el efecto de tres retardadores de crecimiento (Uniconazol, Paclobutrazol y Propiconazol), con una o dos aplicaciones (a los 25 y 50 días después de la siembra [dds]) y dos dosis por retardador (baja y alta), sobre la calidad de plántulas de jitomate del híbrido comercial DRD 8537. A los 31, 49 y 66 dds se evaluó la altura de planta, el diámetro de tallo y el número de hojas. A los 66 dds, además de lo anterior, se evaluó el área foliar, el peso fresco y el contenido de materia seca de la planta. Los retardadores afectaron la altura, el diámetro, el peso fresco y la materia seca. El número de aplicaciones no tuvo efecto significativo, y la dosis alta redujo la altura y el área foliar. Los retardadores permitieron alargar el periodo de la plántula en almacigo a dos meses, sin afectar su calidad. El Paclobutrazol fue el retardador que tuvo mejor respuesta en la reducción de la altura y el área foliar, lo cual se traduce en plántulas más compactas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[intensive cultivation]]></kwd>
<kwd lng="en"><![CDATA[growth retardant]]></kwd>
<kwd lng="en"><![CDATA[seedbed]]></kwd>
<kwd lng="en"><![CDATA[cycle reduction]]></kwd>
<kwd lng="en"><![CDATA[triazoles]]></kwd>
<kwd lng="es"><![CDATA[cultivo intensivo]]></kwd>
<kwd lng="es"><![CDATA[regulador de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[semillero]]></kwd>
<kwd lng="es"><![CDATA[reducción de ciclo]]></kwd>
<kwd lng="es"><![CDATA[triazoles]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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