<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122017000300403</article-id>
<article-id pub-id-type="doi">10.15446/acag.v66n3.53451</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Temperatures and qualities of light in Niger ( Guizotia abyssinica (L.f.) Cass.) seeds germination in Mato Grosso do Sul, Brazil]]></article-title>
<article-title xml:lang="es"><![CDATA[Temperaturas y cualidades de luz en la germinación de semillas de Níger ( Guizotia abyssinica (L.f.) Cass.) en Mato Grosso do Sul, Brasil]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baptista Gordin]]></surname>
<given-names><![CDATA[Carla Regina]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintão Scalon]]></surname>
<given-names><![CDATA[Silvana de Paula]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal da Grande Dourados  ]]></institution>
<addr-line><![CDATA[Mato Grosso do Sul ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>66</volume>
<numero>3</numero>
<fpage>403</fpage>
<lpage>407</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122017000300403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122017000300403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122017000300403&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract For each vegetable species, there is a specific environment conditions to occur the seed germination process. However, there is a little information regarding the necessary conditions for Niger (Guizotia abyssinica (L.f.) Cass.) seeds germination. The aim of this research was to evaluate the influence of different temperatures and types of light on Niger (Guizotia abyssinica (L.f.) Cass.) seeds germination. Seeds were sown on two sheets of "germitest" paper inside plastic box type "gerbox" and placed on B.O.D. Treatments were constituted of two constant temperatures (15 ºC and 25 ºC, respectively) and an alternating temperature (20-30 ºC) under 10 hours for the lowest temperature and 14 hours for the highest temperature and they were associated to the wavelengths as follows: blue (440 nm), green (560 nm), red (660 nm), extreme red (730 nm), white light and dark. The experiment was conducted in a completely randomized design with four replicates of 50 seeds. Effects of different temperatures and qualities of light were evaluated by seeds germination and vigor. Higher germination of Niger seeds is observed in temperatures of 25 and 20-30 ºC and they can be considered as non-photoblastic.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para cada especie vegetal, hay un entorno específico para que se produzca el proceso de germinación de las semillas. Sin embargo, hay poca información sobre las condiciones necesarias para la germinación de las semillas de Níger (Guizotia abyssinica (L.f.) Cass.). El objetivo de esta investigación fue evaluar la influencia de diferentes temperaturas y tipos de luz sobre la germinación de semillas de Níger (Guizotia abyssinica (L.f.) Cass.). Las semillas se sembraron en dos hojas de papel "germinado" dentro de la caja de plástico tipo "gerbox" y se colocaron en B.O.D. Los tratamientos fueron constituidos por dos temperaturas constantes (15 ºC y 25 ºC, respectivamente) y una temperatura alterna (20-30 ºC) por debajo de 10 horas para la temperatura más baja y 14 horas para la temperatura más alta y se asociaron a las longitudes de onda como sigue: azul (440 nm), verde (560 nm), rojo (660 nm), rojo extremo (730 nm), luz blanca y oscuridad. El experimento fue conducido bajo un diseño completamente al azar con cuatro repeticiones de 50 semillas. Los efectos de las diferentes temperaturas y cualidades de luz, fueron evaluados por germinación y vigor de las semillas. La germinación más alta de las semillas de Níger se observa en temperaturas de 25 y 20-30 ºC y pueden considerarse como no fotoblásticas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Environment conditions]]></kwd>
<kwd lng="en"><![CDATA[germination test]]></kwd>
<kwd lng="en"><![CDATA[non-photoblastic]]></kwd>
<kwd lng="en"><![CDATA[oilseed crop]]></kwd>
<kwd lng="en"><![CDATA[wavelengths]]></kwd>
<kwd lng="es"><![CDATA[Condiciones ambientales]]></kwd>
<kwd lng="es"><![CDATA[longitudes de onda]]></kwd>
<kwd lng="es"><![CDATA[no fotoblástico]]></kwd>
<kwd lng="es"><![CDATA[oleaginosas]]></kwd>
<kwd lng="es"><![CDATA[pruebas de germinación]]></kwd>
</kwd-group>
</article-meta>
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