<?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>S1405-31952016000801065</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Calidad de la luz led y desarrollo in vitro de Oncidium tigrinum y Laelia autumnalis (orchidaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Led light quality and in vitro development of Oncidium tigrinum and Laelia autumnalis (orchidaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo-Talavera]]></surname>
<given-names><![CDATA[Martha M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedraza-Santos]]></surname>
<given-names><![CDATA[Martha E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Rangel]]></surname>
<given-names><![CDATA[Nicolás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Mendoza]]></surname>
<given-names><![CDATA[María de las N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lobit]]></surname>
<given-names><![CDATA[Philippe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Palacios]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo  ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Puebla Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo Texcoco]]></addr-line>
<country>Estado de México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>8</numero>
<fpage>1065</fpage>
<lpage>1080</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952016000801065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952016000801065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952016000801065&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La calidad, intensidad y duración de la luz afectan el desarrollo vegetal porque promueven diferentes respuestas fisiológicas. El objetivo de esta investigación fue evaluar la influencia de distintos espectros de iluminación sobre el desarrollo in vitro de Oncidium tigrinum La Llave y Lex. y Laelia autumnalis (Lex.) Lindl. Plántulas de tres meses de edad se cultivaron en medio Murashige y Skoog sin fitohormonas más tiamina (0.4 mg L-1), inositol (100 mg L-1), sacarosa (30 g L-1), agar (6 g L-1) con pH de 5.7. El diseño experimental fue completamente al azar y la unidad experimental consistió de 30 plántulas. Los tratamientos fueron LEDs rojo y azul en proporción 3:1, 2:2 y 1:3, LEDs blancos y luz blanca fluorescente (testigo), con seis repeticiones por tratamiento. Las longitudes de onda fueron: rojo de 590 a 670 nm, azul de 430 a 480 nm y blanca de 400 a 700 nm; el flujo de fotones fotosintéticos se ajustó a 31±2 µmol m-2 s-1. Las variables evaluadas fueron longitud de plántula y raíces, número de hojas y raíces, materia fresca y seca, y contenido de clorofila a, b y total. Con los datos se realizó un ANDEVA y las medias se compararon con la prueba de Tukey (p(0.05). Los resultados mostraron que la iluminación con LEDs blancos fue similar a la iluminación con luz fluorescente en el desarrollo in vitro de plántulas de L. autumnalis con valores del doble o más de clorofila a, b y total, y hasta 2 % más acumulación de biomasa, en comparación con los demás tratamientos. En O. tigrinum la luz LED blanca indujo el desarrollo de plantas vigorosas color verde intenso, sin daño por fotoxidación. Esto confirma que los LEDs son una alternativa eficaz para el crecimiento y desarrollo in vitro de plántulas de O. tigrinum y L. autumnalis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Quality, intensity and duration of light affect plant development because they promote different physiological responses. The aim of this study was to evaluate the influence of different lighting spectra on in vitro development of Oncidium tigrinum La Llave and Lex. and Laelia autumnalis (Lex.) Lindl. Three-month-old seedlings were grown in a Murashige and Skoog medium without plant hormones plus thiamine (0.4 mg L-1), inositol (100 mg L-1), saccharose (30 g L-1), and agar (6 g L-1) with pH of 5.7. The experimental design was completely randomized and the experimental unit consisted of 30 seedlings. Treatments were red and blue LEDs in a 3:1, 2:2, and 1:3 ratios, white LEDs and fluorescent white light (control), with six repetitions per treatment. Wave lengths were: 590-670 nm for red, 430-480 nm for blue, and 400-700 nm for white; photosynthetically active radiation was adjusted to 31±2 µmol m-2 s-1. The dependent variables were seedling and root length, number of leaves and roots, fresh and dry matter, and a, b and total chlorophyll content. An ANOVA was performed with this data and means were compared with a Tukey test (p(0.05). Results showed that white LED lighting was similar to fluorescent lighting in terms of in vitro seedlings development of L. autumnalis. Seedlings showed twice as much a, b, and total chlorophyll and up to 2 % more biomass accumulation compared with the other treatments. For O. tigrinum, white LED light induced the development of vigorous bright green plants with no photooxidation damage. LEDs lights were confirmed as an effective alternative for in vitro seedling growth and development of O. tigrinum and L. autumnalis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Laelia autumnalis]]></kwd>
<kwd lng="es"><![CDATA[Oncidium tigrinum]]></kwd>
<kwd lng="es"><![CDATA[desarrollo in vitro]]></kwd>
<kwd lng="es"><![CDATA[irradiación dirigida in vitro]]></kwd>
<kwd lng="es"><![CDATA[LEDs]]></kwd>
<kwd lng="en"><![CDATA[Laelia autumnalis]]></kwd>
<kwd lng="en"><![CDATA[Oncidium tigrinum]]></kwd>
<kwd lng="en"><![CDATA[in vitro development]]></kwd>
<kwd lng="en"><![CDATA[in vitro directed radiation]]></kwd>
<kwd lng="en"><![CDATA[LEDs]]></kwd>
</kwd-group>
</article-meta>
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