<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682020000200097</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.50.7</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Crecimiento de Limnobium laevigatum (Hydrocharitaceae) bajo cuatro proporciones diferentes de NO 3 -: NH 4 + en condiciones de laboratorio]]></article-title>
<article-title xml:lang="en"><![CDATA[Growth of Limnobium laevigatum (Hydrocharitaceae) under four different NO 3 -: NH 4 + proportions under laboratory conditions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Cuellar]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aponte]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Científica del Sur Facultad de Ciencias Veterinarias y Biológicas ]]></institution>
<addr-line><![CDATA[Villa El Salvador ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Científica del Sur Facultad de Ciencias Veterinarias y Biológicas ]]></institution>
<addr-line><![CDATA[Jesús María ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<numero>50</numero>
<fpage>97</fpage>
<lpage>107</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682020000200097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682020000200097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682020000200097&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Limnobium laevigatum es una planta acuática flotante con un gran potencial para su uso como forraje y como planta captadora de carbono. A fin de optimizar su crecimiento es fundamental conocer las condiciones de cultivo óptimas para su propagación, siendo uno de estos parámetros la proporción de NO3 -:NH4 +. El objetivo del presente artículo fue el de evaluar el crecimiento de Limnobium laevigatum probando cuatro diferentes proporciones de NO3 -:NH4 + bajo condiciones de laboratorio. El experimento tuvo una duración de 28 días en las que las plantas fueron sometidas a cuatro tratamientos con diferentes proporciones de NO3 -:NH4 + (6:1, 3:1, 1:1, 1:3). Se analizaron parámetros de crecimiento como la longitud de la raíz, número de hojas, número de rametos, área foliar, peso húmedo, peso seco, tasa de crecimiento relativo (TCR), porcentaje de clorosis y porcentaje de hojas muertas. Los resultados nos indican que el tratamiento con mayor cantidad de nitratos (6:1) fue el que presentó la mayor longitud de raíz, número de hojas, rametos, área foliar, peso húmedo, peso seco y TCR. El tratamiento con mayor cantidad de amonio (1:3) tuvo mayor porcentaje de clorosis y hojas muertas. Se discuten las razones por las que los tratamientos con más amonio tuvieron menor rendimiento, entre las que se encuentran los cambios negativos en el funcionamiento enzimático ocasionados por esta molécula.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Limnobium laevigatum is a floating aquatic plant with great potential for use as forage and as a carbon capture plant. In order to optimize its growth, it is essential to know the optimal culture conditions for its propagation, being one of these parameters the proportion of NO3 -:NH4 +. The aim of this article was to evaluate the growth of Limnobium laevigatum by testing four different NO3 -:NH4 + proportions under laboratory conditions. The experiment lasted 28 days in which the plants were subjected to four treatments with different NO3 -:NH4 + proportions (6:1, 3:1, 1:1, 1:3). Growth parameters were analyzed, such as root length, number of leaves, number of ramets, leaf area, wet weight, dry weight, relative growth rate (TCR), percentage of chlorosis and percentage of dead leaves. The results indicate that the treatment with the highest amount of nitrates (6:1) was the one with the greatest length of root, number of leaves, ramets, foliar area, wet weight, dry weight and TCR. The treatment with the highest amount of ammonium (1:3) had a higher percentage of chlorosis and dead leaves. The reasons why the treatments with more ammonium had lower performance are discussed, among which the negative changes in the enzymatic functioning are caused by this molecule.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Influencia del nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[amonio]]></kwd>
<kwd lng="es"><![CDATA[nitrato]]></kwd>
<kwd lng="es"><![CDATA[condiciones de cultivo]]></kwd>
<kwd lng="es"><![CDATA[propagación]]></kwd>
<kwd lng="en"><![CDATA[Influence of nitrogen]]></kwd>
<kwd lng="en"><![CDATA[ammonium]]></kwd>
<kwd lng="en"><![CDATA[nitrate]]></kwd>
<kwd lng="en"><![CDATA[growing conditions]]></kwd>
<kwd lng="en"><![CDATA[propagation]]></kwd>
</kwd-group>
</article-meta>
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