<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982021000300573</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2789</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Physiological screening of ruderal weed biomonitors of atmospheric nitrogen deposition]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación fisiológica de malezas ruderales como biomonitores de depósito de nitrógeno atmosférico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[D. Nayeli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrera]]></surname>
<given-names><![CDATA[Erick de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,aff1  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Investigaciones en Ecosistemas y Sustentabilidad ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>99</volume>
<numero>3</numero>
<fpage>573</fpage>
<lpage>587</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982021000300573&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982021000300573&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982021000300573&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Plants take up various species of reactive nitrogen and their different physiological responses to the increase of nitrogen availability can be useful in biomonitoring.  Questions: Does atmospheric nitrogen deposition affect the physiology of ruderal weeds? Which species are most responsive to nitrogen deposition?  Studied species:  Eleven ruderal weeds.  Study site and dates:  Morelia, Michoacán, Mexico. 2019.  Methods:  Under scenarios of 10, 20, 40 and 80 kg N ha-1year-1, we quantified plant responses of biomass production, nitrate reductase activity, chlorophyll content, photosynthetic efficiency, &#948;15N, nitrogen and carbon content.  Results:  Total biomass production increased with the rate of nitrogen deposition for Bidens pilosa, Chloris gayana, Lepidium virginicum, and Pennisetum setaceum, as chlorophyll content in B. pilosa, C. gayana, and L. virginicum. In turn, the below- to above-ground biomass ratio decreased for B. pilosa and C. gayana, as photosynthetic efficiency in C. gayana, L. virginicum, and Chloris pycnothrix. Nitrate reductase activity was only affected in L. virginicumm, C. gayana, and T. officinale.  With the exception of C. pycnothrix, the nitrogen content increased, while the carbon augmented in C. gayana, C. pycnothrix, and P. setaceum. The C/N ratio was reduced in B. pilosa, C. gayana, Chloris virgata, P. setaceum, and T. officinale. The &#948;15N was increased in B. pilosa, C. gayana, C. virgata and P. setaceum.  Conclusions: Bidens pilosa, C. gayana, L. virginicum, and P. setaceum were the species with more affected variables to nitrogen deposition, which could be useful in the biomonitoring.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Las plantas asimilan formas reactivas de nitrógeno y sus respuestas fisiológicas al incremento en la disponibilidad de nitrógeno pueden ser de utilidad en el biomonitoreo.  Preguntas: ¿Cómo responde la fisiología de malezas ruderales al depósito de nitrógeno atmosférico? ¿Cuáles especies son sensibles al depósito de nitrógeno?  Especies de estudio:  Once malezas ruderales  Sitio y años de estudio:  Morelia, Michoacán, México. 2019.  Métodos:  Se cuantificó la producción de biomasa, actividad de la enzima nitrato reductasa, contenido de clorofila, eficiencia fotosintética, &#948;15N, contenidos de N y C bajo escenarios de 10, 20, 40 y 80 kg N ha-1año-1:  Resultados:  La biomasa total incrementó con el depósito de nitrógeno en Bidens pilosa, Chloris gayana, Lepidium virginicum y Pennisetum setaceum, al igual que la clorofila en B. pilosa, C. gayana y L. virginicum. La relación biomasa subterránea/aérea se redujo en B. pilosa y C. gayana, así como la eficiencia fotosintética en C. gayana, L. virginicum y Chloris pycnothrix. La actividad de la enzima nitrato reductasa se afectó en L. virginicum, C. gayana y Taraxacum officinale.  A excepción de C. pycnothrix, el contenido de nitrógeno aumentó, mientras el carbono incrementó en C. gayana, C. pycnothrix y P. setaceum. La relación C/N se redujo en B. pilosa, C. gayana, Chloris virgata, P. setaceum y T. officinale. El &#948;15N se incrementó en B. pilosa, C. gayana, C. virgata y P. setaceum.  Conclusiones: Bidens pilosa, C. gayana, L. virginicum y P. setaceum, las especies con más variables afectadas por el depósito de nitrógeno, podrían ser útiles en el biomonitoreo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Atmospheric pollution]]></kwd>
<kwd lng="en"><![CDATA[biomass]]></kwd>
<kwd lng="en"><![CDATA[chlorophyll]]></kwd>
<kwd lng="en"><![CDATA[nitrate reductase]]></kwd>
<kwd lng="en"><![CDATA[plant nutrition]]></kwd>
<kwd lng="en"><![CDATA[stable isotopes]]></kwd>
<kwd lng="es"><![CDATA[Biomasa]]></kwd>
<kwd lng="es"><![CDATA[clorofila]]></kwd>
<kwd lng="es"><![CDATA[contaminación atmosférica]]></kwd>
<kwd lng="es"><![CDATA[isótopos estables]]></kwd>
<kwd lng="es"><![CDATA[nitrato reductasa]]></kwd>
<kwd lng="es"><![CDATA[nutrición vegetal]]></kwd>
</kwd-group>
</article-meta>
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