<?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>0871-018X</journal-id>
<journal-title><![CDATA[Revista de Ciências Agrárias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. de Ciências Agrárias]]></abbrev-journal-title>
<issn>0871-018X</issn>
<publisher>
<publisher-name><![CDATA[Sociedade de Ciências Agrárias de Portugal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0871-018X2021000100021</article-id>
<article-id pub-id-type="doi">10.19084/rca.23478</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Ocorrência e caracterização de populações de bactérias nodulíferas fixadoras de N2 oriundas de áreas de assentamento em Marabá, Pará, Brasil]]></article-title>
<article-title xml:lang="en"><![CDATA[Occurrence and characterization of populations of nodule-inducing N2 from settlement areas in Marabá, Pará, Brasil]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira]]></surname>
<given-names><![CDATA[Linnajara de Vasconcelos Martins]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Aliane Medeiros]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reis]]></surname>
<given-names><![CDATA[Agamenon Azevedo dos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Federal de Educação Ciência e Tecnologia do Pará  ]]></institution>
<addr-line><![CDATA[Marabá Pará]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>1</numero>
<fpage>21</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2021000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2021000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2021000100021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo O estudo das populações nativas edáficas pode revelar um reservatório de recurso genético para a seleção de estirpes eficientes, além de constituir um indicador das intervenções antrópicas. O objetivo do trabalho foi caracterizar e avaliar a ocorrência de populações de bactérias que nodulam e fixam N2 utilizando o feijão caupi como planta isca. O estudo foi realizado em casa de vegetação do Instituto Federal do Pará, Campus Marabá Rural. As amostras de solo foram coletadas no Projeto de Assentamento 26 de Março em oito ambientes: três áreas individuais sob cultivo de banana e de mandioca, uma sob capoeira e uma sob floresta. O delineamento experimental foi inteiramente casualizado com três repetições e oito tratamentos sendo estes constituídos pelas áreas de estudos. Aos 35 dias após emergências, as plantas foram coletadas para determinação do número de nódulos (NN), massa seca da parte área (MSPA) e raiz (MSR). De cada tratamento realizou-se o isolamento de dez nódulos destinados a caracterização morfológica e fisiológica de suas colônias. A nodulação ocorreu em todos os tratamentos, apresentado uma grande variação de NN e produção de MSPA. Foram isoladas 53 estirpes demonstrando elevada diversidade cultural por meio das características morfológicas e fisiológicas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The native edaphic population study can be a reservoir of genetic resources for the selection of efficient strains, besides being an indicator of anthropogenic activities. The aim of this work was to characterize and evaluate the occurrence of bacterial populations that nodulate and fix N2 using cowpea as a bait plant. This study was carried out in a greenhouse situated at the Federal Institute of Pará, Campus Marabá Rural, Brasil. Soil samples were collected in the Settlement Project 26 de Março into eight environments: being three individual areas under banana and cassava cultivation, one under capoeira and one under forest. The experimental design was completely randomized with three replications and eight treatments, which consisted of the study areas. At 35 days after emergencies of the plants, they were collected to determine the number of nodules (NN), dry matter of the shoots (DMA) and root (DMR). From each treatment in this process, ten nodules were isolated for the morphological and physiological characterization of their colonies. Nodulation occurred in all treatments, with a large variation in NN and DMA production. Fifty-three strains were isolated demonstrating high cultural diversity through morphological and physiological characteristics.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[rizóbio]]></kwd>
<kwd lng="pt"><![CDATA[comunidades nativas]]></kwd>
<kwd lng="pt"><![CDATA[feijão caupi]]></kwd>
<kwd lng="pt"><![CDATA[manejo do solo]]></kwd>
<kwd lng="en"><![CDATA[rhizobia]]></kwd>
<kwd lng="en"><![CDATA[native communities]]></kwd>
<kwd lng="en"><![CDATA[cowpea]]></kwd>
<kwd lng="en"><![CDATA[soil management]]></kwd>
</kwd-group>
</article-meta>
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