<?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>S2007-42982020000200348</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2445</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Conyza sumatrensis allelopathy effect on Bidens pilosa (Asteraceae) seed germination]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto alelopático de Conyza sumatrensis sobre la germinación de semillas de Bidens pilosa (Asteraceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira]]></surname>
<given-names><![CDATA[Paulo José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zonetti]]></surname>
<given-names><![CDATA[Patrícia da Costa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Albrecht]]></surname>
<given-names><![CDATA[Alfredo Junior Paiola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosset]]></surname>
<given-names><![CDATA[Isac George]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[André Felipe Moreira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Albrecht]]></surname>
<given-names><![CDATA[Leandro Paiola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vieira]]></surname>
<given-names><![CDATA[Amanda Holz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paulert]]></surname>
<given-names><![CDATA[Roberta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Paraná  ]]></institution>
<addr-line><![CDATA[Palotina Paraná]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>98</volume>
<numero>2</numero>
<fpage>348</fpage>
<lpage>354</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982020000200348&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982020000200348&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982020000200348&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Other tools for weed management should be considered in addition to the use of herbicides. In this context, the identification and use of allelopathic compounds deserves attention.  Question:  To quantify phenolic compounds and evaluate the allelopathic potential of extracts of Conyza sumatrensis on the germination of Bidens pilosa.  Studied species: Conyza sumatrensis (Retz.) E.Walker, Bidens pilosa L. (Asteraceae)  Study site:  Palotina, state of Paraná, Brazil.  Methods:  The aqueous extracts were prepared with shoot and root portions of C. sumatrensis in concentrations: 0, 1, 5 and 10 %. Germination and germination speed index were evaluated. The total flavonoids and phenols of the tested extracts were also quantified.  Results:  With increasing concentrations of the extracts there was an increased inhibition of germination of B. pilosa and delays in the germination process. The extracts from the shoot of C. sumatrensis had a more expressive effect on seed germination when compared to the extracts obtained from the root. At concentration of 10 %, the extract from the shoot reduced in 83 % the percentage of germination. This may be related to the higher concentration of total flavonoids and phenols found.  Conclusion:  The allelopathic potential of C. sumatrensis plants can be considered since both shoot and root extracts inhibited and/or reduced the germination of B. pilosa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Se deben considerar otras herramientas para el manejo de malezas además del uso de herbicidas. En este contexto, la identificación y el uso de compuestos alelopáticos merece atención.  Problema:  Cuantificar compuestos fenólicos y evaluar el potencial alelopático de extractos de Conyza sumatrensis en la germinación de Bidens pilosa.  Especies de estudio: Conyza sumatrensis (Retz.) E.Walker, Bidens pilosa L. (Asteraceae)  Sitio de estudio:  Palotina, estado de Paraná, Brasil.  Métodos:  Los extractos acuosos se prepararon con porciones de brotes y raíces de C. sumatrensis en concentraciones: 0, 1, 5 y 10 %. Se evaluaron la germinación y el índice de velocidad de germinación. También se cuantificaron los flavonoides y fenoles totales de los extractos probados.  Resultados:  Con el aumento de las concentraciones de los extractos hubo una mayor inhibición de la germinación de B. pilosa y retrasos en el proceso de germinación. Los extractos del brote de C. sumatrensis tuvieron un efecto más expresivo sobre la germinación de las semillas en comparación con los extractos obtenidos de la raíz. En la concentración de 10 %, el extracto del brote redujo en 83 % el porcentaje de germinación. Esto puede estar relacionado con la mayor concentración de flavonoides y fenoles totales encontrados.  Conclusión:  El potencial alelopático de las plantas de C. sumatrensis puede considerarse ya que tanto los extractos de brotes como los de raíz inhibieron y/o redujeron la germinación de B. pilosa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Flavonoids]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[interference]]></kwd>
<kwd lng="en"><![CDATA[total phenol]]></kwd>
<kwd lng="en"><![CDATA[weed]]></kwd>
<kwd lng="es"><![CDATA[Fenol total]]></kwd>
<kwd lng="es"><![CDATA[flavonoides]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[interferencia]]></kwd>
<kwd lng="es"><![CDATA[maleza]]></kwd>
</kwd-group>
</article-meta>
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