<?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>S0871-018X2008000100017</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Resistências cruzadas em biótipos de Alisma Plantago-Aquatica resistentes ao bensulfurão-metilo e suas consequências]]></article-title>
<article-title xml:lang="en"><![CDATA[Cross resistance in bensulfuron-methyl resistant Alisma Plantago-Aquatica biotypes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calha]]></surname>
<given-names><![CDATA[Isabel M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreira]]></surname>
<given-names><![CDATA[Ilídio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rocha]]></surname>
<given-names><![CDATA[Fátima]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional dos Recursos Biológicos  ]]></institution>
<addr-line><![CDATA[Oeiras ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade Técnica de Lisboa Instituto Superior de Agronomia ]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>173</fpage>
<lpage>193</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2008000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2008000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2008000100017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A aplicação repetida de bensulfurão-metilo em arrozais dos vales dos rios Sorraia, Sado e Mondego seleccionaram populações resistentes (R) de Alisma plantago-aquatica (Mo260, Sa88, So306 e So307). Determinou-se o nível de resistência (NR= ED50 R/ ED50 S) ao bensulfurão-metilo em plantas com 26 dias (6 filódios lineares) e com 42 dias (6 filódios expandidos) e a resistência cruzada a 14 herbicidas. Confirmou-se que quatro populações eram resistentes e uma (Mo190) era susceptível. Esta população provinha de um campo tratado com bensulfurão-metilo e bentazona anualmente. Os resultados dos ensaios de doseresposta confirmam a maior susceptibilidade ao bensulfurão-metilo, no estado fenológico 116. Apresentaram resistência cruzada a todos os herbicidas inibidores da ALS excepto ao metsulfurão-metilo e ao imazetapir. Obtiveram-se valores de NR de 3 a 315 para azimsulfurão, cinosulfurão e etoxisulfurão. Bentazona, MCPA, oxadiazão e propanil apresentaram NR próximos da unidade, indicando que herbicidas com diferente modo de acção mantiveram a sua eficácia e podem constituir alternativa no combate a populações de A. plantago-aquatica resistentes ao bensulfurão-metilo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The repetitive use of bensulfuron-methyl in rice fields from Sorraia, Sado and Mondego river valleys had selected resistant (R) populations of Alisma plantago-aquatica in Portugal, identified as So306, So307, Sa88, Mo190; Mo260, respectively. The response of R-biotypes to bensulfuron-methyl at 26 days after seeding (DAS) and 42 DAS and the crossresistance either to ALS- inhibitors or to herbicides with other mode of action, was investigated in dose-response experiments. The results confirmed bensulfuron-methyl resistance in four biotypes, but not in Mo190, which had been also treated with bentazon every year. Younger plants (6 linear phyllodium, BBCH 116) were more susceptible to bensulfuron-merthyl than were older plants (6 expanded phyllodium, BBCH 126). R-biotypes presented cross-resistance to all ALS-inhibitors studied except for imazethapyr and metsulfuron-methyl. Resistance indeces (RI= ED 50R /ED50 S) ranged frome 3 to 313 for the three sulfonylurea herbicides. Herbicides with different mode of action including bentazon, MCPA, oxadiazon and propanil showed resistance indices of one, indicating that all herbicides tested had equal activity to both Rand S-biotypes. It was concluded that these herbicides could be effective for the control of resistant A. plantago-aquatica biotypes in rice paddy fields.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[ensaios de dose-resposta]]></kwd>
<kwd lng="pt"><![CDATA[estado fenológico]]></kwd>
<kwd lng="pt"><![CDATA[sulfonilureias]]></kwd>
<kwd lng="en"><![CDATA[dose response bioassay]]></kwd>
<kwd lng="en"><![CDATA[growth stage]]></kwd>
<kwd lng="en"><![CDATA[sulfonylureas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="center">        <p><strong>Resistências cruzadas em biótipos de <em>Alisma Plantago-Aquatica</em>      resistentes ao bensulfurão-metilo e suas consequências</strong></p>       <p><strong>Cross resistance in bensulfuron-methyl resistant <em>Alisma Plantago-Aquatica</em>      biotypes</strong></p> </div>     <P align="center"> Isabel M. Calha<Sup><a href="#1">1</a><a name="top1"></a></Sup>,    Ilídio Moreira<Sup><a href="#2">2</a><a name="Top2" id="Top2"></a></Sup>, Fátima    Rocha<Sup><a href="#1">1</a><a name="top1" id="top1"></a> </Sup></P>     <P > RESUMO </P>     <P align="justify"> A aplicação repetida de bensulfurão-metilo em arrozais dos    vales dos rios Sorraia, Sado e Mondego seleccionaram populações resistentes    (R) de Alisma plantago-aquatica (Mo260, Sa88, So306 e So307). Determinou-se    o nível de resistência (NR= ED<Sub>50</Sub> R/ ED<Sub>50</Sub> S) ao bensulfurão-metilo    em plantas com 26 dias (6 filódios lineares) e com 42 dias (6 filódios expandidos)    e a resistência cruzada a 14 herbicidas. Confirmou-se que quatro populações    eram resistentes e uma (Mo190) era susceptível. Esta população provinha de um    campo tratado com bensulfurão-metilo e bentazona anualmente. Os resultados dos    ensaios de doseresposta confirmam a maior susceptibilidade ao bensulfurão-metilo,    no estado fenológico 116. Apresentaram resistência cruzada a todos os herbicidas    inibidores da ALS excepto ao metsulfurão-metilo e ao imazetapir. Obtiveram-se    valores de NR de 3 a 315 para azimsulfurão, cinosulfurão e etoxisulfurão. Bentazona,    MCPA, oxadiazão e propanil apresentaram NR próximos da unidade, indicando que    herbicidas com diferente modo de acção mantiveram a sua eficácia e podem constituir    alternativa no combate a populações de A. plantago-aquatica resistentes ao bensulfurão-metilo.  </P>     <P > <strong>Palavras-chave</strong>: ensaios de dose-resposta, estado fenológico,    sulfonilureias. </P>     <P >&nbsp;</P>     <P >ABSTRACT </P>     <P align="justify"> The repetitive use of bensulfuron-methyl in rice fields from    Sorraia, Sado and Mondego river valleys had selected resistant (R) populations    of Alisma plantago-aquatica in Portugal, identified as So306, So307, Sa88, Mo190;    Mo260, respectively. The response of R-biotypes to bensulfuron-methyl at 26    days after seeding (DAS) and 42 DAS and the crossresistance either to ALS- inhibitors    or to herbicides with other mode of action, was investigated in dose-response    experiments. The results confirmed bensulfuron-methyl resistance in four biotypes,    but not in Mo190, which had been also treated with bentazon every year. Younger    plants (6 linear phyllodium, BBCH 116) were more susceptible to bensulfuron-merthyl    than were older plants (6 expanded phyllodium, BBCH 126). R-biotypes presented    cross-resistance to all ALS-inhibitors studied except for imazethapyr and metsulfuron-methyl.    Resistance indeces (RI= ED <Sub>50</Sub>R /ED<Sub>50 </Sub>S) ranged frome 3    to 313 for the three sulfonylurea herbicides. Herbicides with different mode    of action including bentazon, MCPA, oxadiazon and propanil showed resistance    indices of one, indicating that all herbicides tested had equal activity to    both Rand S-biotypes. It was concluded that these herbicides could be effective    for the control of resistant A. plantago-aquatica biotypes in rice paddy fields.  </P>     ]]></body>
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<body><![CDATA[<P align="justify" > Viggiani, P.; Tabacchi, M. &amp; Angelini, R. (2003) -Vegetazione    Spontanea di Risaie e Canali. Ed. Informatori Agrário. Bayer Crop Science 375    pp. </P>     <P align="justify" > Wang, G.X.; Kohara, H. &amp; Itoh, K. (1997). Sulfonylurea    resistance in a biotype of Monochoria korsakowii; an annual paddy weed in Japan.    Proceedings Brighton Crop Protection Conference – Weeds. Brighton, UK, pp. 311-318.  </P>     <P align="justify" > Wang, G.X.; Watanabe, H.; Uchino, A. &amp; Itoh, K. (2000)    - Response to sulfonylurea (SU)-resistant biotype of Limnophila sessiliflora    to selected SU and alternative herbicides. Pesticide Biochemistry and Physiology    68: 59-66. </P>     <P align="justify" > Wrubel, R.P. &amp; Gressel, J. (1994) - Are herbicide mixtures    useful for delaying the rapid evolution of resistance? a case study. Weed Technology    8: 635-648. </P>     <P align="justify" >&nbsp;</P>     <P ><sup><a href="#top1">1</a><a name="1"></a></sup> Instituto Nacional dos Recursos    Biológicos </P>     <P > Quinta do Marquês </P>     <P > 2780-155 Oeiras, Portugal. </P>     <P > <a href="mailto:isamc@dgpc.min-agricultura.pt">isamc@dgpc.min-agricultura.pt</a>  </P>     <P ><sup><a href="#top2">2</a><a name="2"></a></sup> Instituto Superior de Agronomia/Universidade  </P>     ]]></body>
<body><![CDATA[<P > Técnica de Lisboa, Tapada da Ajuda, 1349-017, </P>     <P > Lisboa, Portugal. </P>     <P >Recepção/Reception: 2006.06.07 </P>     <P >Aceitação/Acception: 2007.07.22 </P>     <P >&nbsp;</P>      ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brown]]></surname>
<given-names><![CDATA[H.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Mode of action; crop selectivity and soil relations of the sulfonylurea herbicides]]></article-title>
<source><![CDATA[Pesticide Science]]></source>
<year>1990</year>
<volume>29</volume>
<page-range>263-281</page-range></nlm-citation>
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