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      Resposta de biótipos de Euphorbia heterophylla a doses de glyphosate Translated title: Response of Euphorbia heterophylla biotypes to glyphosate rates

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          Abstract

          A leiteira (Euphorbia heterophylla) é uma planta daninha de ciclo anual encontrada com frequência em lavouras de soja na região Sul do Brasil, controlada em lavouras de soja geneticamente modificada (Roundup Ready® - RR) com uso do herbicida glyphosate. Entretanto, nos últimos anos, o controle dessa espécie não tem sido satisfatório em alguns locais, provocando a suspeita de que foram selecionados biótipos resistentes ao herbicida. Diante disso, o objetivo deste trabalho foi avaliar, por meio de curvas de dose-resposta, biótipos de leiteira com suspeita de resistência ao glyphosate. O experimento foi realizado em casa de vegetação, em delineamento experimental completamente casualizado, com quatro repetições. Os tratamentos constituíram-se de doses crescentes de glyphosate (0, 90, 180, 360, 720, 1.080, 1.440 e 2.160 g e.a. ha-1), aplicadas sobre cinco biótipos de leiteira, oriundos de lavouras de soja RR do Estado do Rio Grande do Sul. As variáveis avaliadas foram controle e matéria seca da parte aérea. Os resultados evidenciam que os biótipos de leiteira avaliados são suscetíveis ao glyphosate.

          Translated abstract

          Wild poinsettia is an annual cycle weed, commonly found in soybean crop in southern Brazil. It is controlled by glyphosate in genetically- modified soybean (Roundup Ready® - RR). The control of this species has not proven to be satisfactory in some places in the last years, leading to the suspicion that biotypes resistant to glyphosate have been selected. The objective this work was to evaluate, by response-dose curve, wild poinsettia biotypes with suspected resistance to glyphosate. The experiment was conducted under greenhouse conditions and the experiment was arranged in a randomized complete block design, with four replications. The treatments consisted of increased application rates of glyphosate (0, 90, 180, 360, 720, 1,080, 1,440 and 2,160 g a.e. ha-1) on five wild poinsettia biotypes, from crop soybean RR in the state of Rio Grande do Sul. Control and dry weight were evaluated. The results indicated that the wild poinsettia biotypes are susceptible to glyphosate.

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          Most cited references21

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          An integrated system of classification of flowering plant

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                pd
                Planta Daninha
                Planta daninha
                Sociedade Brasileira da Ciência das Plantas Daninhas (Viçosa )
                1806-9681
                2011
                : 29
                : spe
                : 1121-1128
                Affiliations
                [1 ] Embrapa Trigo Brazil
                [2 ] Universidade Federal de Pelotas Brazil
                [3 ] Universidade Federal de Pelotas Brazil
                [4 ] Universidade Federal de Pelotas Brazil
                [5 ] Fundacep
                [6 ] Universidade Federal de Pelotas Brazil
                [7 ] Dupont do Brasil Brazil
                [8 ] Associação Brasileira de Ação a Resistência de Plantas aos Herbicidas
                Article
                S0100-83582011000500020
                10.1590/S0100-83582011000500020
                b9e85ef2-38a5-4d7d-8bcb-5858bbfea9fc

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-8358&lng=en
                Categories
                PLANT SCIENCES

                Plant science & Botany
                Glycine max,chemical control,weed,tolerance,controle químico,planta daninha,tolerância

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