%0 Journal Article
%T Mefenpyr-diethyl action on fenoxaprop-p-ethyl detoxification in wheat varieties A  o de mefenpyr-diethyl sobre a desintoxica  o de fenoxaprop-¡äp-ethyl em variedades de trigo
%A A.C. Cataneo
%A L.C. Ferreira
%A M.M. Mischan
%A E.D. Velini
%J Planta Daninha
%D 2013
%I Sociedade Brasileira da Ci¨ºncia das Plantas Daninhas
%X Safeners protect crops against herbicide injury. The aim of this study was to examine the differential susceptibility of five wheat (Triticum aestivum) varieties to the herbicide fenoxaprop-p-ethyl, as well as the performance of mefenpyr-diethyl on minimizing herbicide injury and on lipid contents. Varieties BRS 49, CD 104, CEP 24, IAPAR 78 and Rubi were sprayed with fenoxaprop-p-ethyl (69 g ha1), fenoxaprop-p-ethyl + mefenpyr-diethyl (69 g + 18.75 g ha-1), or mefenpyr-diethyl (18.75 g ha-1). Plants were evaluated visually for injury at 7 and 14 days after treatment (DAT). Glutathione S-transferase (GST) activity was assayed in aerial parts at 7 DAT, and lipid content was measured at 14 DAT. Varieties CEP 24, IAPAR 78 and Rubi were more tolerant to fenoxaprop-p-ethyl than BRS 49, and CD 104 rapidly recovering from the slight phytotoxicity symptoms produced by the herbicide. Mefenpyr-diethyl prevented crop injury associated with the herbicide. GST activity did not correlate directly with fenoxaprop-p-ethyl detoxification. However, lipid content was related to the susceptibility of wheat to fenoxaprop-p-ethyl treatment. Protetores ou safeners protegem culturas contra a inj¨²ria de herbicidas. O prop¨®sito deste estudo foi investigar a suscetibilidade diferencial de cinco variedades de trigo (Triticum aestivum) ao herbicida fenoxaprop-p-ethyl e o efeito do protetor mefenpyr-diethyl na minimiza  o da inj¨²ria do herbicida e sobre o conte¨²do de lip¨ªdios. As variedades BRS 49, CD 104, CEP 24, IAPAR 78 e Rubi foram pulverizadas com fenoxaprop-p-ethyl (69 g ha-1), fenoxaprop-p-ethyl + mefenpyr diethyl (69 g + 18,75 g ha1) ou mefenpyr-diethyl (18,75 g ha1). A inj¨²ria das plantas foi avaliada visualmente aos 7 e 14 dias ap¨®s o tratamento (DAT). A atividade da glutationa S-transferase (GST) foi analisada na parte a¨¦rea aos 7 DAT, e o conte¨²do de lip¨ªdios, aos 14 DAT. As variedades CEP 24, IAPAR 78 e Rubi foram mais tolerantes ao fenoxaprop-p-ethyl do que a BRS 49, e a variedade CD 104 rapidamente se recuperou dos sintomas de intoxica  o produzidos pelo herbicida. Mefenpyr-diethyl preveniu a inj¨²ria da cultura pelo herbicida. A atividade da GST n o foi correlacionada diretamente com a desintoxica  o do fenoxaprop-p-ethyl. Contudo, o conte¨²do de lip¨ªdios esteve relacionado ¨¤ suscetibilidade de trigo ao tratamento de fenoxaprop-p-ethyl.
%K safener
%K Triticum aestivum
%K seletividade
%K glutationa S-transferase
%K conte¨²do de lip¨ªdios
%K safener
%K Triticum aestivum
%K selectivity
%K glutathione S-transferase
%K lipid content
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200016