Mefenpyr-diethyl action on fenoxaprop-p-ethyl detoxification in wheat varieties

Abstract

-Safeners protect crops against herbicide injury. The aim of this study was to examine the differential susceptibility of five wheat (Triticum aestivum) ). 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.Keywords: safener, Triticum aestivum, selectivity, glutathione S-transferase, lipid content.RESUMO -Protetores ou safeners protegem culturas contra a injúria de herbicidas. O propósito 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 minimização da injúria do herbicida e sobre o conteúdo de lipídios. 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 ha 1 ) ou mefenpyr-diethyl (18,75 g ha 1 ). A injúria das plantas foi avaliada visualmente aos 7 e 14 dias após o tratamento (DAT). A atividade da glutationa S-transferase (GST) foi analisada na parte aérea aos 7 DAT, e o conteúdo de lipídios, 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 intoxicação produzidos pelo herbicida. Mefenpyrdiethyl preveniu a injúria da cultura pelo herbicida. A atividade da GST não foi correlacionada diretamente com a desintoxicação do fenoxaprop-p-ethyl. Contudo, o conteúdo de lipídios esteve relacionado à suscetibilidade de trigo ao tratamento de fenoxaprop-p-ethyl.Palavras-chave: safener, Triticum aestivum, seletividade, glutationa S-transferase, conteúdo de lipídios.CATANEO, A.C. et al.

Selectivity of Herbicide Associations with Chemical Protector in the Treatment of Sweet Sorghum Hybrid Seeds

“…So far, the accepted hypothesis is that protectors activate the metabolic mechanisms of plants (Galon et al, 2011), acting over the already known detoxification tracts, such as enzymes from the P450 cytochrome complex and reactions from the connection with glutathione S-transferase (GST) and glucosyltransferase (Cataneo et al, 2013). For sorghum culture, one of the mechanisms that naturally give selectivity to HPPD inhibitor herbicides is metabolism.…”

“…Safeners protect cultivated species from the herbicide action, avoiding injuries that may harm emergence or stand, as well as culture development itself (Alterman and Jones, 2003), since they normally present high specificity level (Cataneo et al, 2013).…”

Selectivity of Iodosulfuron-Methyl Association with ACCase Inhibitors and 2.4-D in Wheat and Barley Crops

“…Recently, the combination of iodosulfuron-methyl + fenoxaprop-p-ethyl herbicides in the tank has been used empirically by farmers from Rio Grande do Sul and Paraná as a management option with a single application of difficult-to-control Magnoliopsida and Liliopsida species, such as ryegrass and black oats. Such a tank mix is only feasible for some winter crops due to the safener (chemical protection) present in the formulation of iodosulfuron-methyl, called mefenpyr-diethyl (Cataneo et al, 2013), which is capable of protecting the crop Wheat from the deleterious and phytotoxic effects of fenoxaprop-p-ethyl. These substances can be applied separately, for example in the treatment of seeds of the crops in question, or even be used directly in the formulation of some herbicides (Abu-Qare and Duncan, 2002;Galon et al, 2011).…”

The safener effect of chiral derivatives of 3-dichloroacetyl oxazolidine against haloxyfop-P-methyl-induced toxicity in maize

“…Nevertheless intensive research has been conducted in recent years; the exact mechanism of safener is incompletely understood (Hull et al, 2008). Research on safeners previously focused on the structure-activity relationship of safener and the actions of safener on the detoxification process of herbicide in plants (Fu et al, 2012;Cataneo et al, 2013). It is generally believed that safeners enhance the expression of plant defense and detoxification genes such as glutathione S-transferases (GST), cytochrome P450, and endogenous glutathione (GSH) involved in exogenous compounds metabolism (Matola, Jablonkai, 2007;Del Buono, Ioli, 2011).…”