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- Title
Non-enzymatic conjugation of fenoxaprop-ethyl with glutathione and cysteine in several grass species.
- Authors
Tal, J. A.; Hall, J. C.; Stephenson, G. R.
- Abstract
Laboratory studies have shown that the amounts of glutathione (GSH) and cysteine are higher in grass species that are moderately tolerant, such as wheat (Triticum aestivum L.,cv. Fredrick), and moderately susceptible, such as barley (Hordeum vulgare L., cv. Legér) and triticale (cv. OAC Trillium), to fenoxaprop-ethyl (FE) than in species that are very susceptible to the herbicide, such as oat (Avena sativa L., cv. OAC Woodstock), wild oat (Avena fatim L.), yellow foxtail (Setaria glatica (L.) Beauv.), large crabgrass (Digitaria sangitinalis (L.) Scop.) and barnyard grass (Echinochloa crus-galli (L.) P.B.). The safener, fenchlorazole-ethyl (FCE) was found to increase and decrease, respectively, the amounts of GSH and cysteine in the moderately tolerant and moderately susceptible species but had no effect on the susceptible species. It is suggested that in the moderately tolerant and moderately susceptible species, especially following FCE treatment, more GSH is available to detoxify the herbicide. Glutathione-5-tranferase activity (GST) for FE was found to be very low in all of the species tested. In vitro experiments at physio-logical pH, demonstrated that FE may conjugate with GSH nonenzymatically. Therefore, it is suggested that nonenzymatic conjugation of fenoxaprop-ethyl with glutathione may be an important mechanism for tolerance of some grasses to this herbicide.
- Subjects
GLUTATHIONE; CYSTEINE proteinases; GRASSES; OLIGOPEPTIDES; GLUTATHIONE transferase; AMINO acids; HERBICIDES
- Publication
Weed Research, 1995, Vol 35, Issue 3, p133
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1995.tb02026.x