Full TGIF Record # 25015
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1992.pdf#page=134
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Author(s):Hassan, Gul; Mueller-Warrant, George W.; Griffith, Stephen M.
Author Affiliation:Plant Physiologist, Crop and Soil Science Department, Oregon State University and National Forage Seed Production Research Center, USDA-ARS, OR
Title:Fenoxaprop tolerance among Italian ryegrass cultivars is due in part to difference in ACCase
Meeting Info.:Held March 10, 11, 12, 1992, Salt Lake Hilton, Salt Lake City, Utah
Source:Proceedings of the Western Society of Weed Science. Vol. 45, 1992, p. 123-127.
Publishing Information:Logan, UT: Plant Science Dept., Utah State University.
Keywords:TIC Keywords: Fenoxaprop-ethyl; Resistance; Growth stages; Lolium multiflorum
Abstract/Contents:"Diclofop, fenoxaprop, fluazifop, haloxyfop, and quizalofop are classified as aryloxyphenoxypropanoic acid herbicides, These herbicides have emerged as important tools for the control of poaceous weeds in dicotyledonous crops and have shown their worth in cereals and grass seed crops (1, 15). The herbicidal properties of aryloxyphenoxypropionates are similar to those of cyclohexane-1,3-diones like sethoxydim and clethodim. Both groups of compounds have been reported as the potent inhibitors (7, 10, 17, 18) of the enzyme acetyl-CoA carboxylase (ACCase), a biotin-containing high molecular weight multifunctional protein catalyzing the ATP-dependent carboxylation of acetyl-CoA to malonyl-CoA in various pathways including fatty acid synthesis pathway (23). ACCase catalyzes two partial reactions, viz. the carboxylation of the biotin prosthetic group and a transcarboxylase reaction which transfers the carboxyl group from biotin to acetyl-CoA to form malonyl-CoA. The mechanism is described as a two sit "ping pong" reaction (5, 6, 18). This enzyme has been reported to be the target site of the two groups of herbicides described above, which of course have diverse chemistries (17, 20, 25). The inhibition of this pathway causes an inhibition of thylakoid membrane formation, chloroplast multiplication and biogenesis, and finally cell division and membrane lipid biosynthesis (13, 14). Our greenhouse studies have shown about 6-fold differences in tolerance to fenoxaprop between the least and the most tolerant cultivars of Italian ryegras at the whole plant level. Tolerance was also observed to increase with plant age. The present studies were carried out to determine whether the differential whole plant tolerance of Italian ryegrass to fenoxaprop is the result of the behavior of ACCase."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hassan, G., G. W. Mueller-Warrant, and S. M. Griffith. 1992. Fenoxaprop tolerance among Italian ryegrass cultivars is due in part to difference in ACCase. Proc. West. Soc. Weed Sci. 45:p. 123-127.
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