Effects of diclofop and haloxyfop on lipid synthesis in corn (Zea mays) and bean (Phaseolus vulgaris)
1991
Boldt, L.D. | Barrett, M.
Diclofop-methyl and haloxyfop-methyl (0.001 to 10 micromoles) caused 9 to 61% inhibition of 14C-acetate incorporation into lipids in corn leaf segments within 1 h of herbicide treatment, while neither herbicide affected this process in bean leaf segments. The herbicides did not affect 14C-malonate incorporation into lipids in corn leaf segments. Diclofop-methyl and haloxyfop-methyl reduced 14C-acetate incorporation into polar lipids and triglycerides in corn while incorporation into sterols was increased. In vitro activity of acetyl-coenzyme A carboxylase (EC 6.4.1.2) was inhibited from 26 to 94% within 5 min of exposure to the herbicides (1 to 10 micromoles). Diclofop acid inhibited this enzyme activity more than did haloxyfop acid. Differences in field activity between diclofop-methyl and haloxyfop-methyl are not related to differential sensitivity of acetyl-coenzyme A carboxylase to the two herbicides.
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