Full TGIF Record # 15200
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Stoltenberg, David E.; Gronwald, John W.; Wyse, Donald L.; Burton, James D.; Somers, David A.; Gengenbach, Burle G.
Author Affiliation:Dept. of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN.
Title:The Effect of Sethoxydim and Haloxyfop on Acetyl-Coenzyme A Carboxylase Activity in Tolerant and Susceptable Festuca Species.
Meeting Info.:Held: December 13-15, 1988, Minneapolis, MN.
Source:Proceedings of the North Central Weed Control Conference. Vol. 43, December 1988, p. 82.
Publishing Information:Omaha, NB: North Central Weed Control Conference
Keywords:TIC Keywords: Sethoxydim; Haloxyfop; Festuca; Resistance; Carboxylase
Abstract/Contents:"Previous research has shown that tall fescue is susceptable to sethoxydim while red fescue is tolerant. In greenhouse studies, the calculated I50 (the rate of herbicide application resulting in 50% inhibition of shoot growth) was 0.004 kg/ha for both sethoxydim and haloxyfop in tall fescue. In red fescue, the I50 for sethoxydim and haloxyfop was 9.4 kg/ha and 0.04 kg/ha, respectively. These results show that red fescue is 2350 and 10 times more tolerant to sethoxydim and haloxyfop, respectively, than tall fescue. Absorption and distribution of 14C was similar between red and tall fescue 24h following application of 14C-haloxyfop-methyl to 14-d-old etiolated seedlings. The percent of recovered radiolabel in the form of parent compound and free acid was similar between species. Tall fescue had a higher percent of polar metabolites than red fescue. These results suggest that metabolism of haloxyfop-methyl in red and tall fescue does not account for the differential tolerance demonstrated by these species. Studies with crude cell-free extracts from tall fescue showed that 10 uM sethoxydim and 10 uM haloxyfop inhibited 14C-acetyl-coenzyme A incorporation into fatty acids 62 and 71%, respectively. In red fescue, 10 uM haloxyfop inhibited 14C-acetyl-CoA incorporation into fatty acids 29%, whereas 10 uM sethoxydim had no effect. The I50 for inhibition of acetyl-coenzyme A carboxylase activity in tall fescue with sethoxydim and haloxyfop was 6.9 and 5.8 uM, respectively. In red fescue, the I50 for haloxyfop was 118 uM. Sethoxydim concentrations as high as 1 mM had little effect on acetyl-coenzyme A carboxylase activity in red fescue. These results suggest that acetyl-coenzyme A carboxylase in tall fescue is a sensitive site for sethoxydim and haloxyfop, and that tolerance to these herbicides in red fescue may be due to the presence of a more tolerant form of the enzyme."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Stoltenberg, D. E., J. W. Gronwald, D. L. Wyse, J. D. Burton, D. A. Somers, and B. G. Gengenbach. 1988. The Effect of Sethoxydim and Haloxyfop on Acetyl-Coenzyme A Carboxylase Activity in Tolerant and Susceptable Festuca Species.. Proc. North Cent. Weed Sci. Soc. 43:p. 82.
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