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Effects of Diclofop and Haloxyfop on Lipid Synthesis in Corn (Zea mays) and Bean (Phaseolus vulgaris)

Published online by Cambridge University Press:  12 June 2017

Laura D. Boldt  and
Michael Barrett
Laura D. Boldt
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546-0091
Michael Barrett
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546-0091
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Abstract

Diclofop–methyl and haloxyfop–methyl (0.001 to 10 μM) 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 μM). 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.

Keywords

Diclofop-methyl, methyl ester of (±)–2–[4–(2,4–dichlorophenoxy)phenoxy]propanoic aciddiclofop acid, (±)–2–[4–(2,4-dichlorophenoxy)phenoxy]propanoic acidhaloxyfop-methyl, methyl ester of 2–[4–[[3–chloro–5–(trifluoromethyl)–2–pyridinyl]oxy]phenoxy]propanoic acidhaloxyfop acid, 2–[4–[[3–chloro–5–(trifluoromethyl)–2–pyridinyl]oxy]phenoxy]propanoic acidcorn, Zea mays L. ‘B73 × Mo17’bean, Phaseolus vulgaris L. ‘Contender’Postemergence grass herbicidemode of actionacetyl-coenzyme A carboxylase
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 39 , Issue 2 , June 1991 , pp. 143 - 148
Copyright
Copyright © 1991 Weed Science Society of America 

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References

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