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Contribution of Side Chains to Karbutilate Mode of Action

Published online by Cambridge University Press:  12 June 2017

R. S. Hammerschlag
Affiliation:
Agr. Environ. Qual. Inst., Agr. Res. Serv., U.S. Dep. Agr., Beltsville, MD 20705
J. L. Hilton
Affiliation:
Agr. Environ. Qual. Inst., Agr. Res. Serv., U.S. Dep. Agr., Beltsville, MD 20705
P. G. Bartels
Affiliation:
Dep. of Agron., Univ. of Arizona, Tucson, AZ 85721
D. E. Moreland
Affiliation:
Southern Region, Agr. Res. Serv., U.S. Dep. Agr., Crop Sci. Dep., N.C. State Univ., Raleigh, NC 27607

Abstract

Inhibition of seedling growth and four assays for inhibition of photosynthesis were used to compare karbutilate [tert-butylcarbamic acid ester with 3-(m-hydroxyphenyl)-1,1-dimethylurea] with derivatives of karbutilate in which either the urea or carbamate side chain was missing. Karbutilate was a more potent, more presistent, and more specific inhibitor of photosynthesis than the phenylurea derivative fenuron (1,1-dimethyl-3-phenylurea) that would be formed by removal of the carbamate side chain. However, karbutilate did not exert the growth-inhibiting action observed for the alkyl carbamate derivative phenyl-N-tert-butylcarbamate, formed by removal of the urea side chain, which does not affect photosynthesis at concentrations below 10-3 M.

Type
Research Article
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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