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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 ,
J. L. Hilton ,
P. G. Bartels  and
D. E. Moreland
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
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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
Information
Weed Science , Volume 23 , Issue 5 , September 1975 , pp. 425 - 427
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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