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Mode of Action of Substituted Uracil Herbicides

Published online by Cambridge University Press:  12 June 2017

J. L. Hilton ,
T. J. Monaco ,
D. E. Moreland  and
W. A. Gentner
J. L. Hilton
Affiliation:
Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland
T. J. Monaco
Affiliation:
Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Crop Science Department, North Carolina State College, Raleigh, North Carolina
D. E. Moreland
Affiliation:
Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Crop Science Department, North Carolina State College, Raleigh, North Carolina
W. A. Gentner
Affiliation:
Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland
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Abstract

Results of studies with microorganisms suggest that 5-bromo-3-isopropyl-6-methyluracil (isocil) does not interfere appreciably with pyrimidine metabolism. Instead the uracil herbicides studied appear to act in higher plants as inhibitors of photosynthesis. Strong inhibition of the Hill reaction of isolated chloroplasts by substituted uracils was noted (I50 of 2.7 × 10−6 M for isocil). Exogenously supplied carbohydrates partially nullified toxicity symptoms in intact barley plants growing in the presence of inhibitory concentrations of isocil.

Type
Research Article
Information
Weeds , Volume 12 , Issue 2 , April 1964 , pp. 129 - 131
Copyright
Copyright © 1964 Weed Science Society of America 

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References

Literature Cited

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