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A Possible Mechanism of Action of the Urea Type Herbicides

Published online by Cambridge University Press:  12 June 2017

Anson R. Cooke
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Extract

The herbicide, 3–(p–chlorophenyl)–1,1–dimethylurea (CMU), first reported by Bucha and Todd (1), is finding increasing uses in the field of weed control. The mechanism of action of this compound, however, is as yet unknown. One of the early symptoms of CMU toxicity is a chlorosis (2) which develops in both monocotyledonous and dicotyledonous species. Muzik et al. (5) have shown that while CMU will inhibit root growth, the primary toxic action of this compound is on the aerial portion of the plant. Cooke (3) showed that CMU brought about a large decrease in the sugar content of plants and suggested that the mode of action was through an interference with photosynthesis.

Type
Brief Papers
Information
Weeds , Volume 4 , Issue 4 , October 1956 , pp. 397 - 398
Copyright
Copyright © 1956 Weed Science Society of America 

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References

Literature Cited

1. Bucha, H. C., and Todd, C. W. 3–(p–chlorophenyl)–1,1–dimethylurea—a new herbicide. Science 114:493–494. 1951.CrossRefGoogle ScholarPubMed
2. Christoph, R. J., and Fisk, E. L. Responses of plants to the herbicide 3–(p–chlorophenyl)–1,1–dimethylurea (CMU). Bot. Gaz. 116:1–14. 1954.Google Scholar
3. Cooke, A. R. Effect of CMU on the biochemical composition of several legumes. Res. Report, North Central Weed Control Conference, p. 181. 1955.Google Scholar
4. Horwitz, L. The properties of Janus Green B as a Hill oxidant. Plant Physiol. 30:10–15. 1955.CrossRefGoogle ScholarPubMed
5. Muzik, T. J., Cruzado, H. J., and Loustalot, A. J. Studies on the absorption, translocation, and action of CMU. Bot. Gaz. 116:65–73. 1954.Google Scholar
6. MacDowall, F. D. H. The effects of some inhibitors of photosynthesis upon the photochemical reduction of a dye by isolated chloroplasts. Plant Physiol. 24:462–480. 1949.Google Scholar