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Inhibition of Photochemical Activity of Isolated Chloroplasts by Polycyclic Ureas

Published online by Cambridge University Press:  12 June 2017

D. E. Moreland  and
K. L. Hill
D. E. Moreland
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Crop Science Department, N. C. State College, Raleigh
K. L. Hill
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Crop Science Department, N. C. State College, Raleigh
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Abstract

The effect of fully-saturated bicyclic and partially-saturated tricyclic dimethylureas and dimethylthioureas on the photolytic activity (Hill reaction) of chloroplasts isolated from turnip greens (Brassica spp.) was studied. Photochemical activity was measured potentiometrically with ferricyanide as the electron acceptor. Chemicals tested were 3-[5-(3a,4,5,6,7,7a-hexahydro-4,7-methanoindenyl)]-1,1-dimethylurea; 3-(chloro-2-norbornyl)-1,1-dimethylurea; 1,1-dimethyl-3-(2-norbornyl)urea; and the 3 corresponding thioureas. Concentrations of the 3 polycyclic ureas required to inhibit the Hill reaction by 50 percent (I50) were respectively 4.0 × 10-6 M, 1.2 × 10-5 M, and 6.6 × 10-5 M. The thioureas were not very inhibitory to the Hill reaction; consequently, their I50 values were not determined. The fully or partially-saturated polycyclic dimethylureas were weaker inhibitors of the Hill reaction than the phenyldimethylureas. The decreased inhibitory activity of the polycyclic ureas was attributed to increased lipophilic properties, unfavorable spatial configurations, and lack of resonance interaction between the ring system and the imino nitrogen.

Type
Research Article
Information
Weeds , Volume 11 , Issue 4 , October 1963 , pp. 284 - 287
Copyright
Copyright © 1963 Weed Science Society of America 

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References

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