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Inhibition of photochemical activity of isolated chloroplasts by polycyclic ureas



Inhibition of photochemical activity of isolated chloroplasts by polycyclic ureas



Weeds 11(4): 284-287



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% (I50) were respectively 4.0 x 10-6 M, 1.2 x 10-5 M, and 6.6 x 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.

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Accession: 014082898

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DOI: 10.2307/4040532


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