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Plant Physiology 60:730-735 (1977)
© 1977 American Society of Plant Biologists

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Articles

Regulation of Lipid Synthesis in Soybeans by Two Benzoic Acid Herbicides 1

Raad K. Muslih2 and Dean L. Linscott

a Department of Agronomy, Cornell University, Ithaca, New York 14853

The effects of 3-nitro-2,5-dichlorobenzoic acid (dinoben) and 3-amino-2,4-dichlorobenzoic acid (chloramben) on lipid formation and on the incorporation of various substrates into lipids by intact seeds and subcellular fractions of germinating soybean (Glycine max [L.] Merr. `Amsoy') were studied. Dinoben (20 µg/ml) inhibited synthesis of total lipids 67%, neutral lipids 73%, glycolipids 51%, and phospholipids 39% in germinating seeds. When polar lipids were analyzed further, inhibition of individual lipid classes was also observed. Chloramben (20 µg/ml) stimulated total lipid synthesis 25%. With the exception of the mitochondrial fraction where malonate thiokinase was absent, dinoben inhibited up to 99% the incorporation of acetate and malonate into lipids, but did not inhibit acetyl-CoA and malonyl-CoA incorporation. Chloramben stimulated the incorporation of all substrates tested into lipids by all fractions except the mitochondrial fraction when malonate was the substrate. When dinoben and chloramben were used in combinations, chloramben did not reverse the inhibitory effect of dinoben.

It is concluded that the dinoben inhibitory effect is specific and is associated with the acetate and malonate thiokinase systems. The chloramben effect is stimulatory to either acetyl-CoA carboxylase or fatty acid synthetase or both.

2 Present address: College of Agriculture, Baghdad University, Baghdad, Iraq.

1 Cooperative investigations of Cornell University and the Agricultural Research Service, United States Department of Agriculture. Department of Agronomy Journal Series 216.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1977 by the American Society of Plant Biologists