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Metabolism and Enzymology

Imidazolinone-Induced Loss of Acetohydroxyacid Synthase Activity in Maize Is Not Due to the Enzyme Degradation

American Cyanamid Company, P.O. Box 400, Princeton, New Jersey 08543-0400

Acetohydroxyacid synthase (AHAS), the first enzyme leading to the biosynthesis of valine, leucine, and isoleucine, is inhibited by different chemical classes of herbicides. There is a loss in the extractable AHAS activity in imidazolinone-treated plants. Immunological studies using a monoclonal antibody against AHAS revealed no degradation of AHAS protein in imidazolinone-treated maize (Zea mays) plants. Therefore, the loss in AHAS activity is not due to the loss of AHAS protein.