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Annals of Botany 52: 877-883, 1983
© 1983 Annals of Botany Company

RESEARCH-ARTICLE

The Effect of Calmodulin Antagonists on Gibberellic Acid-induced Enzyme Secretion in Barley Aleurone Layers

TORU OBATA*, HAJIME TANIGUCHI and YOSHIHARU MARUYAMA

Division of Bio-function Research, Biomedical Research Laboratories, Jikei University School of Medicine Minato, 105 Tokyo, Japan
Laboratory of Biochemistry, Department of Agricultural Chemistry, University of Tokyo Bunkyo, 113

* To whom requests for reprints should be addressed.

Accepted: 26 January 1983   

Calmodulin activity was detected and assayed in barley aleurone cells. The effect of calmodulin antagonists on GA3-induced enzyme synthesis and secretion in barley aleurone layers was also investigated. These calmodulin antagonists (chlorpromazine, haloperidol) inhibited only GA2-induced {alpha}-amylase secretion. This inhibitory effect was intensified after 6 h of GA3-incubation. This leads us to suggest that some calmodulin-controlled mechanism is involved in GA2-induced {alpha}-amylase secretion.

Hordeum vulgare L., barley aleurone cells, gibberellic acid, {alpha}-amylase secretion, calmodulin, calmodulin antagonist


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