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American Zoologist 1975 15(2):237-240; doi:10.1093/icb/15.2.237
© 1975 by The Society for Integrative and Comparative Biology
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The Role of Membrane-Bound Enzymes in an Early Response of Aleurone Tissue to Gibberellic Acid

J. E. VARNER and YOSEF BEN-TAL
Department of Biology, Washington University St. Louis, Missouri 63130
MSU/AEC Plant Research Laboratory, Michigan State University East Lansing, Michigan 4882

Treatment of aleurone layers of barley seed with gibberellic acid increases the observable phosphorylcholine glyceride transferase activity in a membrane fraction prepared from extracts of the aleurone cells. This gibberellic acid-dependent increase in glyceride transferase activity requires neither RNA synthesis nor protein synthesis. Membrane fractions prepared from mixtures of extracts of gibberellic acid-treated layers and control layers have a specific activity of glyceride transferase higher than expected on the basis of simple addition of the activities from the two sources. Therefore, some kind of activation is occurring.


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