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Articles

An Early Response to Gibberellic Acid Not Requiring Protein Synthesis ^1,2

J. E. Varner^b

^a Michigan State University-Atomic Energy Commission Plant Research Laboratory, Michigan State University East Lansing, Michigan 48824, Department of Biology, Washington University, St. Louis, Missouri 63130

Cell-free extracts from gibberellic acid-treated barley (Hordeum vulgare L. cv. Himalaya) aleurone layers show phosphorylcholine glyceride transferase activity greater than that from control layers. The increase in activity is not prevented by a mixture of amino acid analogs nor by cordycepin under conditions in which it is demonstrated that the analogs and the cordycepin are entering the cells in effective concentrations. We conclude therefore that the GA₃-dependent increase in phosphorylcholine glyceride transferase activity (which occurs within the first 4 hours of GA₃ treatment) does not require RNA synthesis or protein synthesis.

² Dedicated to the memory of Ernest Sondheimer.