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Cyclic Nucleotide Phosphodiesterase Activity in Barley Seeds ^1,2

^a Department of Agronomy and Range Science and Department of Environmental Horticulture, University of California, Davis, California 95616

Barley seeds (Hordeum vulgare L. cv. Himalaya) contain an enzymatic activity which catalyzes the hydrolysis of adenosine cyclic 3': 5'-monophosphate and adenosine cyclic 2': 3'-monophosphate. A large portion of the enzymatic activity is present in the dry seed, existing in both soluble and particulate form. Secretion of the soluble phosphodiesterase from embryoless seeds is enhanced by gibberellic acid and inhibited by abscisic acid, dinitrophenol, and cycloheximide. Attempts to isolate or detect a phosphodiesterase which specifically hydrolyzes adenosine cyclic 3': 5'-monophosphate were unsuccessful. Inhibition experiments indicate that probably one enzyme is involved in the hydrolysis of both of these substrates.

⁴ Postdoctoral Fellow of the National Institutes of Health, National Institute of General Medical Sciences (GM 50553-02). Present Address: Institute of Biological Sciences, Syntex Research, Palo Alto, Calif. 94304.

¹ This research was supported by a National Defense Education Act Title IV Fellowship.

² Most of the research reported herein is derived from the doctoral thesis of J. Vandepeute accepted by the Plant Physiology Group of the University of California at Davis in partial fulfillment of the requirements for the Ph.D. degree.

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