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Plant and Cell Physiology, 1973, Vol. 14, No. 1 183-193
© 1973

Article

Auxin-induced growth of tuber tissue of Jerusalem artichoke VIII. Role of cyclic AMP in the action of auxin, cytokinin and gibberellic acid

Seiichiro Kamisaka, Naoki Sakurai and Yoshio Masuda

Department of Biology, Faculty of Science, Osaka City University Sumiyoshi-ku, Osaka 558, Japan

Cyclic AMP showed no growth-promoting effect when given alone to unaged slices excised from Jerusalem artichoke tubers. But it synergistically enhanced cell expansion when given together with an auxin, 2,4-dichlorophenoxyacetic acid. Growth responses of aged slices to cyclic AMP were much smaller than those of unaged slices. Cyclic AMP was substantially effective when slices were aged in the presence of cyclic AMP, then were transferred to a growth solution containing auxin. Interactions between cyclic AMP and gibberellic acid or kinetin were additive in promoting auxininduced cell expansion. Both caffeine and theophylline, inhibitors of phosphodiesterase, enhanced the stimulating effect of applied cyclic AMP on auxin-induced cell expansion. But they did not enhance the promoting effect of gibberellic acid or kinetin on auxininduced cell expansion. These results suggest that cyclic AMP did not act as a second messenger for any auxin, gibberellic acid and cytokinin in the promotion of cell expansion in this tissue.

(Received September 27, 1972; )
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