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Plant and Cell Physiology, 1979, Vol. 20, No. 1 29-42
© 1979

Article

Correlation between induction of auxin-nonrequiring tobacco calluses and increase in inhibitor (s) of IAA-destruction activity

Kunihiko Syono

Department of Pure and Applied Sciences, University of Tokyo Komaba, Meguro-ku, Tokyo, Japan

Decreased IAA-destruction activity by tobacco calluses (T22 and XD6S2) was observed only when the calluses were cultured on a medium favorable for auxin-nonrequiring callus induction. The medium used to induce auxin-nonrequiring calluses from auxin-requiring ones contained 0.1 mg/liter IAA for callus T22 and 10 mg/liter NAA for XD6S2. It was clearly demonstrated both in vivo and in vitro that the result was not due to decreased IAA-destroying enzyme activity itself, but to the increase of an inhibitor(s) of IAA-destruction activity. The accumulated inhibitor(s), which induced a lag in IAA oxidation, was a heat-stable low molecular weight substance(s), unstable in air at room temperature.

The possible involvement of an inhibitor(s) of IAA-destruction in the process of induction for auxin-nonrequiring calluses was discussed.

(Received July 15, 1978; )
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