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Plant and Cell Physiology, 1980, Vol. 21, No. 6 1031-1039
© 1980

Article

Relation between auxin autotrophy and tryptophan content in sunflower crown gall cells in culture

Shigeaki Atsumi

Department of Biology, College of General Education, University of Tokyo Komaba, Meguro-ku, Tokyo 153, Japan

The content of indoleacetic acid (IAA) in cultured sunflower crown gall cells was high in the transitional stage from the log to the stationary stage. In contrast, the content of tryptophan was low in the log, transitional and stationary stages, but in the necrotic stage it showed an increase of ca. 80 times that of the log and stationary stages. Although tryptophan transaminase activity per gram of fresh weight of the cells was detected throughout the culture period, with a slight increase in the transitional stage, its specific activity remained low in the log and stationary stages, but increased in the necrotic stage to two or three times that of the log or stationary stages. The accumulation of IAA in the transitional stage was not accompanied by an increase in tryptophan. It might be regulated by the action of the IAA protector, and the accumulation of IAA in the necrotic stage might be regulated by the amount of tryptophan and the IAA protector.

(Received April 11, 1980; )
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