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Plant and Cell Physiology, 1995, Vol. 36, No. 8 1511-1517
© 1995

Induction of Browning of Male Flowers of Cryptomeria japonica by Treatment with Fatty Acids: Mechanism and the Role of trans-2-Hexenal

Kaihei Koshio, Hisamitsu Takahashi and Yasuo Ota

Laboratory of Tropical Horticulture, Tokyo University of Agriculture 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo, 156 Japan

The effect of treatment with fatty acids on the browning of male flowers of Cryptomeria japonica and its mechanism were studied with emphasis on the role of trans-2-hexenal. The effect of treatment with fatty acids on the browning of male flowers was the highest when fatty acids were applied at the end of August, decreasing month by month thereafter in parallel with the seasonal changes in lipoxygenase activity. trans-2-Hexenal, which is formed from linolenic acid in a reaction catalyzed by lipoxygenase (EC 1.13.1.13 [EC] ), stimulated the evolution of ethylene and acetaldehyde in male flowers predominantly, with resultant enhancement of the activity of phenylalanine ammonia-lyase (EC 4.3.1.5 [EC] ), and the browning of male flowers. A possible biochemical pathway for browning of male flowers of Cryptomeria japonica is discussed.

(Received September 19, 1994; Accepted September 7, 1995)
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