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Plant and Cell Physiology, 1982, Vol. 23, No. 3 473-477
© 1982

Article

Effect of High-intensity Light Given Prior to Low-temperature Treatment on the Long-day Flowering of Pharbitis nil

Masateru Shinozaki, Masayuki Hikichi, Kazuichi Yoshida, Kazuo Watanabe and Atsushi Takimoto

Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan

Pharbitis nil, strain Violet which had been exposed to high-intensity light (18,000 lux at 23°C) for 7 days followed by a low-temperature treatment (13–14°C) for 7 days initiated flower buds even under continuous light, but plants given these treatments in reverse order failed to bud. Three days of high-intensity light at 23°C was most effective in promoting the flower-inducing effect of the subsequent low-temperature period. Six days of low temperature following the 3-day high-intensity light period induced near-maximum flowering response. DCMU (5×10–6 M) given during the high-intensity light period inhibited flowering, but when given during or after the low-temperature period it was ineffective. DCMU at the same concentration given before, during or after an inductive 16-hr dark period at 26°C did not inhibit flowering. Sucrose, ATP, NADPH and some other reducing agents tested did not nullify the DCMU effect nor substitute for the effect of high-intensity light. But, the high-intensity light effect could be substituted, at least partly, by 5-chlorosalicylic acid, 3,4-dichlorobenzoic acid and some other benzoic acid derivatives, which are highly effective in inducing long-day flowering in the short-day plant, Lemna paucicostata.

(Received October 20, 1981; Accepted February 3, 1982)
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