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Plant and Cell Physiology, 1994, Vol. 35, No. 5 807-810
© 1994

Correlation between Level of Phenylpropanoids in Cotyledons and Flowering in Pharbitis Seedlings under High-Fluence Illumination

Masateru Shinozaki1, Nobuhiro Hirai1, Yasuhiro Kojima1, Koichi Koshimizu1 and Atushi Takimoto2

1Faculty of Agriculture, Kyoto University Kyoto, 606-01 Japan
2Laboratory of Experimental Biology Kyoto, 16-2 Koyama-Hastunecho, Kitaku, Kyoto, 603 Japan

Strain Violet of Pharbitis nil flowers under continuous light when exposed to fluence rate greater than 30 W m–2 (15,000 lux) for 12 days or longer, but strain Kidachi does not flower. A high fluence rate promoted the accumulation of chlorogenic acid (CGA), pinoresinol-ß-glucoside (PRG) and p-coumaroylquinic acid (COQ) in strain Violet, while in strain Kidachi the level of these compounds did not increase even under the highest fluence rate tested. The level of CGA, PRG and COQ in the cotyledons of strain Violet increased in pararell with induction of flowering under high-fluence illumination. Aminooxyacetic acid (AOA) inhibited flowering simulutaneously suppressing the accumulation of CGA and PRG.

(Received November 30, 1993; Accepted May 7, 1994)
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