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Plant and Cell Physiology, 1993, Vol. 34, No. 7 1039-1044
© 1993

Accumulation of Phenylpropanoids in Cotyledons of Morning Glory (Pharbitis nil) Seedlings during the Induction of Flowering by Poor Nutrition

Nobuhiro Hirai, Yasuhiro Kojima, Koichi Koshimizu, Masateru Shinozaki and Atsushi Takimoto

Faculty of Agriculture, Kyoto University Kyoto, 606-01 Japan

Flowering of Pharbitis nil strain Violet is induced in continuous light under poor nutritional conditions. High-performance liquid chromatography of extracts of the cotyledons revealed that two compounds in addition to chlorogenic acid accumulate under such conditions. The compounds were identified as pinoresinol glucoside and p-coumaroylquinic acid. The endogenous levels of these phenylpropanoids were correlated with the flowering response when nutrition was poor. However, activation of phenylpropanoid biosynthesis seemed not to be essential for the induction of flowering.

(Received May 17, 1993; Accepted July 26, 1993)
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