Journal Article

Stress-Induced Factor Involved in Flower Formation of <i>Lemna</i> is an α-Ketol Derivative of Linolenic Acid

Mineyuki Yokoyama, Shoko Yamaguchi, Shinji Inomata, Kazuo Komatsu, Seiichi Yoshida, Toshii Iida, Yoshihiro Yokokawa, Michihiro Yamaguchi, Sumiko Kaihara and Atsushi Takimoto

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 1, pages 110-113
Published in print January 2000 | ISSN: 0032-0781
Published online January 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/41.1.110
Stress-Induced Factor Involved in Flower Formation of Lemna is an α-Ketol Derivative of Linolenic Acid

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A stress-induced substance(s) (factor C) incubated with norepinephrine (NE) has strong flower-inducing activity in Lemna paucicostata. We isolated an essential component (FIF) of factor C, and clarified its chemical structure as 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid, an α-ketol derivative of linolenic acid, which is formed via 9-hydroperoxy linolenic acid. Synthesized FIF showed flower-inducing activity after incubation with NE (factor C activity) equivalent to that formed in the stressed Lemna. Jasmonic acid and 13-hydroxy-12-oxo-9(Z),15(Z)-octadecadienoic acid (12,13-α-ketol linolenic acid), both of which are formed via 13-hydroperoxide of linolenic acid and all other derivatives of FIF synthesized by chemical and enzymatic processes failed to show the factor C activity. These results suggest that the molecular structure of FIF is very specific for the factor C activity.

Keywords: Flowering; Lemna; Linolenic acid; Octadecadienoic acid; Oxilipin; Stress

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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