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Plant and Cell Physiology, 1982, Vol. 23, No. 4 631-638
© 1982

Article

Lipoxygenase, Hydroperoxide Lyase and Volatile C6-Aldehyde Formation from C18-Fatty Acids during Development of Phaseolus vulgaris L.

Jiro Sekiya, Hidenori Kamiuchi and Akikazu Hatanaka

Department of Agricultural Chemistry, Faculty of Agriculture, Yamaguchi University Yamaguchi 753, Japan

Kidney bean plants (Phaseolus vulgaris) were found to have the capability to produce C6-aldehydes (hexanal and hexenals) from linoleic and linolenic acids. The various organs tested had lipoxygenase and hydroperoxide lyase activities responsible for the C6-aldehyde formation. Young leaves showed relatively high activities for C6-aldehyde formation. However, the activities of the leaves decreased gradually with leaf expansion. Seedlings and seeds containing cotyledons showed low activities for C6-aldehyde formation, because of the occurrence of an inhibitory factor in the cotyledons. The substrate specificity of the enzymes was essentially the same among the various developmental stages of leaves tested.

(Received February 5, 1982; Accepted March 19, 1982)
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