Biosynthetic pathway for C6-aldehydes formation from linolenic acid in green leaves

Akikazu Hatanaka, Tadahiko Kajiwara, Jiro Sekiya

doi:10.1016/0009-3084(87)90057-0

Biosynthetic pathway for C6-aldehydes formation from linolenic acid in green leaves

DOI Web Site Web Site 被引用文献8件

書誌事項

公開日: 1987-07

権利情報

https://www.elsevier.com/tdm/userlicense/1.0/

DOI

10.1016/0009-3084(87)90057-0

公開者: Elsevier BV

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説明

Abstract ‘Green odour’ of green leaves consists of six volatile compounds of C6-aldehydes and C6-alcohols including leaf aldehyde, (2E)-hexenal, and leaf alcohol, (3Z)-hexenol. These volatile compounds are biosynthesized from linolenic and linoleic acids via their respective hydroperoxides in green leaves. Four enzymes catalyse this biosynthetic pathway. Among these, especially interesting enzymes are lipoxygenase and hydroperoxide lyase. The enzyme system is found in green leaves bound to the lamella membrane of chloroplasts. The lipoxygenase stereoselectively adds oxygen to unsaturated fatty acids having a (1Z, 4Z)-pentadiene moiety, such as linolenic and linoleic acids, to produce 13-(S)-hydroperoxides. The hydroperoxide lyase cleaves the bond between C-12 and C-13 of these hydroperoxides into C6-aldehydes. With regard to environmental effects on these enzymes, the activities change seasonally and appear to be closely related to temperature and to solar radiation received.