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Cooperation and Functional Diversification of Two Closely Related Galactolipase Genes for Jasmonate Biosynthesis
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 Authours
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Youbong Hyun, Sungwook Choi, Hyun-Ju Hwang, Jihyeon Yu, Sang-Jip Nam, Jaeyoung Ko, Ju-Young Park, Young Sam Seo, Eun Yu Kim, Stephen Beungtae Ryu, Woo Taek Kim, Yong-Hwan Lee, Heonjoong Kang, and Ilha Lee |
| Title |
Cooperation and Functional Diversification of Two Closely Related Galactolipase Genes for Jasmonate Biosynthesis |
| Journal |
Developmental Cell, 2008 (14) ~ |
Abstract
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Jasmonic acid (JA) plays pivotal roles in diverse plant biological processes, including wound response. Chloroplast lipid hydrolysis is a critical step for JA biosynthesis, but the mechanism of this process remains elusive. We report here that DONGLE (DGL), a homolog of DEFECTIVE IN ANTHER DEHISCENCE1 (DAD1), encodes a chloroplast-targeted lipase with strong galactolipase and weak phospholipase A1 activity. DGL is expressed in the leaves and has a specific role in maintaining basal JA content under normal conditions, and this expression regulates vegetative growth and is required for a rapid JA burst after wounding. During wounding, DGL and DAD1 have partially redundant functions for JA production, but they show different induction kinetics, indicating temporally separated roles: DGL plays a role in the early phase of JA production, and DAD1 plays a role in the late phase of JA production. Whereas DGL and DAD1 are necessary and sufficient for JA production, phospholipase D appears to modulate wound response by stimulating DGL and DAD1 expression. |
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