Youbong Hyun,¹ Sungwook Choi,¹ Hyun-Ju Hwang,¹ Jihyeon Yu,¹ Sang-Jip Nam,² Jaeyoung Ko,² Ju-Young Park,³ Young Sam Seo,⁴ Eun Yu Kim,⁴ Stephen Beungtae Ryu,⁵ Woo Taek Kim,⁴ Yong-Hwan Lee,³ Heonjoong Kang,² and Ilha Lee^1,6,*

¹ National Research Laboratory of Plant Developmental Genetics, Department of Biological Sciences, Seoul National University, Seoul 151-742, Korea
² School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea
³ Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Korea
⁴ Department of Biology, College of Science, Yonsei University, Seoul 120-749, Korea
⁵ Bio-Evaluation Center, Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, Korea
⁶ Global Research Laboratory for Flowering at SNU and UW, Seoul 151-742, Korea

^*Corresponding author
Ilha Lee

Summary

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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