The Plant Cell, Vol. 13, 2191-2209,
October 2001, Copyright © 2001,
American Society of Plant Biologists
The DEFECTIVE IN ANTHER DEHISCENCE1 Gene Encodes a Novel Phospholipase A1 Catalyzing the Initial Step of Jasmonic Acid Biosynthesis, Which Synchronizes Pollen Maturation, Anther Dehiscence, and Flower Opening in Arabidopsis
Sumie Ishiguroa,
Akiko Kawai-Odab,
Junichi Uedac,
Ikuo Nishidad and
Kiyotaka Okada1,a
a Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
b National Institute for Basic Biology, Okazaki 444-8585, Japan
c College of Integrated Arts and Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
d Department of Biological Science, Graduate School of Science, University of Tokyo, Tokyo 113-8656, Japan
1 To whom correspondence should be addressed. E-mail kiyo{at}ok-lab.bot.kyoto-u.ac.jp; fax 81-75-753-4257
The Arabidopsis mutant defective in anther dehiscence1 (dad1) shows defects in anther dehiscence, pollen maturation, and flower opening. The defects were rescued by the exogenous application of jasmonic acid (JA) or linolenic acid, which is consistent with the reduced accumulation of JA in the dad1 flower buds. We identified the DAD1 gene by T-DNA tagging, which is characteristic to a putative N-terminal transit peptide and a conserved motif found in lipase active sites. DAD1 protein expressed in Escherichia coli hydrolyzed phospholipids in an sn-1specific manner, and DAD1green fluorescent protein fusion protein expressed in leaf epidermal cells localized predominantly in chloroplasts. These results indicate that the DAD1 protein is a chloroplastic phospholipase A1 that catalyzes the initial step of JA biosynthesis. DAD1 promoter:: -glucuronidase analysis revealed that the expression of DAD1 is restricted in the stamen filaments. A model is presented in which JA synthesized in the filaments regulates the water transport in stamens and petals.
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