Plant and Cell Physiology Advance Access published online on January 13, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pci253
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1 Department of Biology, Faculty of Sciences, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
* To whom correspondence should be addressed. The Arabidopsis FAD7 gene encodes a plastid
Received September 2, 2005
Accepted December 27, 2005
Regular Paper
Ozone-Induced Expression of Arabidopsis FAD7 Gene Requires Salicylic Acid, but not NPR1 and SID2
Takashi Yaeno 1,
Bunnai Saito 2,
Tsutomu Katsuki 2,
and
Koh Iba 1 *
2 Department of Chemistry, Faculty of Sciences, Graduate School, Kyushu University, 33, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
Koh Iba, E-mail: koibascb{at}mbox.nc.kyushu-u.ac.jp
Abstract 
-3 fatty acid desaturase that catalyzes the desaturation of dienoic fatty acids to trienoic fatty acids in chloroplast membrane lipids. The expression of FAD7 was rapidly and locally induced by ozone exposure, which causes oxidative responses equivalent to pathogen-induced hypersensitive responses and subsequently activates various defense related genes. This induction was reduced in salicylic acid (SA) deficient NahG plants expressing SA hydroxylase, but was unaffected in etr1 and jar1 mutants, which are insensitive to ethylene and jasmonic acid (JA), respectively. SA dependence of the FAD7 induction was confirmed by the exogenous application of SA. SA-induced expression of FAD7 in the npr1 mutant which is defective in a SA signaling pathway occurred to the same extent as in the wild type. Furthermore, in the sid2 mutant which lacks an enzyme required for SA biosynthesis, the expression of FAD7 was induced by ozone exposure. These results suggest that the ozone-induced expression of FAD7 gene requires SA, but not ethylene, JA, NPR1 and SID2.
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