Journal Article

Disease Resistance against <i>Magnaporthe grisea</i> is Enhanced in Transgenic Rice with Suppression of <b>ω</b>-3 Fatty Acid Desaturases

Asanori Yara, Takashi Yaeno, Morifumi Hasegawa, Hideharu Seto, Jean-Luc Montillet, Kensuke Kusumi, Shigemi Seo and Koh Iba

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 9, pages 1263-1274
Published in print September 2007 | ISSN: 0032-0781
Published online September 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm107
Disease Resistance against Magnaporthe grisea is Enhanced in Transgenic Rice with Suppression of ω-3 Fatty Acid Desaturases

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Linolenic acid (18:3) is the most abundant fatty acid in plant membrane lipids and is a source for various oxidized metabolites, called oxylipins. 18:3 and oxylipins play important roles in the induction of defense responses to pathogen infection and wound stress in Arabidopsis. However, in rice, endogenous roles for 18:3 and oxylipins in disease resistance have not been confirmed. We generated 18:3-deficient transgenic rice plants (F78Ri) with co-suppression of two ω-3 fatty acid desaturases, OsFAD7 and OsFAD8. that synthesize 18:3. The F78Ri plants showed enhanced resistance to the phytopathogenic fungus Magnaporthe grisea. A typical 18:3-derived oxylipin, jasmonic acid (JA), acts as a signaling molecule in defense responses to fungal infection in Arabidopsis. However, in F78Ri plants, the expression of JA-responsive pathogenesis-related genes, PBZ1 and PR1b, was induced after inoculation with M. grisea, although the JA-mediated wound response was suppressed. Furthermore, the application of JA methyl ester had no significant effect on the enhanced resistance in F78Ri plants. Taken together, our results indicate that, although suppression of fatty acid desaturases involves the concerted action of varied oxylipins via diverse metabolic pathways, 18:3 or 18:3-derived oxylipins, except for JA, may contribute to signaling on defense responses of rice to M. grisea infection.

Keywords: Fatty acid desaturase — Jasmonic acid — Linolenic acid — Magnaporthe grisea — Oryza sativa — Oxylipin

Journal Article.  6157 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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