Journal Article

Involvement of OsJAZ8 in Jasmonate-Induced Resistance to Bacterial Blight in Rice

Shoko Yamada, Akihito Kano, Daisuke Tamaoki, Ayumi Miyamoto, Hodaka Shishido, Seika Miyoshi, Shiduku Taniguchi, Kazuya Akimitsu and Kenji Gomi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 53, issue 12, pages 2060-2072
Published in print December 2012 | ISSN: 0032-0781
Published online October 2012 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcs145
Involvement of OsJAZ8 in Jasmonate-Induced Resistance to Bacterial Blight in Rice

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

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The plant hormone jasmonic acid (JA) has a crucial role in both host immunity and development in plants. Here, we report the importance of JA signaling in the defense system of rice. Exogenous application of JA conferred resistance to bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) in rice. Expression of OsJAZ8, a rice jasmonate ZIM-domain protein, was highly up-regulated by JA. OsJAZ8 interacted with a putative OsCOI1, which is a component of the SCFCOI1 E3 ubiquitin ligase complex, in a coronatine-dependent manner. OsJAZ8 also formed heterodimers with other OsJAZ proteins but did not form homodimer. JA treatment caused OsJAZ8 degradation and this degradation was dependent on the 26S proteasome pathway. Furthermore, the JA-dependent OsJAZ8 degradation was mediated by the Jas domain. Transgenic rice plants overexpressing OsJAZ8ΔC, which lacks the Jas domain, exhibited a JA-insensitive phenotype. A large-scale analysis using a rice DNA microarray revealed that overexpression of OsJAZ8ΔC altered the expression of JA-responsive genes, including defense-related genes, in rice. Furthermore, OsJAZ8ΔC negatively regulated the JA-induced resistance to Xoo in rice. On the basis of these data, we conclude that JA plays an important role in resistance to Xoo, and OsJAZ8 acts as a repressor of JA signaling in rice.

Keywords: Induced resistance; Jasmonic acid; JAZ protein; Rice; Xanthomonas oryzae

Journal Article.  7526 words.  Illustrated.

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

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