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Published on September 29, 2006; 10.1104/pp.106.085258

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Received June 16, 2006
Accepted September 5, 2006

Contribution of Ethylene Biosynthesis for Resistance to Blast Fungus Infection in Young Rice Plants

Takayoshi Iwai , Atsushi Miyasaka , Shigemi Seo , and Yuko Ohashi *

National Institute of Agrobiological Sciences (NIAS), Tsukuba, Ibaraki 305-8602, JAPAN; Miyagi Prefectural Agriculture and Horticulture Research Center, Takadate-kawakami, Natori, Miyagi 981-1243, JAPAN
National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8518, JAPAN
National Institute of Agrobiological Sciences (NIAS), Tsukuba, Ibaraki 305-8602, JAPAN

* Corresponding author; email: yohashi{at}affrc.go.jp.

The role of ethylene (ET) in resistance to infection with Magnaporthe grisea (blast fungus) in rice (Oryza sativa L.) is poorly understood. To study it, we quantified ET levels after the inoculation using young rice plants at 4-leaf stage of cv. Nipponbare (WT) and its isogenic plant (IL7) which contains Pi-i resistance gene to blast fungus race 003. Small necrotic lesions by hypersensitive reaction (HRLs) were formed at 42 to 72 hours post inoculation (hpi) in resistant IL7 leaves, and whitish expanding lesions (ELs) at 96 hpi in susceptible WT leaves. Notable was the enhanced ET emission at 48 hpi accompanied by increased ACC levels and highly elevated ACC oxidase (ACO) activity in IL7 leaves, while only an enhanced ACC increase at 96 hpi in WT leaves. Among six ACS (ACC synthase) and seven ACO genes found in the rice genome, OsACS2 was transiently expressed at 48 hpi in IL7 and 96 hpi in WT, and OsACO7 was at 48 hpi in IL7. Treatment with an inhibitor for ACS, aminooxyacetic acid (AOA), suppressed the enhanced ET emission at 48 hpi in IL7 resulting ELs instead of HRLs. Exogenously supplied ACC compromised the AOA-induced breakdown of the resistance in IL7, and treatment with 1-MCP and STS, the inhibitors of ET action, did not suppress the resistance. These findings suggest the importance of ET biosynthesis, consequently the coproduct, cyanide for HR-accompanied resistance to blast fungus in young rice plants and the contribution of induced OsACS2 and OsACO7 gene expression to it.




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