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Phytochromes Regulate SA and JA Signaling Pathways in Rice and Are Required for Developmentally Controlled Resistance to Magnaporthe grisea

文献类型： 外文期刊

作者： Xie, Xian-Zhi 1 ; Xue, Yan-Jiu 1 ; Zhou, Jin-Jun 1 ; Zhang, Bin 1 ; Chang, Hong 3 ; Takano, Makoto 4 ;

作者机构： 1.Shandong Acad Agr Sci, High Tech Res Ctr, Jinan 250100, Peoples R China

2.Minist Agr, Lab Crop Genet Improvement & Biotechnol, Jinan 250100, Peoples R China

3.Shanxi Agr Univ, Coll Life Sci, Taigu 030801, Shanxi, Peoples R China

4.Natl Inst Agrobiol Sci, Tsukuba, Ibaraki 3058602, Japan

关键词： phytochrome;salicylic acid: 69-72-7;signaling;jasmonate: signaling;pathogenesis-related class-1a: PR1a;accumulation;phyAphyBphyC;pathogenesis-related class-1b: PR1b;disease resistance;defense pathway

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

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收录情况： SCI

摘要： Old leaves of wild-type rice plants (Oryza sativa L. cv. Nipponbare) are more resistant to blast fungus (Magnaporthe grisea) than new leaves. In contrast, both old and new leaves of the rice phytochrome triple mutant (phyAphyBphyC) are susceptible to blast fungus. We demonstrate that pathogenesis-related class 1 (PR1) proteins are rapidly and strongly induced during M. grisea infection and following exogenous jasmonate (JA) or salicylic acid (SA) exposure in the old leaves, but not in the new leaves of the wild-type. In contrast, the accumulation of PR1 proteins was significantly attenuated in old and new leaves of the phyAphyBphyC mutant. These results suggest that phytochromes are required for the induction of PR1 proteins in rice. Basal transcription levels of PR1a and PR1b were substantially higher in the wild-type as compared to the phyAphyBphyC mutant, suggesting that phytochromes also are required for basal expression of PR1 genes. Moreover, the transcript levels of genes known to function in SA- or JA-dependent defense pathways were regulated by leaf age and functional phytochromes. Taken together, our findings demonstrate that phytochromes are required in rice for age-related resistance to M. grisea and may indirectly increase PR1 gene expression by regulating SA- and JA-dependent defense pathways.

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