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Altered Disease Development in the eui Mutants and Eui Overexpressors Indicates that Gibberellins Negatively Regulate Rice Basal Disease Resistance

引用

Molecular Plant 2008年第3期1卷 528-537页

作者： Dong-Lei Yang Qun Li Yi-Wen Deng Yong-Gen Lou Mu-Yang Wang Guo-Xing Zhou Ying-Ying Zhang Zu-Hua He National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academyof Sciences Shanghai China Institute of Insect Science College of Agriculture and Biotechnology Zhejiang University Hangzhou China

Gibberellins （GAs） form a group of important plant tetracyclic diterpenoid hormones that are involved in many aspects of plant growth and development. Emerging evidence implicates that GAs also play roles in stress responses. However, the role of GAs in biotic stress is largely unknown. Here, we report that knockout or overexpression of the Elongated uppermost internode （Eu~ gene encoding a GA deactivating enzyme compromises or increases, respectively, disease resistance to bacterial blight （Xanthomonas oryzae pv. oyrzae） and rice blast （Magnaporthe oryzae）. Exogenous application of GA3 and the inhibitor of GA synthesis （uniconazol） could increase disease susceptibility and resistance, respectively, to bacterial blight. Similarly, uniconazol restored disease resistance of the eui mutant and GA3 decreased disease resistance of the Eui overexpressors to bacterial blight. Therefore, the change of resistance attributes to GA levels. In consistency with this, the GA metabolism genes OsGA2Oox2 and OsGA20xl were down-regulated during pathogen challenge. We also found that PRla induction was enhanced but the SA level was decreased in the Eui overexpressor, while the JA level was reduced in the eui mutant. Together, our current study indicates that GAs play a negative role in rice basal disease resistance, with EUI as a positive modulator through regulating the level of bioactive GAs.

关键词： SYSTEMIC ACQUIRED-RESISTANCE SALICYLIC-ACID CELL-DEATH SIGNALING PATHWAY GREEN-REVOLUTION dependent growth

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