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首页> 外文期刊>Molecular Plant >Altered Disease Development in the eui Mutants and Eui Overexpressors Indicates that Gibberellins Negatively Regulate Rice Basal Disease Resistance
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Altered Disease Development in the eui Mutants and Eui Overexpressors Indicates that Gibberellins Negatively Regulate Rice Basal Disease Resistance

机译：eui突变体和Eui过表达者疾病的发生变化表明，赤霉素对水稻基础病抗性具有负调控作用。

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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 GAsin biotic stress is largely unknown. Here, we report that knockout or overexpression of the Elongated uppermost internode (Eui) 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 GA_3 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 GA_3 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 OsGA20ox2 and OsGA2ox1 were down-regulated during pathogen challenge. We also found that PR1a 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 GAsplay a negative role in rice basal disease resistance, with EUI as a positive modulator through regulating the level of bioactive GAs.
机译：赤霉素（GAs）构成一组重要的植物四环二萜类激素，涉及植物生长和发育的许多方面。越来越多的证据表明，GA在压力反应中也起着作用。但是，GAsin生物应激的作用在很大程度上尚不清楚。在这里，我们报道编码GA失活酶的延长的最上节间（Eui）基因的敲除或过表达分别损害或增加了对细菌白叶枯病（Xanthomonas oryzae pv。oyrzae）和稻瘟病（Magnaporthe oryzae）的抗病性。外源施用GA_3和GA合成抑制剂（uniconazol）可分别增加疾病对白叶枯病的敏感性和抗药性。类似地，十一碳烯唑恢复了eui突变体的抗病性，GA_3降低了Eui过表达者对白叶枯病的抗病性。因此，抗性的变化归因于GA水平。与此相一致，在病原体攻击期间，GA代谢基因OsGA20ox2和OsGA2ox1被下调。我们还发现，在Eui过表达中PR1a诱导增强，但SA水平降低，而eui突变体中JA水平降低。总之，我们目前的研究表明，GAs在水稻基础疾病抗性中起着负面作用，而EUI通过调节生物活性GAs的水平而成为正调节剂。

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    《Molecular Plant》 |2008年第3期|共10页
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  • 正文语种 eng
  • 中图分类 生物科学;
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