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首页> 外文期刊>Journal of Experimental Botany >The rice ERF transcription factor OsERF922 negatively regulates resistance to Magnaporthe oryzae and salt tolerance
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The rice ERF transcription factor OsERF922 negatively regulates resistance to Magnaporthe oryzae and salt tolerance

机译：水稻ERF转录因子OsERF922负调节对稻瘟病菌的抗性和耐盐性

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摘要

Rice OsERF922, encoding an APETELA2/ethylene response factor (AP2/ERF) type transcription factor, is rapidly and strongly induced by abscisic acid (ABA) and salt treatments, as well as by both virulent and avirulent pathovars of Magnaporthe oryzae, the causal agent of rice blast disease. OsERF922 is localized to the nucleus, binds specifically to the GCC box sequence, and acts as a transcriptional activator in plant cells. Knockdown of OsERF922 by means of RNAi enhanced resistance against M. oryzae. The elevated disease resistance of the RNAi plants was associated with increased expression of PR, PAL, and the other genes encoding phytoalexin biosynthetic enzymes and without M. oryzae infection. In contrast, OsERF922-overexpressing plants showed reduced expression of these defence-related genes and enhanced susceptibility to M. oryzae. In addition, the OsERF922-overexpressing lines exhibited decreased tolerance to salt stress with an increased Na+/K+ ratio in the shoots. The ABA levels were found increased in the overexpressing lines and decreased in the RNAi plants. Expression of the ABA biosynthesis-related genes, 9-cis-epoxycarotenoid dioxygenase (NCED) 3 and 4, was upregulated in the OsERF922-overexpressing plants, and NCED4 was downregulated in the RNAi lines. These results suggest that OsERF922 is integrated into the cross-talk between biotic and abiotic stress-signalling networks perhaps through modulation of the ABA levels.
机译：编码APETELA2 /乙烯反应因子（AP2 / ERF）型转录因子的水稻OsERF922，可通过脱落酸（ABA）和盐处理，以及稻瘟病菌（Magnaporthe oryzae）的致病力和无毒力快速而强烈地诱导。稻瘟病。 OsERF922位于细胞核中，与GCC盒序列特异性结合，并在植物细胞中充当转录激活因子。通过RNAi抑制OsERF922可增强对米曲霉的抗性。 RNAi植物抗病性的提高与PR，PAL和其他编码植物抗毒素生物合成酶的基因的表达增加有关，而没有米曲霉感染。相反，过表达OsERF922的植物显示这些防御相关基因的表达减少，并且对米曲霉的敏感性增加。另外，过表达OsERF922的品系显示出对盐胁迫的耐受性降低，且芽中的Na + / K + 比率增加。发现ABA水平在过表达品系中增加而在RNAi植物中降低。在过表达OsERF922的植物中，ABA生物合成相关基因9-顺式-环氧类胡萝卜素双加氧酶（NCED）3和4的表达上调，而RNAi系中NCED4的表达下调。这些结果表明，OsERF922可能通过调节ABA水平而被整合到生物和非生物应激信号网络之间的串扰中。

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