生物
MYB公司
拟南芥
基因
非生物胁迫
转基因水稻
非生物成分
转录因子
基因表达
细胞生物学
脱落酸
突变体
水稻
植物
脯氨酸
遗传学
基因表达调控
转基因作物
转基因
古生物学
作者
Ning Zhu,Saifeng Cheng,Xiaoyun Liu,Hao Du,Mingqiu Dai,Dao-Xiu Zhou,Wenjing Yang,Yu Zhao
出处
期刊:Plant Science
[Elsevier]
日期:2015-07-01
卷期号:236: 146-156
被引量:154
标识
DOI:10.1016/j.plantsci.2015.03.023
摘要
Plants have evolved a number of different mechanisms to respond and to adapt to abiotic stress for their survival. However, the regulatory mechanisms involved in coordinating abiotic stress tolerance and plant growth are not fully understood. Here, the function of OsMYB91, an R2R3-type MYB transcription factor of rice was explored. OsMYB91 was induced by abiotic stress, especially by salt stress. Analysis of chromatin structure of the gene revealed that salt stress led to rapid removal of DNA methylation from the promoter region and rapid changes of histone modifications in the locus. Plants over-expressing OsMYB91 showed reduced plant growth and accumulation of endogenous ABA under control conditions. Under salt stress, the over-expression plants showed enhanced tolerance with significant increases of proline levels and a highly enhanced capacity to scavenge active oxygen as well as the increased induction of OsP5CS1 and LOC_Os03g44130 compared to wild type, while RNAi plants were less sensitive. In addition, expression of OsMYB91 was also induced by other abiotic stresses and hormone treatment. More interestingly, SLR1, the rice homolog of Arabidopsis DELLA genes that have been shown to integrate endogenous developmental signals with adverse environmental conditions, was highly induced by OsMYB91 over-expression, while the salt-induction of SLR1 expression was impaired in the RNAi plants. These results suggested that OsMYB91 was a stress-responsive gene that might be involved in coordinating rice tolerance to abiotic stress and plant growth by regulating SLR1 expression.
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