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Enhanced Tolerance to Environmental Stress in Transgenic Plants Expressing the Transcriptional Coactivator Multiprotein Bridging Factor 1c1[w]

机译:表达转录共激活因子多蛋白桥连因子1c1 [w]的转基因植物对环境胁迫的耐受性增强。

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摘要

Abiotic stresses cause extensive losses to agricultural production worldwide. Acclimation of plants to abiotic conditions such as drought, salinity, or heat is mediated by a complex network of transcription factors and other regulatory genes that control multiple defense enzymes, proteins, and pathways. Associated with the activity of different transcription factors are transcriptional coactivators that enhance their binding to the basal transcription machinery. Although the importance of stress-response transcription factors was demonstrated in transgenic plants, little is known about the function of transcriptional coactivators associated with abiotic stresses. Here, we report that constitutive expression of the stress-response transcriptional coactivator multiprotein bridging factor 1c (MBF1c) in Arabidopsis (Arabidopsis thaliana) enhances the tolerance of transgenic plants to bacterial infection, heat, and osmotic stress. Moreover, the enhanced tolerance of transgenic plants to osmotic and heat stress was maintained even when these two stresses were combined. The expression of MBF1c in transgenic plants augmented the accumulation of a number of defense transcripts in response to heat stress. Transcriptome profiling and inhibitor studies suggest that MBF1c expression enhances the tolerance of transgenic plants to heat and osmotic stress by partially activating, or perturbing, the ethylene-response signal transduction pathway. Present findings suggest that MBF1 proteins could be used to enhance the tolerance of plants to different abiotic stresses.
机译:非生物胁迫导致全世界农业生产遭受广泛损失。植物通过适应多种防御酶,蛋白质和途径的转录因子和其他调节基因的复杂网络来介导植物适应干旱,盐碱或高温等非生物条件。与不同转录因子的活性相关的是转录共激活因子,可增强它们与基础转录机制的结合。尽管在转基因植物中已经证明了应激反应转录因子的重要性,但与非生物胁迫相关的转录共激活因子的功能知之甚少。在这里,我们报告在拟南芥(Arabidopsis thaliana)中应力响应转录共激活因子多蛋白桥连因子1c(MBF1c)的组成型表达增强了转基因植物对细菌感染,热和渗透胁迫的耐受性。此外,即使将这两种胁迫组合在一起,转基因植物对渗透胁迫和热胁迫的耐受性仍得以维持。 MBF1c在转基因植物中的表达增加了响应热胁迫的许多防御转录本的积累。转录组分析和抑制剂研究表明,MBF1c表达通过部分激活或干扰乙烯反应信号转导途径来增强转基因植物对热和渗透胁迫的耐受性。目前的发现表明MBF1蛋白可用于增强植物对不同非生物胁迫的耐受性。

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