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植物耐热性及热激信号转导机制研究进展

DOI: 10.1360/052013-310, PP. 1072-1081

Keywords: 耐热性,热激信号,热激转录因子,热激蛋白,信号转导,膜稳定性

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Abstract:

随着温室效应的加剧,全球气候变暖已经成为现代农业生产体系所面临的严峻挑战.高温灾害性气候是影响作物产量的一种主要的非生物胁迫.因此,对于农作物生产而言,研究植物耐热信号转导机制不仅有重要的科学意义,而且有现实的紧迫性.最近几年,在阐明植物耐热信号转导机制的研究方面取得了很多重要的进展,这些进展涵盖植物高温胁迫的感受机制、热激转录因子和热激蛋白的表达调控、热激转录因子结合蛋白参与耐热性调控的分子机制等几个主要的方面.热胁迫影响细胞膜系统、RNA、蛋白质的稳定性,同时改变酶的活性和细胞骨架系统.当热胁迫来临时,植物的转录组会发生显著变化,所涉及的基因大约占基因组的2%.这些高温胁迫响应基因构成了热激响应网络,是植物抵御热胁迫的第一道防线.植物的耐热性分为基础耐热性和获得性耐热性.基础耐热性是植物固有的耐热性.获得性耐热性是温和的热驯化诱导的耐热性.获得性耐热性状的形成反映了植物在自然生长环境下适应高温胁迫的生理机制.

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