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作 者:李书粉[1] 孙富丛[1] 肖理慧[1] 高武军[1] 卢龙斗[1]
机构地区:[1]河南师范大学生命科学学院,河南新乡453007
出 处:《西北植物学报》2006年第6期1295-1300,共6页Acta Botanica Boreali-Occidentalia Sinica
基 金:河南省科技攻关项目(2004180004);河南师范大学青年基金项目(20040011)
摘 要:植物对非生物胁迫的应答反应涉及到许多基因和生化分子机制,胁迫相关基因、蛋白质及代谢物构成了一个复杂的调控网络,其中转录控制具有举足轻重的作用。本文主要对近年来发现的几种在转录控制中起关键作用的转录因子CBF/DREB、bZIP、MYB/MYC和HSF及其调控机制进行介绍。这几种转录因子可以分别和胁迫应答顺式作用元件CRT/DRE、ABRE、MYB/MYC识别位点及HSE结合,在非生物胁迫条件下调控下游靶基因的表达,进而使一些胁迫保护物质如脯氨酸、可溶性糖类、自由基的清除剂、热休克蛋白和分子伴侣等的表达水平升高,最终增强植物对非生物胁迫的耐受能力。Plant responses to abiotic stresses involve many genes and biochemical molecular mechanisms and stress-associated genes, proteins and metabolites form a complicated regulation network in which transcription control plays a balance-holding role. The paper mainly introduces several transcriptional factors which have been found in recent years and which play a key role in transcription control, CBF/DREB, bZIP,MYB/MYC and HSF,and their regulation mechanisms. These transcriptional factors can separately combine with the stress-responsive cis-acting elements CRT/DRE,ABRE,MYB/MYC at their recognition sites and HSE to regulate the expressions of downstream target genes under abiotic stresses ,then raise the expression levels of some stress-fighting substances such as proline ,soluble sugar,reactive oxygen species scavengers, heat shock protein and molecular chaperones, and finally enhance plant tolerance to abiotic stresses.
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