论文摘要
Under conditions of aluminum（Al） toxicity,which severely inhibits root growth in acidic soils, plants rapidly alter their gene expression to optimize physiological fitness for survival. Abscisic acid（ABA） has been suggested as a mediator between Al stress and gene expression, but the underlying mechanisms remain largely unknown. Here,we investigated ABA-mediated Al-stress responses, using integrated physiological and molecular biology approaches.We demonstrate that Al stress caused ABA accumulation in the root apex of rice bean（Vigna umbellata [Thunb.] Ohwi &Ohashi）, which positively regulated Al tolerance. However,this was not associated with known Al-tolerance mechanisms. Transcriptomic analysis revealed that nearly one-third of the responsive genes were shared between the Al-stress and ABA treatments. We further identified a transcription factor, ABI5, as being positively involved in Al tolerance. Arabidopsis abi5 mutants displayed increased sensitivity to Al, which was not related to the regulation of AtALMT1 and AtMATE expression. Functional categorization of ABI5-mediated genes revealed the importance of cell wall modification and osmoregulation in Al tolerance, a finding supported by osmotic stress treatment on Al tolerance. Our results suggest that ABA signal transduction pathways provide an additional layer of regulatory control over Al tolerance in plants.
论文目录
文章来源
类型: 期刊论文
作者: Wei Fan,Jia Meng Xu,Pei Wu,Zhi Xin Yang,He Qiang Lou,Wei Wei Chen,Jian Fen Jin,Shao Jian Zheng,Jian Li Yang
来源: Journal of Integrative Plant Biology 2019年02期
年度: 2019
分类: 基础科学,农业科技,工程科技Ⅰ辑
专业: 环境科学与资源利用,植物保护
单位: College of Resources and Environment, Yunan Agricultural University,State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University,Institute of Life Sciences, College of Life and Environmental Sciences, Hangzhou Normal University
基金: supported by the National Natural Science Foundation of China (31501827,31222049,31071849,and 31572193),National Basic Research Program of China (973 Program,2014CB441002),the Open Foundation for State Key Laboratory of Plant Physiology and Biochemistry,the Innovation Team for Farmland Non-pollution Production of Yunnan Province (2017HC015)
分类号: X503.231
页码: 140-154
总页数: 15
文件大小: 1156K
下载量: 27
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