ROS-mediated vascular homeostatic control of root-to-shoot soil Na delivery in Arabidopsis

被引：151
作者：
Jiang, Caifu [1 ]
Belfield, Eric J. [1 ]
Mithani, Aziz [1 ,2 ]
Visscher, Anne [1 ]
Ragoussis, Jiannis [3 ]
Mott, Richard [3 ]
Smith, J. Andrew C. [1 ]
Harberd, Nicholas P. [1 ]
机构：
[1] Univ Oxford, Dept Plant Sci, Oxford OX1 3RB, England
[2] Lahore Univ Management Sci, Dept Biol, Syed Babar Ali Sch Sci & Engn, Sect U,DHA, Lahore, Pakistan
[3] Univ Oxford, Wellcome Trust Ctr Human Genet, Oxford OX1 3RB, England
来源：
EMBO JOURNAL | 2012年 / 31卷 / 22期
基金：
英国生物技术与生命科学研究理事会; 英国惠康基金;
关键词：
Arabidopsis; Na homeostasis; NADPH oxidase; ROS; salt tolerance; NADPH OXIDASE ATRBOHD; SALT TOLERANCE; SALINITY TOLERANCE; MUTANTS DEFICIENT; PROTEIN-KINASE; CELL-DEATH; OXYGEN; STRESS; TRANSPORT; SOS1;
D O I：
10.1038/emboj.2012.273
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Sodium (Na) is ubiquitous in soils, and is transported to plant shoots via transpiration through xylem elements in the vascular tissue. However, excess Na is damaging. Accordingly, control of xylem-sap Na concentration is important for maintenance of shoot Na homeostasis, especially under Na stress conditions. Here we report that shoot Na homeostasis of Arabidopsis thaliana plants grown in saline soils is conferred by reactive oxygen species (ROS) regulation of xylem-sap Na concentrations. We show that lack of A. thaliana respiratory burst oxidase protein F (AtrbohF; an NADPH oxidase catalysing ROS production) causes hypersensitivity of shoots to soil salinity. Lack of AtrbohF-dependent salinity-induced vascular ROS accumulation leads to increased Na concentrations in root vasculature cells and in xylem sap, thus causing delivery of damaging amounts of Na to the shoot. We also show that the excess shoot Na delivery caused by lack of AtrbohF is dependent upon transpiration. We conclude that AtrbohF increases ROS levels in wild-type root vasculature in response to raised soil salinity, thereby limiting Na concentrations in xylem sap, and in turn protecting shoot cells from transpiration-dependent delivery of excess Na. The EMBO Journal (2012) 31, 4359-4370. doi:10.1038/emboj.2012.273; Published online 12 October 2012
引用
收藏
页码：4359 / 4370
页数：12
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