Molecular mechanisms of potassium and sodium uptake in plants

被引:176
作者
Mäser, P
Gierth, M
Schroeder, JI
机构
[1] Univ Calif San Diego, Cell & Dev Biol Sect, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Ctr Mol Genet, Div Biol, La Jolla, CA 92093 USA
基金
美国国家科学基金会;
关键词
Arabidopsis thaliana; ion transport; potassium; salt sensitivity; sodium;
D O I
10.1023/A:1021159130729
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Potassium (K+) is an essential nutrient and the most abundant cation in plants, whereas the closely related ion sodium (Na+) is toxic to most plants at high millimolar concentrations. K+ deficiency and Na+ toxicity are both major constraints to crop production worldwide. K+ counteracts Na+ stress, while Na+, in turn, can to a certain degree alleviate K+ deficiency. Elucidation of the molecular mechanisms of K+ and Na+ transport is pivotal to the understanding - and eventually engineering - of plant K+ nutrition and Na+ sensitivity. Here we provide an overview on plant K+ transporters with particular emphasis on root K+ and Na+ uptake. Plant K+-permeable cation transporters comprise seven families: Shaker-type K+ channels, 'two-pore' K+ channels, cyclic-nucleotide-gated channels, putative K+/H+ antiporters, KUP/HAK/KT transporters, HKT transporters, and LCT1. Candidate genes for Na+ transport are the KUP/HAK/KTs, HKTs, CNGCs, and LCT1. Expression in heterologous systems, localization in plants, and genetic disruption in plants will provide insight into the roles of transporter genes in K+ nutrition and Na+ toxicity.
引用
收藏
页码:43 / 54
页数:12
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