The twins K+ and Na+ in plants

被引：203

作者：

Benito, Begona ^{[1
]}

Haro, Rosario ^{[1
]}

Amtmann, Anna ^{[2
]}

Cuin, Tracey Ann ^{[3
]}

Dreyer, Ingo ^{[1
]}

机构：

[1] Univ Politecn Madrid, Ctr Biotecnol & Genom Plantas, Madrid, Spain

[2] Univ Glasgow, Coll Med Vet & Life Sci MVLS, Inst Mol Cellular & Syst Biol MCSB, Glasgow, Lanark, Scotland

[3] Univ Montpellier 2, UMR 5004, CNRS UMR 0386, Inst Biol Integrat Plantes,INRA,Montpellier SupAg, Montpellier, France

来源：

JOURNAL OF PLANT PHYSIOLOGY | 2014年 / 171卷 / 09期

关键词：

HKT; Potassium; Sodium; Transport mechanism; POTASSIUM CHANNEL; HKT TRANSPORTERS; SALINITY TOLERANCE; SODIUM-TRANSPORT; SALT-TOLERANT; CATION SELECTIVITY; CRYSTAL-STRUCTURE; MOLECULAR-BASIS; RICE OSHKT2/1; ION CHANNELS;

D O I：

10.1016/j.jplph.2013.10.014

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

In the earth's crust and in seawater, K+ and Na+ are by far the most available monovalent inorganic cations. Physico-chemically, K+ and Na+ are very similar, but K+ is widely used by plants whereas Na+ can easily reach toxic levels. Indeed, salinity is one of the major and growing threats to agricultural production. In this article, we outline the fundamental bases for the differences between Na+ and K+. We present the foundation of transporter selectivity and summarize findings on transporters of the HKT type, which are reported to transport Na+ and/or Na+ and K+, and may play a central role in Na+ utilization and detoxification in plants. Based on the structural differences in the hydration shells of K+ and Na+, and by comparison with sodium channels, we present an ad hoc mechanistic model that can account for ion permeation through HKTs. (C) 2013 Elsevier GmbH. All rights reserved.

引用

页码：723 / 731

页数：9

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