A conserved primary salt tolerance mechanism mediated by HKT transporters: a mechanism for sodium exclusion and maintenance of high K+/Na+ ratio in leaves during salinity stress

被引:392
作者
Hauser, Felix [1 ,2 ]
Horie, Tomoaki [3 ]
机构
[1] Univ Calif San Diego, Div Biol Sci, Cell & Dev Biol Sect, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Ctr Mol Genet, La Jolla, CA 92093 USA
[3] Okayama Univ, Grp Mol & Funct Plant Biol, Bioresources Res Inst, Okayama 7100046, Japan
关键词
HKT; ion homeostasis; K plus transport; Na plus toxicity; Na plus transport; salt tolerance; HIGH-AFFINITY POTASSIUM; DNA INSERTIONAL MUTAGENESIS; XYLEM PARENCHYMA CELLS; NA+ TRANSPORT; ARABIDOPSIS-THALIANA; BARLEY ROOTS; KEY DETERMINANTS; GLYCINE RESIDUES; WATER TRANSPORT; ION HOMEOSTASIS;
D O I
10.1111/j.1365-3040.2009.02056.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Increasing soil salinity is a serious threat to agricultural productions worldwide in the 21st century. Several essential Na+ transporters such as AtNHX1 and AtSOS1 function in Na+ tolerance under salinity stress in plants. Recently, evidence for a new primary salt tolerance mechanism has been reported, which is mediated by a class of HKT transporters both in dicots such as Arabidopsis and monocot crops such as rice and wheat. Here we present a review on vital physiological functions of HKT transporters including AtHKT1;1 and OsHKT1;5 in preventing shoot Na+ over-accumulation by mediating Na+ exclusion from xylem vessels in the presence of a large amount of Na+ thereby protecting leaves from salinity stress. Findings of the HKT2 transporter sub-family are also updated in this review. Subjects regarding function and regulation of HKT transporters, which need to be elucidated in future research, are discussed.
引用
收藏
页码:552 / 565
页数:14
相关论文
共 102 条
[31]   A simple, fast, and accurate algorithm to estimate large phylogenies by maximum likelihood [J].
Guindon, S ;
Gascuel, O .
SYSTEMATIC BIOLOGY, 2003, 52 (05) :696-704
[32]   EFFECT OF SALT ON PROTEIN-SYNTHESIS IN HALOPHYTE SUAEDA-MARITIMA [J].
HALL, JL ;
FLOWERS, TJ .
PLANTA, 1973, 110 (04) :361-368
[33]   HKT1 mediates sodium uniport in roots.: Pitfalls in the expression of HKT1 in yeast [J].
Haro, R ;
Bañuelos, MA ;
Senn, MAE ;
Barrero-Gil, J ;
Rodríguez-Navarro, A .
PLANT PHYSIOLOGY, 2005, 139 (03) :1495-1506
[34]   Plant cellular and molecular responses to high salinity [J].
Hasegawa, PM ;
Bressan, RA ;
Zhu, JK ;
Bohnert, HJ .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 2000, 51 :463-499
[35]  
Haseloff J, 1999, METHOD CELL BIOL, V58, P139
[36]   Retrotransposons of rice involved in mutations induced by tissue culture [J].
Hirochika, H ;
Sugimoto, K ;
Otsuki, Y ;
Tsugawa, H ;
Kanda, M .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1996, 93 (15) :7783-7788
[37]   Two types of HKT transporters with different properties of Na+ and K+ transport in Oryza sativa [J].
Horie, T ;
Yoshida, K ;
Nakayama, H ;
Yamada, K ;
Oiki, S ;
Shinmyo, A .
PLANT JOURNAL, 2001, 27 (02) :129-138
[38]   Sodium transporters in plants. Diverse genes and physiological functions [J].
Horie, T ;
Schroeder, JI .
PLANT PHYSIOLOGY, 2004, 136 (01) :2457-2462
[39]  
HORIE T, 2009, TRENDS PLAN IN PRESS
[40]   Rice OsHKT2;1 transporter mediates large Na+ influx component into K+-starved roots for growth [J].
Horie, Tomoaki ;
Costa, Alex ;
Kim, Tae Houn ;
Han, Min Jung ;
Horie, Rie ;
Leung, Ho-Yin ;
Miyao, Akio ;
Hirochika, Hirohiko ;
An, Gynheung ;
Schroeder, Julian I. .
EMBO JOURNAL, 2007, 26 (12) :3003-3014