Journal
PLANT CELL AND ENVIRONMENT
Volume 33, Issue 4, Pages 552-565Publisher
WILEY
DOI: 10.1111/j.1365-3040.2009.02056.x
Keywords
HKT; ion homeostasis; K plus transport; Na plus toxicity; Na plus transport; salt tolerance
Categories
Funding
- US Department of Energy [DOE-DE-FG02-03ER15449]
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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.
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