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Rice potassium transporter O s HAK 1 is essential for maintaining potassium‐mediated growth and functions in salt tolerance over low and high potassium concentration ranges
Author(s) -
Chen Guang,
Hu Qingdi,
Luo Le,
Yang Tianyuan,
Zhang Song,
Hu Yibing,
Yu Ling,
Xu Guohua
Publication year - 2015
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12585
Subject(s) - potassium , salt (chemistry) , chemistry , transporter , potassium deficiency , agronomy , biology , biochemistry , organic chemistry , gene
Potassium ( K ) absorption and translocation in plants rely upon multiple K transporters for adapting varied K supply and saline conditions. Here, we report the expression patterns and physiological roles of OsHAK1 , a member belonging to the KT / KUP / HAK gene family in rice ( O ryza sativa L. ). The expression of OsHAK1 is up‐regulated by K deficiency or salt stress in various tissues, particularly in the root and shoot apical meristem, the epidermises and steles of root, and vascular bundles of shoot. Both oshak1 knockout mutants in comparison to their respective Dongjin or Manan wild types showed a dramatic reduction in K concentration and stunted root and shoot growth. Knockout of OsHAK1 reduced the K absorption rate of unit root surface area by ∼50–55 and ∼30%, and total K uptake by ∼80 and ∼65% at 0.05–0.1 and 1 m m K supply level, respectively. The root net high‐affinity K uptake of oshak1 mutants was sensitive to salt stress but not to ammonium supply. Overexpression of OsHAK1 in rice increased K uptake and K / N a ratio. The positive relationship between K concentration and shoot biomass in the mutants suggests that OsHAK1 plays an essential role in K ‐mediated rice growth and salt tolerance over low and high K concentration ranges.