期刊
PLANT CELL AND ENVIRONMENT
卷 38, 期 12, 页码 2747-2765出版社
WILEY
DOI: 10.1111/pce.12585
关键词
Oryza sativa; potassium homeostasis; potassium acquisition; potassium transportation
资金
- National Natural Science Foundation [31361140357]
- National R&D Program for Transgenic Crops
- Fundamental Research Funds for the Central Universities [KYTZ201404]
- 111 Project [12009]
- Innovative Research Team Development Plan of the Ministry of Education of China
- PAPD of Jiangsu Higher Education Institutions Project
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 (Oryza sativaL.). 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 approximate to 50-55 and approximate to 30%, and total K uptake by approximate to 80 and approximate to 65% at 0.05-0.1 and 1mm 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/Na 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.
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