期刊
PLANT AND CELL PHYSIOLOGY
卷 58, 期 3, 页码 522-536出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcw231
关键词
K+/Na+ homeostasis; Na+/H+ antiporter; Nitrogen nutrition; Proton pump; Salt stress; Sorghum
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Instituto Nacional de Ciencia e Tecnologia em Salinidade (INCTSal)
An effective strategy for re-establishing K+ and Na+ homeostasis is a challenge for the improvement of plant performance in saline soil. Specifically, attempts to understand the mechanisms of Na+ extrusion from plant cells, the control of Na+ loading in the xylem and the partitioning of the accumulated Na+ between different plant organs are ongoing. Our goal was to provide insight into how an external nitrogen source affects Na+ accumulation in Sorghum bicolor under saline conditions. The NH4+ supply improved the salt tolerance of the plant by restricting Na+ accumulation and improving the K+/ Na+ homeostasis in shoots, which was consistent with the high activity and expression of Na+/ H+ antiporters and proton pumps in the plasma membrane and vacuoles in the roots, resulting in low Na+ loading in the xylem. Conversely, although NO3- grown plants had exclusion and sequestration mechanisms for Na+, these responses were not sufficient to reduce Na+ accumulation. In conclusion, NH4+ acts as an efficient signal to activate co-ordinately responses involved in the regulation of Na+ homeostasis in sorghum plants under salt stress, which leads to salt tolerance.
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