Garcia-Daga Sebastian, Roy Stuart J, Gilliham Matthew
School of Agriculture, Food and Wine & Waite Research Institute, University of Adelaide, Urrbrae, SA 5064, Australia; School of Biosciences, University of Nottingham, Sutton Bonnington, LE12 5RD, UK; ARC Centre of Excellence in Plants for Space, University of Adelaide, Urrbrae, SA 5064, Australia.
School of Agriculture, Food and Wine & Waite Research Institute, University of Adelaide, Urrbrae, SA 5064, Australia; ARC Industrial Transformation Training Centre for Future Crops Development, University of Adelaide, Urrbrae, SA 5064, Australia.
Trends Plant Sci. 2025 Feb;30(2):137-146. doi: 10.1016/j.tplants.2024.10.002. Epub 2024 Oct 26.
Salt contamination of soils and irrigation water is a significant environmental concern for crop production. Leaf sodium (Na) exclusion is commonly proposed to be a key subtrait of salt tolerance for many crop plants. High-Affinity Potassium (K) Transporter 1 (HKT1) proteins have previously been identified as major controllers of leaf Na exclusion across diverse species. However, leaf Na exclusion does not always correlate with salt tolerance. We discuss literature which shows leaf Na accumulation can, in some circumstances, be tolerated without a detrimental effect on yield when HKT1 still functions to exclude Na from reproductive tissues. We conclude that, by having an ultimate role in the protection of reproductive performance, HKT1s' role in adaptation to salinity warrants redefinition.
土壤和灌溉水的盐分污染是作物生产中一个重大的环境问题。叶片钠（Na）排斥通常被认为是许多作物耐盐性的关键子性状。高亲和性钾（K）转运蛋白1（HKT1）此前已被确定为不同物种叶片Na排斥的主要调控因子。然而，叶片Na排斥并不总是与耐盐性相关。我们讨论了一些文献，这些文献表明，在某些情况下，当HKT1仍发挥作用将Na从生殖组织中排除时，叶片Na积累可以被容忍而不会对产量产生不利影响。我们得出结论，由于HKT1在保护生殖性能方面具有最终作用，其在适应盐度方面的作用值得重新定义。
