Natural variations in SlSOS1 contribute to the loss of salt tolerance during tomato domestication
Shi, Huazhong Shi
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Soil salinity is a major constraint on crop cultivability and productivity worldwide (Shabala, 2013). The ion toxicity caused by high salinity is alleviated by the adjustment of cellular Na+ and K+ homeostasis through the functions of ion transporters such as SOS1 (Salt Overly Sensitive 1) and HKT1 (High-Affinity Potassium Transporter 1). SOS1 is a plasma membrane Na+/H+ antiporter mediating Na+ extrusion in root epidermal cells to reduce Na+ accumulation in plants and in the parenchyma cells of root and shoot xylems to promote Na+ translocation from root to shoot, whereas the Na+ transporter HKT1 mediates retrieval of Na+ from the xylem and may contribute to Na+ recirculation from shoot to root (Zhu, 2016). Natural variations in HKT1 have been implicated in salt tolerance in several plant species (An et al., 2017). However, the role of natural variations in SOS1 in adaptation to salt stress has not been reported.