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Gain-of-function mutations of AtNHX1 suppress sos1 salt sensitivity and improve salt tolerance in Arabidopsis

Stress Biology 2021年第1期1卷 170-188页

作者： Isaiah Catalino M.Pabuayon Jiafu Jiang Hongjia Qian Jung-Sung Chung Huazhong Shi Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTX 79424USA Current address:State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsKey Laboratory of Biology of Ornamental Plants in East ChinaNational Forestry and Grassland AdministrationCollege of HorticultureNanjing Agricultural UniversityNanjing 210095China Current address:Department of Agronomy Gyeongsang National UniversityJinju 52828South Korea

Soil salinity severely hampers agricultural *** salt stress,excess Na+accumulation causes cellular damage and plant growth retardation,and membrane Na+transporters play central roles in Na+uptake and exclusion to mitigate these adverse *** this study,we performed sos1 suppressor mutant(named sup)screening to uncover potential genetic interactors of sos1 and additional salt tolerance ***-based cloning and sequencing identified a group of mutants harboring dominant gain-of-function mutations in the vacuolar Na+/H+antiporter gene *** gain-of-function variants of AtNHX1 showed enhanced transporter activities in yeast cells and increased salt tolerance in Arabidopsis wild type *** content measurements indicated that at the cellular level,these gain-of-function mutations resulted in increased cellular Na+accumulation likely due to enhanced vacuolar Na+***,the gain-of-function suppressor mutants showed reduced shoot Na+but increased root Na+accumulation under salt stress,indicating a role of AtNHX1 in limiting Na+translocation from root to *** also identified another group of sos1 suppressors with loss-of-function mutations in the Na+transporter gene ***-of-function mutations in AtHKT1 and gain-of-function mutations in AtNHX1 additively suppressed sos1 salt sensitivity,which indicates that the three transporters,sos1,AtNHX1 and AtHKT1 function independently but coordinately in controlling Na+homeostasis and salt tolerance in *** findings provide valuable information about the target amino acids in NHX1 for gene editing to improve salt tolerance in crops.

关键词： sos1 suppressor AtHKT1 AtNHX1 Gain-of-function Salt tolerance

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