Saline-alkaline stress is a worldwide problem that threatens the growth and yield of crops. However, how crops adapt to saline-alkaline stress remains less studied. Here we show that saline-alkaline tolerance was compromised during tomato domestication and improvement, and a natural variation in the promoter of , an EF-hand Ca binding protein, contributed to the loss of saline-alkaline tolerance during tomato improvement. The biochemical and genetic data showed that is a positive regulator of saline-alkaline tolerance in tomato. The introgression line Pi-75, derived from a cross between wild LA1589 and cultivar E6203, containing the locus, showed stronger saline-alkaline tolerance than E6203. Pi-75 and LA1589 also showed enhanced saline-alkaline-induced expression than that of E6203. By sequence analysis, a natural variation was found in the promoter of and the accessions with the wild haplotype showed enhanced saline-alkaline tolerance compared with the cultivar haplotype. Our studies clarify the mechanism of saline-alkaline tolerance conferred by and provide an important natural variation in the promoter of for tomato breeding.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11040208 | PMC |
| http://dx.doi.org/10.1093/hr/uhae055 | DOI Listing |
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