Increasing soil salinization seriously impairs plant growth and development, resulting in crop loss. The Salt-Overly-Sensitive (SOS) pathway is indispensable to the mitigation of Na toxicity in plants under high salinity. However, whether natural variations of contribute to salt tolerance has not been reported. Here a natural variation in the promoter region was identified to be associated with root Na/K ratio and the loss of salt resistance during tomato domestication. This natural variation contains an ABI4-binding -element and plays an important role in the repression of expression. Genetic evidence revealed that mutations increase root Na/K ratio under salt stress conditions and thus attenuate salt resistance in tomato. Together, our findings uncovered a critical but previously unknown natural variation of in salt resistance, which provides valuable natural resources for genetic breeding for salt resistance in cultivated tomatoes and other crops.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9832868 | PMC |
| http://dx.doi.org/10.1093/hr/uhac244 | DOI Listing |
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