There are very few species that have a high tolerance of salt, thus the idea, although good, has a limited range of uses. If you wanted to transfer the salt res

There are very few species that have a high tolerance of salt, thus the idea, although good, has a limited range of uses. If you wanted to transfer the salt resistance of a potato to a lettuce you would need to use DNA splicing, making it a GMO. Also, it is true that most of the salt is retain on the leaf, but a good portion remains on the soil as small crystals, accelerating erosion of the field.