Abstract: The stem explants of four potato cultivarswere used to induce calli and to screen salt-tolerant mutants in the medium containing different levels of NaCl. The results indicated that different cultivars showed different tolerance levels. To calli induction, the highest salt tolerant level is 018% for cv. Dongnong 303 and E1, 0.6% for cv. Favorite and 0.4% for cv. Shepody. Salt inhibited shoot and root differentiation. The salt-tolerant calli should be subcultured for notmore than 8 - 10 times. Salt tolerant tests in vivo and in vitro revealed that the mutants possessed salt tolerance.

Key words: Potato, Salt-tolerant mutant, Stem explants, Callus, Culture in vitro