3.3.2. Changes in the SI of Shoot Length (SISL)

The presence of D-mannitol at a concentration of 0.1 M in medium inhibited the shoot growth of almost all genotypes, and in general, SISL values decreased significantly with increasing D-mannitol concentration (Table 11, Figure S10a–c). The SISL value of the C12 line was higher than 100 in the treatment with 0.1 M D-mannitol, and 13 breeding lines achieved significantly higher SISL values than both referent lines. Similarly, at 0.2 M and 0.3 M levels of D-mannitol, the SISL values of several breeding lines were significantly higher than those of the referent lines.

**Table 11.** Shoot length SI (SISL) values of potato genotypes under stress treatment induced by D-mannitol added to the medium at levels of 0.1 M, 0.2 M and 0.3 M.


Symbols mark significant difference from the C107 referent line (-), or from the C103 referent lines () according to LSD test; the small letters indicate significantly different means between the breeding lines within a treatment, and the capital letters indicate significantly different means between treatment levels within a breeding line according to Tukey-B test.
