3.3.4. Changes in the SI of Root Number (SIRN)

About half of the breeding lines responded with decreased SIRN values to 0.1 M D-mannitol treatment (Table 13, Figure S12a). Some breeding lines showed significantly increased SIRN values compared to both referent lines. In general, decreasing tendencies could be observed in SIRN values as D-mannitol level increased (0.2 M), and significant reductions were verified in the majority of breeding lines. SIRN values increased in some breeding lines. There were significant differences between C103 and C107 when 0.1 M and 0.2 M D-mannitol concentrations were applied to the medium. In addition, four, eleven and nine breeding lines showed significantly higher SIRN values compared to both referent lines at the levels of 0.1, 0.2 and 0.3 M D-mannitol, respectively (Table 13, Figure S12a–c).

**Table 13.** Root number SI (SIRN) 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.



**Table 13.** *Cont.*

Symbols mark significant differences from the C107 referent line (-), or from the C103 referent line () 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.
