Notulae Botanicae Horti Agrobotanici Cluj-Napoca, cilt.54, sa.1, ss.14910, 2026 (SCI-Expanded, Scopus)
Salinity negatively affects plant growth by inhibiting germination, emergence, yield, and quality; therefore, it is important to select salt-tolerant plants. This study aimed to determine the tolerance of white mustard (Sinapis alba L.) to salinity by evaluating morphological, physiological, and stomata properties. In this study, three white mustard genotypes (WM1, WM2, and WM3) were exposed to five NaCl concentrations (0, 50, 100, 150, and 200 mM) under controlled conditions. The results showed that increasing salinity significantly reduced plant height, biomass, and dry matter content of white mustard genotypes. Salinity caused a reduction in plant height by 42%, plant fresh weight by 51%, and cell membrane stability by 38%. However, the genotypes showed different responses to increasing salinity. WM3 consistently exhibited superior tolerance, as reflected by its higher biomass, relative water content, and cell membrane stability reflecting superior tolerance. Stomata parameters were strongly affected by salinity, with increased number, size, and area of stomata, particularly at 100 mM NaCl. The results demonstrated that white mustard could tolerate salinity up to 100 mM NaCl, depending on the genotype. WM1 was superior until 150 mM NaCl, while WM3 showed the most effective morphological adaptation by regulating physiological traits. These results highlighted that WM3 was a highly salt-tolerant genotype and could be a valuable genetic resource for future breeding and stress management programs in saline environments.