Due to the prevalence of an arid and semi-arid climate, Iran ’ s soil and water resources are prone to salinity. Wheat is a major staple crop that its grain yield is limited by environmental stresses, in general, and salt stress, in particular. Wheat ancestors and relatives are valuable genetic resources for improving grain yield and its stability under environmental constrains. This research was aimed at studying physiological responses and dry mass of ten genotypes, consisting tetra and hexaploid wheats (each level of ploidy consisting of hulled and naked types of wheat), where group-wise comparisons were conducted to dissect potent differential responses of wheat groups to salinity. A 3-replicate factorial randomized complete block design pot experiment was conducted in the Isfahan University of Technology (Latitude 32? 43 ' , Longitude 51? 31 ' and Altitude 1659 m above sea level). Three levels of irrigation water salinity (0, 60 and 120 mM of NaCl) were applied to the ten genotypes. Salinity led to decreases in net photosynthetic rate, stomatal conductance, trairation rate, sub-stomatal CO 2 concentration, chlorophyll a and b and carotenoids concentrations, root, stem, leaf sheath and blade K + concentrations, root fresh and dry weights and volume and shoot fresh and dry weights. However, salinity led to increases in photosynthetic water use efficiency, proline concentration, minimum and maximum fluorescence, and root, stem, leaf sheath and blade Na + concentrations, Na + /K + of root, stem, leaf sheath and blade. Among all genotypes studied, hulled tetraploid group, in general, and Iranian emmer group, in particular, exhibited a greater dry mass stability, compared to both tetra and hexaploid naked groups of wheat, when exposed to 120 mM of NaCl. Interestingly, Iranian emmer group of wheats indicated such stability, despite greater Na + concentration and Na + /K + ratio in the root, stem, leaf sheath and blade under saline condition. Keywords: salt stress, hulled wheats, ploid levels.