The objective was to evaluate physiological parameters as possible methods for assessing salinity stress in cotton. The parameters tested were leaf temperature, membrane permeability of leaf cells, stem growth, and fresh weight production of various plant parts. The experiment was done under greenhouse conditions. The exotic cotton strains T25, T55, T153, and T169 in solution culture in the absence and 150 mM NaCl, respectively. Salinization began at day 16 from transplanting the seedlings cultures were salinized in increments times per week so that the cultures 23 and 150 mM NaCl at day 30. Final from transplanting.