Paper Title
Evaluation of Most Effective Parameters on Dry Matter of Mint Ecotypes under Sodium Chloride Stress using by Stepwise Regression Model

Abstract
Mint is one of the most important medicinal plants that has numerous properties to maintain human health. Salinity is one of the important stresses that limiting plant growth. To investigate the most effective traits on dry weight of mint ecotypes under salinity stress, an experiment with 18 different mint ecotypes under salinity stress (non-stress and 7.5 dS/m) was performed in greenhouse conditions. The results of stepwise regression analysis in control treatment showed that thechlorophyll a trait had high effect on dry weight. Otherwise, in 7.5 dS/m stress level chlorophyll b, total chlorophyll, chlorophyll a/b and carotenoid contentplay an important role to produce of dry matter in different mint ecotypes. Keywords - Mint, Stepwise Regression, Dry Weight, Salt Stress.