تاثير شوري و خشكي بر جوانه زني و رشد گياهچه دو رقم پنبه

Effects of Salinity and Drought Stresses on Germination and Seedling Growth of Two Cotton Cultivars

In order to investigate the effects of drought and salinity on germination and seedling growth in cotton, two experiments were carried out with two commercial cotton cultivars, Sahel and Bakhtegan. Experimental design was factorial with completely randomized design using 3 replications. Drought and salinity treatments were 0, -1, -2, -4, -6, -8 and -10 bars and were regulated using PEG 6000, and sodium chloride respectively. Results of variance analysis and means comparison idicated that percentage and rate of seed germination and percentage of normal seedlings were increased by increasing of both salinity and drought levels. However, length of rootlets increased up to-2 drought bars. The results also indicated that Bakhtegan cv. Had better tolerance to salinity stress than Sahel cv., but in drought condition its tolerance and germination rate were less than Sahel. In general, the both cultivars had better performance in salinity stress than in drought stress.