تعيين تحمل به شوري كلرو سديمي در دانهان هاي چند رقم

DETERMINATION OF SODIUM CHLORIDE TOLERANCE IN SEEDLINGS OF SOME ALMOND CULTIVARS

The effects of salinity on growth characteristics and amount of minerals content of seedlings of four almond cultivars (ʹAzarʹ, ʹSahandʹ, ʹShkoofehʹ and ʹNon Pareilʹ) were studied using a randomized complete block design with five replications. After stratification, the seeds were planted in pots containing perlite and then were cultured under greenhouse conditions. After one month, seedlings were kept under salinity stress with 0, 50 and 100 mM NaC1. At the end of salinity treatments, final length of stem. leaf area, total dry and fresh weight of plant, dry and fresh weight of shoot and root, and Na, Ca, K. Mg and Cl contents in stem were measured. The results showed that the salinity stress reduced the stem length, leaf area. total dry and fresh weight of plant and dry and fresh shoot weight in all cultivars according the NaCI levels, so that. most reduction in growth characteristics was with 100 mM NaC1 Salinity levels increased stem Na and Cl contents and Na/K ratio in all cultivars, but had no effects on Ca , K and Mg contents. ʹSahandʹ had low Na and high K contents in comparison with others and had also lower Na/K ratio. The studied cultivars did not significantly affected Cl, K and Ca contents in stem but not Mg. ʹNon Pareilʹ had a more stem Mg content in comparison with others.