واكنش جوانه زني و رشد گياهچه به تنش شوري در 24 ژنوتيپ نخود خشك ايراني (Cicer arietinum L)

Response of Germination and Seedling Growth of Twenty- Four Genotypes of Chickpea (Cicer arietinum L.) to Salt Stress

This experiment was conducted to study the effect of NaCl salinity during germination and seedling growth of twenty-four chickpea genotypes in greenhouse conditions. The study was conducted as a factorial experiment with 3 replications in completely randomized design at three steps. The first step was germination test (0, 50 and 100 mM) the second was screening test (0, 40, 60, 80 and 100 mM) and finally , the morphological and physiological traits were studied (0, 30, 60 and 90mM). The results of germination rate (GR) and final germination percentage (FGP) showed that FLIP95-64C genotype and FLIP82-150C had maximum and minimum germinations, respectively. All the genotypes had emerged up to 76% at 50 mM NaCl/L. The screening results indicated that FLIP95-50C had the highest tolerance to salt stress (EC-4.32ds/m) and the lowest salt tolerance related to FLIP95-57C and FLIP93-174C (EC=1.02ds/m). The results of the third section of experiment showed that seedlings weight decreased by increasing the salinity but the more sensitive genotype (FLIP 95-57C) was affected adversely by NaCl. In addition, tolerance genotype had longer length of rootlets. The results also indicated that concentrations of Na and CI ions were lower in tolerant genotypes than in the sensitive one. This may serve to believe that tolerance genotype of chickpea contains a mechanism which can exclude toxic ions. Finally, the results showed that plant responses to salinity were different at germination and seedling stages.