پیامد افزایش غلظت دی اکسیدکربن هوا بر جوانهزنی و رشد دانهرستهای گیاه نخود سیاه در شرایط تنش شوری

The rising concentrations of carbon dioxide, and increasing salinity stress, recently are the major challenges involving to production of most field crops. Therefore, this study aimed to investigate the characteristics of germination and seedling growth of black chickpea (Cicer arietinum L. var. Nigra) in different salinity levels (0, 40, 80, 120, 160 mM NaCl) and at two levels of ambient (360±50 µM) and enriched (700±50 µM) carbon dioxide. The experiment was conducted in a completely randomized design with four replications in a Research Greenhouse, Collage of Agriculture, Isfahan University of Technology, in 2013. The results showed that the percentage and rate of germination decreased exponentially with increasing NaCl salinity. The reduction threshold of 50% for seed germination was estimated by 281 mM NaCl. As well as the root length and root dry weight of seedling were decreased significantly (P˂0.001) and was reduced 58 and 70% in 160 mM NaCl compared to non-saline conditions, respectively. The dry weight and length of plumule were significantly affected by the interaction of salinity and the air concentration of carbon dioxide. The average shoot dry weight were 0.02 and 0.03 g plant-1 360 and 700 μM M-1 of carbon dioxide in the air, respectively. In general, it seems that carbon dioxide enrichment moderates salinity-induced effects. It was more considerable in less loss of shoot dry weight and plumule length under induced NaCl salinity.