تاثير سطوح متفاوت شوري در انباشتگي يونها و جذب ازت در گونه هاي FESTUCA ARUNDINACEA, LOLIUM PERENNE, LOLIUM MULTIFLORUM

The relationship between ions accumulation and nitrogen assimilation with salt tolerance in Lolium multiflorum, L. perenne and Festuca arundinacea

The effect of four levels of salinity (0, 50, 100 and 150 mM NaCI) on growth, ions accumulation and nitrogen assimilation in three grasses "Lolium multiflorum, "Lolium perenne and Festuca arundinacea" was studied. Festuca was found to be more resistant than Lolium species. The high concentration of Na+was not observed in shoots of F. arundinacea. Also, the decrease in K+/Na + ratios were more severe in lolium species than F. arundinacea. The total - N and No3" -N concentration decreased drastically in lolium species due to salinity. However, such an effect was observed only at 150 mM NaCI in F. arundinacea. The NH4+ -N concentration was increased in all species under salinity, the results indicate that Na+ exclusion probably rescued the festuca plant from severe stress while in the lolium species such a resistance mechanism was not established. Our results suggested that there exist potential to utilize festuca in pastureland management in saline areas.