اثر القاء تنش شوری با کلرید سدیم بر صفات جوانه‌زنی دو گونهAgropyron trichophorum (Link) K. Richter و Agropyron pectiniforme Römer et J.A. Schultes

Salinity stress is considered as one of the major factors that reduce plant growth in many regions in the world. Agropyron pectiniforme and Agropyron trichophorum species are perennial grasses species that product valuable forage and grazing material in pasture and rangelands of Iran. The aim of this study was determining effect of salinity stress with NaCl on seed germination traits of Ag. pectiniforme and Ag. trichophorum species. The experimental design was a two factorial (species treatments and salinity levels or salt stress 0, 50, 150, 250 mM NaCl) arranged in a completely randomized design with three replicates and 50 seeds per replicate. The data were statistically analysed by the MSTAT-C, computer program. The difference between the means was compared using Duncan test (P< 0.05). Results showed that increasing the salinity caused significant decreases in the seed vigor index, germination percentage, root length and shoot length of Ag. pectiniforme and Ag. trichophorum species. Results of mean comparison showed that the highest values of germination percentage, rate germination, seed vigor index, shoot length, root length in different salinity levels were related to Ag. trichophorum. In general salinity treatments with higher 50 mM NaCl had negative effect on germination traits of Ag. pectiniforme and Ag. &nbsp;trichophorum species.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;