The study of the effect of salinity stress on Chlorophyll content in species of Medicago and Onobrichis

This research was conducted to determine the more salinity tolerant species of Medicago sativa and Onobrichis sativa. Two genotypes selected for each species experiment was conducted based on a factorial design including five salinity levels of 0,100, 200, 300 and 400 mM Nacl and Cacl2 treatments.Data were recorded and analyzed for Chlorophyll (a) concentration (chl.a), Chlorophyll (b) concentration (chl.b) and total Chlorophyll(t) concentration (chl.t).The result of chlorophyllmetri revealed that there was a significant difference (P<0/01) between species, chl.a and chl.t‏‏. ‏Also, in the study of intraction between species and salinity Onobrichis in highest different‏ levels had the highest concentration of chlorophyll (a) and comparison diagrams shown that Onobrichis had the more resistance in compaire with medicago in all of salinity levels.