Abstract: This study was done to investigate the effect of different level of NaCl concentration on the germination of Tephrosia purpurea L. seed. Different concentration of NaCl (50,100,200 and 300 mM) and distilled water (control) was experimented on the seed of this wild leguminous plant. The experiment showed that the mean germination time (MGT), germination index (GI), coefficient of velocity of germination (CVG), germination percentage (GP), and seed vigor index (SVI) varied from 1.7 to 3.5 days, 1.91 to 1.00, 0.28 to1.08, 60 to 80% and 0.40 to 4.06, respectively. There was no germination at 300 mM. Significant differences were found among NaCl treatments in terms of GI (p < 0.05), GP (p < 0.01), and SVI (p < 0.01). The plant showed positive response under treatment of 50mM NaCl concentration but beyond that it showed negative response in all examined parameters, except MGT. Maximum value of GI, GP, CVG, and SVI were observed at 50mM concentration and minimum at 200mM NaCl concentration. Pearson’s correlation coefficients between all parameters were calculated and we observed that MGT, GI, GP, CVG, and SVI were significantly related with each other.
Keywords: Wild legume, Salinity stress, Sodium chloride, Seed germination, Pearson’s correlation.