Does physicochemical pre-treatments can alleviate germination and dormancy of Sophora alopecuroides seeds?
Ali Asghar Aliloo* and Seyyed-Hamid Mustafavi
A factorial experiment in completely randomized design was conducted with three replications in 2012 at the University of Maragheh, Iran, to evaluate the different pre-treatments effects on germination of Sophora seeds. To release the physical dormancy, seeds were exposed to: mechanical scarification; sulfuric acid (65%) for 15 min; sulfuric acid (65%) for 30 min. To examine the existence of physiological dormancy, Seeds were tested with following solutions in the seed bed; distilled water; saturated soil extract solution ; KNO3 (34 mg\L); Gibberllic acid (20 ppm) and KNO3 (34 mg\L)+ GA3 (20 ppm). The results showed that Germination percentage (GP), Seedling fresh weight (SFW), Seedling dry weight (SDW), Grain fresh weight (GFW), Grain dry weight (GDW) and Resource remobilization (PM) were significantly affected by scarification treatments whereas the influence of media solutions on mentioned traits were not statistically significant. Among the scarification treatments, sulfuric acid (65%) for 30 min improved seed germination percentage from 2.22% to 81.66%. However, the rest treatments had a negligible effect on the germination percentage in comparison with control. Sulfuric acid scarification enhanced seedling properties and the highest values were obtained from sulfuric acid (65%) for 30 min. In conclusion, it seems that the primary control of germination in sophora seeds is located in the seed coats and scarification with sulfuric acid (65%) for 30 min can easily eliminate these limitations and seed dormancy.
Keywords: Dormancy, Germination, Seedling Growth, Scarification, Sophora