Different Responses of Seed Germination of Two Beans Under Treatment by Cd~(2+)

Different responses of seed germination physiology in mung bean and common vetch towards Cd2+ treatment were conducted with an experiment. It has been found that little effects were found for germinating rate, indexes of seed mung bean and common vetch, but vitality index of seeds were done by Cd2+ treatment at lower concentration(equal to or lower than 50 μ mol· L- 1 for mung bean; equal to or lower than 100 μ mol· L- 1 for common vetch) and germinating rates, indexes and vitality indexes of seeds of mung bean and common vetch were significantly affected by Cd2+ treatment at higher concentration. All of the above related to the decreases of proteolytic enzyme activity and respiratory rate and the increase of plasma membrane permeability. Compared with mung bean, there was less effect of Cd2+ treatment on the seed germination of common vetch. This may be suggested that the resistance of germinating seed against Cd2+ stress be stronger than that of mung bean.