Inhibitory Effects of Plumbum （Pb） Stress on Seed Germination and Seedling Growth of Mung Bean

In order to investigate the inhibition effect of heavy metals on seed germination and seedling growth, mung bean seeds were cultured in lead solution with different concentrations(10.0, 20.0, 50.0, 100.0, 200.0 mg·kg^-1)（distilled water as control）, and the effects of lead stress on seed germination, seedling growth and seed vigor were also observed. The results showed that the germination rate, germination potential, root length, bud length and seedling fresh weight of mung bean seeds decreased with the increase of Pb²⁺ concentration. In addition, seed vigor and root-shoot ratio（R/S） of mung bean seedlings were also significantly decreased with the increase of lead ion concentration. According to the comprehensive analysis of the response level of mung bean seedling growth to lead stress, the results showed that the inhibition effect of heavy metal lead stress on root length of mung bean seedling was stronger than the effect on bud growth.