关键词: 白花蛇舌草, 水培, Cd污染, Pb污染, 生长状况

Abstract: 【Objective】 In order to explore the effects of Cd and Pb pollution on the growth of Chinese herbal medicine Hedyotis diffusa. 【Method】 Through artificial controlled hydroponic experiments, the growth trend of Hedyotis diffusa seedlings under single and combined stress of Cd and Pb was studied. 【Result】 The results showed that the stress effect of Cd-Pb compound treatment on the main root length, plant height and biomass was stronger than that of the same level single treatment. When Pb was treated alone, the main root length, biomass and chlorophyll of Hedyotis diffusa were promoted at low concentration and inhibited at high concentration;Cd alone significantly inhibited chlorophyll in seedlings. Under the condition of heavy metal stress, the growth index of Hedyotis diffusa was not lower than the maximum concentration of Pb under normal growth conditions in the range of 100-200 mg/L, and the maximum concentration of Cd was in the range of 10-20 mg/L. 【Conclusion】 When the Pb stress concentration was higher than 200 mg/L and the Cd stress concentration was higher than 20 mg/L, the main root length, plant height, biomass and chlorophyll content of Hedyotis diffusa seedlings were inhibited to different extents, and the inhibition of compound stress was stronger than single stress.

Key words: Hedyotis diffuse, nutrient solution culture, Cadmium stress, lead stress, growth status