Abstract:A pot experiment was conducted to study effects of different Cd concentrations on growth of soybean plants, (Glycine max), and changes of chlorophyll contents, SOD (superoxide dismutase) activities, POD (peroxidase) activities and MDA (malondialdehyde) contents in the leaves of this plant at seedling stage, flowering-poding stage, and mature stage. Growth of soybean plants at three growth stages showed that the stimulating effects at low Cd concentrations (£0.50mg/kg) and the inhibitory effects at high Cd concentrations(31.00mg/kg) under Cd stress; however, growth of plants was inhibited with increase in Cd concentrations. At the seedling stage, chlorophyll contents and SOD activities decreased obviously, POD activities increased rapidly, and these processes relieved Cd phyto-toxicity. At the flowering-poding stage, the antioxidant defense systems inside soybean plants were excited effectively by Cd stress; resulting in increases of POD and SOD activities rapidly with chlorophyll contents increasing. At the mature stage, SOD and POD activities and chlorophyll contents of soybean plants decreased sharply due to a long-term toxicity of Cd, especially under Cd stress with high concentrations. Changes in physiological indicators of soybean plants at seedling stage, flowering-poding stage, and mature stage indicated complete different modes with increase in Cd concentrations at three stages. Growth indicators (biomass and height of plants) of the plants were remarkably correlated to SOD activities in the whole growth period.
廖柏寒, 刘俊, 周航, 曾敏, 黄运湘, 周细红, 曾清如. Cd胁迫对大豆各发育阶段生长及生理指标的影响[J]. 中国环境科学, 2010, 30(11): 1516-1521.
LIAO Bai-Han, LIU Jun, ZHOU Hang, ZENG Min, HUANG Yun-Xiang, ZHOU Xi-Hong, ZENG Qing-Ru. Effects of Cd stress on physiological and ecological indicators and their differences of soybean plants at different growth stages. . CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(11): 1516-1521.