铀胁迫对空心菜与木耳菜的生理生态响应  

Physio-Ecological Response of Water Spinach (Ipomoea aquatica Forsk) and Gymura cusimbua to Uranium Stress

作　　者：龙俊 黄文暖 陈迪云 文旺凤 宋刚 

机构地区：[1]广州大学环境科学与工程学院,广东省放射性核素污染控制与资源化重点实验室,广东广州

出　　处：《世界生态学》2017年第2期61-68,共8页International Journal of Ecology

基　　金：国家自然科学基金(41373117,U1501231,40930743)项目资助。

摘　　要：通过盆栽实验,研究空心菜和木耳菜在铀胁迫下,植物体内的丙二醛(MDA)含量、叶绿素含量、可溶性蛋白质含量、过氧化氢酶(CAT)和过氧化物酶(POD)活性的变化。结果表明:空心菜的MDA含量随土壤铀含量的增加逐渐上升,木耳菜MDA含量则先下降后上升;植物叶绿素含量受到低浓度铀的刺激,均呈现不同程度的增加,表明光合作用加强;两种植物的CAT和POD活性都呈先下降后上升的趋势,且波动幅度较大,说明植物产生膜脂过氧化,启动了过氧化酶系统;植物体内可溶性蛋白质合成受到抑制,试验结果呈明显的下降趋势:木耳菜下降33.24%,空心菜降幅达44.16%。Based on a pot experiment, the variation of malondialdehyde (MDA) concentration, chlorophyll, soluble protein and the activities of catalase (CAT) and peroxidase (POD) of water spinach (Ipo-moea aquatica Forsk) and Gymura cusimbua were investigated in response to uranium stress. Results indicated that, with the concentration of uranium increased, the content of MDA increased gradually in water spinach (Ipomoea aquatica Forsk), whereas decreased firstly, and then increased in Gymura cusimbua. Chlorophyll content in plants increased in different degrees, as stimulated by lower concentration of uranium, which indicated the strengthening photosynthesis. The activities of CAT and POD in two kinds of plants were decreased firstly and then increased, which demonstrated that membrane lipid peroxidation of the plant has been produced and activated the peroxidase system. The synthesis of soluble protein in plants was inhibited, showing a significant downward trend;Gymura cusimbua and water spinach (Ipomoea aquatica Forsk) fell by 33.24% and 33.24% respectively.

关 键 词：铀胁迫 空心菜 木耳菜 生理生态响应 

分 类 号：S5[农业科学—作物学]