白菜对铈、铅胁迫响应的比较研究  

COMPARISON OF THE PHYSIOLOGICAL RESPONSE OF CHINESE CABBAGE BETWEEN CERIUM AND LEAD STRESS

作　　者：王学[1] 徐恒戬[1] 刘涛[1] 

机构地区：[1]山东理工大学生命科学学院,山东淄博255049

出　　处：《核农学报》2010年第3期634-638,共5页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金项目(No:30900071);山东理工大学博士科研启动经费(4041-406027)

摘　　要：比较研究了稀土元素—铈(Ce3+)和重金属元素—铅(Pb2+)对白菜种子萌发和幼苗生长发育的影响。结果表明:Ce3+和Pb2+在低浓度范围内均能促进白菜植株的生长,刺激叶绿素、可溶性蛋白质的合成,提高过氧化物酶(POD)、过氧化氢酶(CAT)活性;在浓度高于20mg/L时,2种元素对白菜幼苗的生长发育都有较强的毒害作用,均能破坏保护酶防御系统的平衡,造成叶绿素和可溶性蛋白含量下降,引起有害物质丙二醛(MDA)的积累。在较高浓度(20～100mg/L)范围内,Ce3+表现出比Pb2+更强的毒性。由此可见,稀土元素Ce3+与重金属元素Pb2+毒害机制相似。这提示应该严格控制稀土元素的使用和排放,尽量避免其带来与重金属相似的灾害。In the present study,we compared the effects of rare earth element cerium （Ce3 ＋ ） and heavy metal element lead （ Pb2 ＋ ） on seed germination and seedling growth of Chinese cabbage. Results showed that low concentration treatment of Ce3 ＋ and Pb2 ＋ accelerated the seedling growth,stimulated the synthesis of chlorophyll and soluble protein, and elevated activities of POD and CAT. Higher concentration （ 20mg /L） treatment brought harm effect to Chinese cabbage by breaking the balance of protective enzyme system,decreasing the contents of chlorophyll and soluble protein, and stimulating the accumulation of MDA. The toxicity of Ce3 ＋ was higher than Pb2 ＋ in the range of concentration （20 ～ 100mg /L）. It is concluded that the toxic mechanism of Ce3 ＋ was similar to that of Pb2 ＋ . The study would be helpful to offer theoretical reference for biological monitoring of REEs and setting environmental standard and effluent standards of REEs in order to avoid the similar pollotion of heavy metals.

关 键 词：白菜 铈 铅 胁迫 

分 类 号：S634.1[农业科学—蔬菜学]