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香根草对重金属铅离子的胁迫反应研究
引用本文:韩露,张小平,刘必融.香根草对重金属铅离子的胁迫反应研究[J].应用生态学报,2005,16(11):2178-2181.
作者姓名:韩露  张小平  刘必融
作者单位:安徽师范大学生命科学学院,安徽省重要生物资源保护与利用研究重点实验室,芜湖,241000
基金项目:国家自然科学基金项目(49871078),安徽省教育厅自然科学基金项目(2003kj149),安徽省重要生物资源保护与利用研究重点实验室基金资助项目.
摘    要:研究了Pb2+对香根草生理生态指标的影响.结果表明, 随水培液中Pb2+浓度的增加(0~8 mmol·L-1),香根草苗的生长受到严重影响;叶片电导率增大;SOD活性先上升后下降,但均高于对照,其活性与Pb 2+浓度呈正相关;POD和CAT活性虽也是先上升后下降,但在高浓度(>4 mmol·L-1)的Pb2+处理下,酶活性均低于对照,其酶活性与Pb2+浓度呈显著负相关.可以认为,酶活性升高是由于香根草苗对Pb2+胁迫做出的应激反应,而高浓度Pb2+却对香根草苗的保护酶活性有抑制作用.

关 键 词:香根草  无菌苗  Pb2    胁迫
文章编号:1001-9332(2005)11-2178-04
收稿时间:2005-03-07
修稿时间:2005-06-20

Response of Vetiveria zizanioides to Pb 2+ stress
HAN Lu,ZHANG Xiaoping,LIU Birong.Response of Vetiveria zizanioides to Pb 2+ stress[J].Chinese Journal of Applied Ecology,2005,16(11):2178-2181.
Authors:HAN Lu  ZHANG Xiaoping  LIU Birong
Institution:Province Key Laboratory of Biological Resources Conservation and Utilization, College of Life Science,Anhui Normal University,Wuhu 241000,China
Abstract:The study on the eco-physiological indices of V.zizanioides under Pb 2+ stress showed that with the increase of Pb2+ concentration (0~8 mmol· L-1 in water culture,the growth of V.zizanioides seedlings was badly influenced. Their leaves'conductivity increased,while SOD activity increased first and decreased then,but still higher than control.There was a positive correlation between SOD activity and Pb2+ concentration.POD and CAT activities were also increased first and decreased then,but when the Pb2+ concentration was>4 mmol·L-1,these enzyme activities were lower than the control,and had a significantly negative correlation with Pb2+ concentration.It was considered that the increase of enzyme activities was resulted from the adaptability of V.zizanioides stressed by Pb2+,while high concentration Pb2+ had an inhibitory effect on enzyme activities.
Keywords:Vetiveria zizanioides  Aseptic seedlings  Pb~(2 ) stress  
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