香根草对重金属铅离子的胁迫反应研究  

Response of Vetiveria zizanioides to Pb^(2+) stress

作　　者：韩露[1] 张小平[1] 刘必融[1] 

机构地区：[1]安徽师范大学生命科学学院

出　　处：《应用生态学报》2005年第11期2178-2181,共4页Chinese Journal of Applied Ecology

基　　金：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Pb2+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.The study on the eco-physiological indices of V. zizanioides under Pb^2＋ stress showed that with the increase of Pb^2＋ concentration （0～8 retool·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 Pb^2＋ concentration. POD and CAT activities were also increased first and decreased then, but when the Pb^2＋ concentration was 〉 4 mmol·L^-1, these enzyme activities were lower than the control, and had a significantly negative correlation with Pb^2＋ concentration. It was considered that the increase of enzyme activities was resulted from the adaptability of V. zizanioides stressed by Pb^2＋, while high concentration Pb^2＋ had an inhibitory effect on enzyme activities.

关 键 词：香根草 无菌苗 PB^2+ 胁迫 

分 类 号：Q945.78[生物学—植物学]