Pb、Cd单一及复合胁迫对桂花幼苗生理生化特性的影响  

Physiological and Biochemical Response of Osmanthus fragrans(Thunb.)Lourto Pb,Cd Stress

作　　者：王飞[1] 胥焘[1] 张晟[2] 郭强[1] 聂小倩[1] 黄应平[1] 

机构地区：[1]三峡库区生态环境教育部工程研究中心(三峡大学),湖北宜昌443002 [2]重庆市环境科学研究院,重庆401147

出　　处：《三峡环境与生态》2013年第1期3-7,共5页Environment and Ecology in the Three Gorges

基　　金：国家水污染控制与治理科技重大专项(2009ZX07104-003-03;2012ZX07104-002-04);湖北省高等学校优秀中青年科技创新团队(No:T200703)

摘　　要：采用土壤盆栽试验法,以桂花幼苗为对象,选择重金属Pb在质量比分别为0,50,100,500,1000和2000mg/kg条件下,Cd在质量比分别为0,1,10,50,100和200mg/kg条件下,研究了不同浓度Pb、Cd单一及复合胁迫对桂花幼苗生长的影响。结果表明,在试验条件下,随Pb和Cd处理浓度增加,桂花幼苗叶绿素含量呈下降趋势,POD活性先升后降,MDA含量呈上升趋势。Pb、Cd复合胁迫的毒性效应高于单一胁迫的毒性效应。Physiological and biochemical reactions of Osmanthus fragrans （Thunb.） Lour to Pb, Cd exposure, both separately and combined , were studied comprehensively in this paper. The results reveal that with exposure to the rising level of Pb,Cd, either separately or together, chlorophyll appeared to decline significantly , while peroxidase （POD） activities rose initially, then dropped later, malondialdehyde（MDA） exhibited increased level. The tests also show the combined Pb and Cd exposure exhibited severe toxicity than either Cd or Pb stress seperatelv.

关 键 词：PB CD 桂花 生理生化特性 

分 类 号：X173[环境科学与工程—环境科学]