匍茎翦股颖对Cu^(2+)、Zn^(2+)、Cd^(2+)与Pb^(2+)胁迫的生长响应与阈限浓度(英文)  

Growth response and threshold concentration of Agrostis stolonifera to Cu^(2+),Zn^(2+),Cd^(2+) or Pb^(2+) stress

作　　者：赵树兰[1] 多立安[1] 

机构地区：[1]天津师范大学化学与生命科学学院,天津300387

出　　处：《广西植物》2008年第1期100-106,共7页Guihaia

基　　金：天津市高等学校科技发展基金(20040716);天津市科技发展计划项目(043100611);国家自然科学基金(59878033)~~

摘　　要：采用砂培法,研究了匍茎翦股颖对Cu2+、Zn2+、Cd2+与Pb2+胁迫的生长响应及阈限浓度,结果表明:种子萌发率随着4种重金属浓度的增加而下降。对株高的影响是当重金属浓度小于100mg/L时会促进株高生长,高于100mg/L则产生抑制作用。Cu2+显著抑制根系生长,并随浓度的增加抑制效应愈加显著;在Cu2+浓度为600mg/L时匍茎翦股颖的根长比对照下降了93.75%。Cu2+、Zn2+、Pb2+浓度小于200mg/L时会促进地上生物量的增加,但高于200mg/L时,地上生物量会随着3种重金属的增加而减少。Cu2+、Zn2+浓度小于100mg/L或Cd2+、Pb2+浓度小于200mg/L会增加叶绿素的含量,高浓度会降低叶绿素的含量;Cd2+在浓度为600mg/L时显著降低叶绿素含量,与对照相比,下降了43.55%。匍茎翦股颖生长的综合效应分析表明,匍茎翦股颖对Cu2+胁迫最敏感,具有较低的阈限浓度,而Zn2+胁迫对匍茎翦股颖的生长影响最小,阈限浓度相对较高。By sand cultural method, the experiment was conducted to investigate growth response and threshold concentration of Agrostis stolonifera to Cu^2＋ ,Zn^2＋ ,Cd^2＋ or Pba＋ stress. It was found that rate of seed germination decreased with increasing supply of Cu^2＋ ,Zn^2＋ ,Cd^2＋ or Pb^2＋. Heavy metal supply at concentration ≤100 mg/L increased plant height of A. stolonifera, whereas Cu^2＋ ,Zn^2＋ ,Cd^2＋ or Pb^2＋ supply higher than 100 mg/L decreased plant height. Cu^2＋ inhibited root growth significantly,and root length decreased with increasing Cu^2＋ supply. Compared with the control, root length of A. stolonifera was lowered hy 93.75% at Cu^2＋ concentration of 600 mg/L. Ahoveground hiomass increased at Cu^2＋ , Zn^2＋ or Pb^2＋ concentration ≤200 mg/L, but decreased with increasing concentrations when their concentrations were higher than 200 mg/L. Chlorophyll content increased at Cu^2＋ ,Zn^2＋ concentration ≤100 mg/L or Cd^2＋ ,Pb^2＋ concentration ≤200 mg/L,but tended to decrease at Cu^2＋ , Zn^2＋ concentration ≥100 mg/L or Cd^2＋ ,Pb^2＋ concentration ≥200 mg/L. Only Cde＋ significantly lowered chlorophyll content of A. stolonifera by 43. 55% at concentration of 600 mg/L. Synthetical effect of heavy metal on A. stolonifera growth indicated that A. stolonifera was most sensitive to Cu^2＋ stress with low threshold, but the effect of Zn^2＋ stress on A. stolonifera growth was the least.

关 键 词：重金属胁迫 匍茎翦股颖 生长响应 阈限浓度 

分 类 号：Q948.116[生物学—植物学]