中文摘要：

利用常规、含Cd^2＋和含Pb^2＋的3种细菌培养基，分离云南省会泽县铅锌矿区圆叶无心菜的根际细菌，采用含Cd^2＋或Pb^2＋的培养液培养分离物，研究和比较这3种培养基分离的细菌对Cd^2＋和Pb^2＋的耐性，结果表明，Cd^2＋和Pb^2＋抑制3种细菌培养基分离的铅锌矿区圆叶无心菜根际细菌的生长。Cd^2＋对常规、含Cd^2＋和含Pb^2＋细菌培养基分离的圆叶无心菜根际细菌生长半数抑制浓度（EC50）平均值分别为0．20、0．41和0．24mmol·L^-1，EC50最大值分别为0．70、0．79和0．48mmol·L^-1；Pb^2＋的EC50平均值分别为0．40、0．53和0．52mmol·L^-1，EC50最大值分别为0．77、0．87和0．82mmol·L^-1。含Cd^2＋的培养基分离的圆叶无心菜根际细菌对Cd和Ph的耐性较强。

英文摘要：

Cuhurable rhizosphere bacteria of Arenaria orbiculata in abandoned lead - zinc mine area in Huize, Yunnan, China were isolated by common, Cd^2＋ or Pb^2＋ containing media. Cd and Pb tolerance of bacteria isolated by 3 media was studied by culturing the bacteria in fluid media containing Cd^2＋ or Pb^2＋ , the results showed that： the growth of rhizosphere bacteria of Arenaria orbiculata in abandoned lead - zinc mine area was suppressed by Cd^2＋ or Pb^2＋. The average EC50 of Cd^2＋ on inhibition of the growth of rhizosphere bacteria isolated by common, Cd^2＋ or Pb^2＋ containing media was 0.20, 0.41 and 0.24 mmol ·L^-1, the maximum ECho of Cd^2＋ was 0.70, 0.79 and 0.48 mmol·L^-1 respectively. The average EC50 of Pb^2＋ on inhibition of the growth of rhizosphere bacteria isolated by common, Cd^2＋ or Pb^2＋ containing media was 0.40, 0.53 and 0.52 mmol·L^-1, the maximum EC50 of Pb^2＋ was 0.77, 0.87 and 0.82 mmol·L^-1 respectively. Cd and Pb tolerance of Arenaria orbiculata rhizosphere bacteria isolated by Cd^2＋ containing media was stronger.