干旱和铅胁迫对刺槐和紫穗槐抗氧化酶活性的影响

Effects of Drought and Lead Stresses on Antioxidant Enzyme Activities of Robinia pseudoacacia and Amorpha fruticosa

通过盆栽实验,研究了铅胁迫和干旱胁迫对1a生刺槐、紫穗槐及其紫穗槐平茬后萌条叶片抗氧化酶活性和丙二醛含量的影响。结果表明:高浓度(1 000～3 000mg.kg-1)的铅处理能提高SOD活性,低浓度(300～500mg.kg-1)的铅处理提高了POD活性;水分和铅胁迫共同作用,刺激了各树种叶片的酶活性。综合分析,紫穗槐的抗性优于刺槐,抗铅胁迫能力紫穗槐苗木>紫穗槐萌条>刺槐苗木。

The effects of heavy metal Pb and drought stresses on the antioxidant enzyme activities and malondialdehyde concentration of Robinia pseudoacacia and Amorpha fruticosa in one-year old seedlings were studied with pot experiments for the selection of tree species with strong resistance. The results showed that lead stress at higher concentration （1 000-3 000mg·kg-1） and at lower （300-500 mg·kg-1） could improve activity, could improve SOD and POD activities, respectively. Both water and lead stresses could improve antioxidant enzyme activities of the leaves. Based on a comprehensive analysis, the resistance of A. fruticosa was better than R. l）seudoacacia. Antistress abilities to Pb were in the order of A. fruticosa seedling〉A, fruticosa cutting〉R, pseudoacacia seedling.