To study the tolerance and adsorption capacity of Salix matsudana Koidz cv.zhuliu against Pb2+ contamination,cuttings of S.matsudana were cultured in water with four different Pb2+ concentrations (0,100,200 and 400 mg · L-1).The growing indexes, photosynthetic parameters and the contents of mineral elements in various organs were measured and analyzed.The results showed that, 100 mg · L-1 Pb2+ stress promoted the growth,while 200 mg · L-1 and 400 mg · L-1 Pb2+ stress suppressed the plant height,leaf number,the length of root and the biomass.With the increase of Pb2+ concentration,the photosynthetic rate, transpiration rate and stomatal conductance firstly increased and then decreased, however the intercellular CO2 concentration increased continuously.The distribution of Pb2+ in various organs was in the order of root ＞ leaf ＞ stem.Pb2+ accumulated gradually in various organs with the increase of Pb2+ concentration,but both the corresponding transport coefficients and the enrichment factors decreased.Pb2+ stress facilitated the absorption of Ca2+ in different organs significantly (p＜0.05),but inhibited the absorption of K+ and Mg2+.The study indicated that S.matsudana Koidz cv.zhuliu could adapt and resist Pb2+ stress in a certain extent.
Salix matsudana Koidz cv.zhuliuheavy metalPb2+ stressphotosynthetic parametermineral element
国家科技期刊平台
NSTL
万方数据
维普
