农业环境科学学报Issue(10)：1853-1857,5.DOI:10.11654/jaes.2015.10.003
轮叶黑藻对无机砷的吸收和释放
Uptake and Release of Inorganic Arsenic by Hydrilla verticillata(L.f.)Royle.
摘要
Abstract
Hydrilla verticillata(L.f.)Royle is a widespread submerged macrophyte in aquatic environments and shows high arsenic(As)ac-mulation. Hence, comprehensive understanding of uptake and release as well as species transformation of As in H. verticillata is essential for the development of phytoremediation technologies. Simulation experiments were conducted to investigate the uptake and efflux of AsⅤand AsⅢby H. verticillata cultivated in solution. Results showed that:the highest influx rates(Vmax)of AsⅤand AsⅢwere 105 and 96.1 nmol· g-1 DW·min-1, respectively, with no significant difference in V max between AsⅤ and AsⅢ treatments(P﹥0.05). Regardless of As species supplied, AsⅢwas the predominant species in plant(﹥90%of total extractable As). AsⅤwas rapidly taken up by H. verticillata from the growth medium, and then reduced to AsⅢthat released to the external solution(The ratios of AsⅢefflux to AsⅤuptake was 53%). Phos-phorus addition significantly inhibited the uptake of AsⅤby H. verticillata, with plant AsⅢbeing 2/3 less than in-P treatment, but had lit-tle effects on AsⅢuptake, resulting in the predominance of AsⅤspecies in the external solution(over 90%of total As). BSO, a synthetic inhibitor of PCs, significantly reduced AsⅤand AsⅢaccumulation in H. verticillata(AsⅢ concentration in the plant shoots was only 8%and 10%of that in the control, respectively). However, there were no differences in As species in solution between with and without BSO treatments. In conclusion, H. verticillata shows high capacity for As accumulation, but the rapid reduction of AsⅤto AsⅢfollowed by leak-age of AsⅢmay limit the application of this plant in As phytoremediation.关键词
轮叶黑藻/砷/吸收/释放Key words
Hydrilla verticillata/arsenic/uptake/efflux分类
资源环境引用本文复制引用
薛培英,陈苗苗,耿丽平,赵全利,王亚琼..轮叶黑藻对无机砷的吸收和释放[J].农业环境科学学报,2015,(10):1853-1857,5.基金项目
国家自然科学基金资助项目（21407042）；河北省高等校院青年拔尖人才科学技术研究项目 （）
