文献类型：期刊文献

英文题名：Uptake of cadmium from hydroponic solutions by willows (Salix spp.) seedlings

作者：Liu, Yongqing[1,2] Chen, Guang-Cai[1] Zhang, Jianfeng[1] Shi, Xiang[1] Wang, Renmin[2]

第一作者：Liu, Yongqing

通信作者：Chen, GC[1]|[a000551c9abd7c3960d59]陈光才;

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Zhejiang, Peoples R China;[2]Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310029, Zhejiang, Peoples R China

年份：2011

卷号：10

期号：72

起止页码：16209-16218

外文期刊名：AFRICAN JOURNAL OF BIOTECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000298557500014)】；

基金：This work was supported by the Research Institute of Subtropical Forestry, Chinese Academy of Forestry (RISF 6803) and Jiangsu Provincial Key Scientific and Technological Project (BE2009603 and BE2008636). We sincerely thank Professor Xiao-Quan SHAN, State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, for his comments on this paper.

语种：英文

外文关键词：Cadmium; willow; uptake kinetics

摘要：Willow (Salix sp.) has large biomass production and high resistance to environmental stress. As an important multipurpose tree species in afforestation, it has been proved to be effective in the uptake and accumulation of metals from contaminated waters and soils. Suliu172 (Salix x jiangsuensis 'J172'), Hanliu (Salix matsudana), Weishanhu (Salix integra 'Weishanhu') and Yizhibi (S. integra 'Yizhibi') were chosen as model plants to evaluate their potential for uptake of cadmium from hydroponic culture and relative uptake mechanism. Cadmium uptake showed a linear increase in the short time course, and a nonlinear and slow increase in the long time course. After one week cultivation, cadmium accumulation in different parts of willows generally followed the order of root > stem > leaf. Cadmium influx in willow roots increased with the increase of cadmium concentration in hydroponic solutions. A modified Michaelis-Menten equation was employed to describe the concentration-dependent kinetics of cadmium uptake through the roots. Cadmium influx could be resolved into linear and saturable components under concentration-dependent kinetics. The saturable component followed Michaelis-Menten kinetics, which indicated that cadmium uptake across the plasma membrane was transporter-mediated. The uptake capacity (V-max/K-m) jointly decided by the V-max and K-m followed descending order of Hanliu > Weishanhu approximate to Yizhibi > Suliu172, indicating that their inherent potential of cadmium uptake reduced in turn. Low temperature and metabolic inhibitor inhibited the apparent uptake of cadmium in willow. Both active absorption and passive absorption occurred in the cadmium uptake by willow roots.