不同杞柳品种对镉(Cd)吸收与忍耐的差异  

Differences in Uptake and Tolerance to Cadmium in Varieties of Salix integra

作　　者：杨卫东[1] 陈益泰[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《林业科学研究》2008年第6期857-861,共5页Forest Research

基　　金：浙江省科技厅重大项目(2006C12065)资助

摘　　要：柳树是适宜植物修复的木本植物。通过水培筛选方法，比较3种杞柳品种对镉（Cd）的积累与忍耐差异。cd处理浓度为0、10、50μmol·L^-1CdCl2，处理6周。结果显示：3个品种的枝、根生物量以及对Cd忍耐和积累水平存在差异。Cd不同程度降低了3种杞柳茎高，减少侧根数以及枝、根生物量；介质中Cd剂量的提高降低了杞柳从根到茎运输Cd的能力，Cd在根中积累显著高于枝部，枝根Cd浓度比值低于1，并且随介质中cd剂量的提高，其比值降低，但枝根Cd总量比值高于1，并随介质浓度升高而降低；微山湖品种的忍耐系数TI根为0．61～0．82；大红头品种的TI根为0．88，一枝笔品种的TI根为0．92～0．93。3种杞柳品种对Cd有一定的吸收和忍耐能力，初步说明3种杞柳品种能够修复低中等污染的土壤。Willows （ Salix spp. ） have been proposed for use in phytoremediation technology. Three varieties of Salix integra in hydroponic experiments for their metal resistance and accumulation were investigated. Plants were exposed for 6 weeks with 0 μmol · L^-1 , 10 μmol · L^-1 , 50 μmol · L^-1 CdCl2, measurements of growth parameters have been combined with Cd concentration in shoots and roots. Plant biomass, metal tolerance and Cd accumulation pattern in shoots and roots varied among varieties. Shoot growth and number of lateral roots were significantly reduced under cadmium treatment, 10 μmol · L^-1 and 50 μmol · L^-1 CdCl2 treatments reduced the dry biomass of shoots and roots, Elevated Cd concentration in medium decreased Cd transport from roots to shoots in all varieties. The leaf： root ratios for Cd in all varieties were 〈 1, but the total amount of Cd in shoot： root were highly significantly 〉 1, the ratios of total amount of Cd decreased with Cd level in the medium. Tolerance Index （TIroot） of S. integra ‘Weishanhu＇ variety was 0.61---0.82, S. integra ‘Dahongtou＇ variety had a TIroot of 0.88, TIroot of S. integra ‘Yizhibi＇ was about 0. 92--0. 93. These results showed that Salix integra has the potential to be used for phytoextration of Cd in moderately contaminated soil.

关 键 词：杞柳 品种 镉 积累 忍耐 

分 类 号：S792.12[农业科学—林木遗传育种]