不同杞柳品种对镉( Cd)吸收与忍耐的差异
Differences in Uptake and Tolerance to Cadm ium in Var ieties of Sa lix in tegra
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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-1 CdCl2 ,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。Abstract: W illows (Salix spp. ) have been p roposed for use in phytoremediation technology. Three varieties of Salixin tegra in hydroponic experiments for theirmetal resistance and accumulation were investigated. Plantswere exposedfor 6 weekswith 0μmol·L-1 , 10μmol·L-1 , 50μmol·L-1 CdCl2 , measurements of growth parameters havebeen combined with Cd concentration in shoots and roots. Plant biomass, metal tolerance and Cd accumulationpattern in shoots and roots varied among varieties. Shoot growth and number of lateral roots were significantlyreduced under cadmium treatment, 10μmol·L-1 and 50μmol·L-1 CdCl2 treatments reduced the dry biomass ofshoots 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 varietieswere 1, the ratios of total amount of Cd decreased with Cd level in the medium. Tolerance Index ( TIroot ) of S. integ ra‘Weishanhu’variety was 0. 61—0. 82, S. integ ra‘Dahongtou’variety had a TIroot of 0. 88, TIroot of S. integ ra‘Yizhibi’was about 0. 92—0. 93. These results showed that S alix in tegra has the potential to be used forphytoextration of Cd in moderately contaminated soil.
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Key words:
- Salix integra
- / variety
- / cadmium
- / accumulation
- / tolerance
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