Differences in Uptake and Tolerance to Cadm ium in Var ieties of Sa lix in tegra

YANG Wei-dong; CHEN Yi-tai

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.

1. Research Institute of Subtrop ical Forestry, CAF , Fuyang　311400, Zhejiang, China

Received Date: 2007-11-23

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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Reference (15)

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Differences in Uptake and Tolerance to Cadm ium in Var ieties of Sa lix in tegra

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