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TECHNICAL REPORTS

Plant and Environment Interactions

Clonal Differences in Mercury Tolerance, Accumulation, and Distribution in Willow

Department of Botany, Stockholm University, SE-106 91 Stockholm, Sweden

^* Corresponding author (yaodong.wang{at}botan.su.se).

Received for publication November 19, 2003. This study was performed to investigate mercury (Hg) tolerance, accumulation, and translocation within the genus Salix for the potential use of this plant to remediate Hg-contaminated sites. Six clones of willow (Salix spp.) were tested on tolerance to Hg by treating plants grown in solution culture with 0 to 15 µM HgCl₂. Results showed that willow had a large variation in its sensitivity to Hg. However, the accumulation and translocation of Hg to shoots was similar in the eight tested willow clones as shown by cold vapor atomic absorption spectrometry analysis when plants were treated with 0.5 µM HgCl₂ in a nutrient solution. The majority of total Hg accumulated was localized to the roots, whereas only 0.45 to 0.62% of the total Hg accumulated via roots was translocated to the shoots. Thus, the root system is the main tissue of willow that accumulates Hg and the majority of the Hg in the root system (80%) was bound in the cell wall.

Abbreviations: EC₅₀, the HgCl₂ concentration where growth was reduced by 50% • TT_95b, toxicity threshold indicating the HgCl₂ concentration where growth was reduced by 5% • UT_max, maximum unit toxicity

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This Issue in Journal of Environmental Quality

JEQ 2004 33: 1589-1599. [Full Text]