Pb Accumulation and Tolerance of Ten Cultivars of Cruciferae

Pb uptake, accumulation and tolerance of ten cultivars (S₁, S₂, S₃, S₄, S₅, S₆, S₇, S₈, S₉ and S₁₀) of Cruciferae were investigated with water culture. Three strategies of Pb uptake and accumulation were found in the ten cultivars: root exclusion strategy, accumulating less Pb in both root and shoot (<500 mug/g DW) (S₄); shoot exclusion strategy, accumulating large amounts of Pb in root (>1 000 mug/g DW) and less in shoot (<1 000 mug/g DW) (S₁, S₂, S₇ and S₈); hyperaccumulating strategy, accumulating large amounts of Pb in both root and shoot (>1000 mug/g DW) (S₃, S₅, S₆ , S₉ and S₁₀). S₃, S₄, S₄, S₈ and S₉ have high Pb tolerance and S₁, S₂, S₅ and S₇ have low Pb tolerance.