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Growth status and dry biomass (g pot−1) of hyperaccumulator ecotype (HE) and nonhyperaccumulator ecotype (NHE) S. alfredii planted in different Cd-contaminated soils. Cd 0 denotes the control treatment; Cd 5 and Cd 20 denote 5-mg kg−1 and 20-mg kg−1 Cd-spiked treatments.
