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Effects of Pb treatment on proline (a), soluble sugar (b) and membrane stability index (c) in leaves of Hemerocallis fulva, Iris germanica L., Canna generalis, Pennisetum clandestinum, and Miscanthus sinensis. Vertical bars represent ± SD of the mean (n = 3); different letters on the SD bars indicate significant differences among the Pd treatments (p < .05). Pb, Pb treatment; PS, plant species. **Significant differences at p < .01
