Abstract: In this study, a pot experiment was conducted to investigate the growth, antioxidant enzyme activities and lead (Pb) uptake, translocation and Pb subcellular distribution of Lantana comara L. under Pb treatment with different concentrations. The results showed that the dry weight of L. camara reached the maximum when the Pb concentration was at 100 mg·kg^-1, and significantly higher than the control, whereas the dry weight decreased significantly when soil Pb was higher than 600 mg·kg^-1, and the growth of L. camara was inhibited significantly. When the Pb concentration in soil was lower than 600 mg·kg^-1, the activity of antioxidant enzymes in L. camara was higher, which could alleviate the Pb induced oxidative stress. However, these activities displayed decreases when the soil Pb was higher than 600 mg·kg^-1, MDA contents and electrolyte leakage in L. camara were enhanced significantly, and induced membrane lipid peroxidation damage. With the increasing of Pb concentration in soil, the contents of Pb in different organs of L. camara increased gradually, and Pb content in root was higher than that in shoot when the Pb concentration in soil was lower than 1200 mg·kg^-1, and vise versa. It was suggested that L. camara root had a strong Pb retention capacity, which can reduce the toxicity of Pb to the organs of shoot. The proportion of Pb in soluble fraction in roots and leaves were highest, followed by cell wall. Therefore, L. camara is a Pbtolerant plant; its tolerance mechanism includes antioxidant system response, root retention, isolation in soluble fraction and cell wall immobilization.

Key words: pelagic shark, stable isotope, Central Eastern Pacific., niche