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| Effects of lead stress on accumulation ability and antioxidant enzyme activities of Althaea rosea Cavan. |
| Received:March 10, 2017 |
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| KeyWord:lead stress;Althaea rosea Cavan.;antioxidant enzymes;accumulation characteristics;phytoremediation |
| Author Name | Affiliation | E-mail | | HUANG Ya-ping | College of Life Science, Nankai University, Tianjin 300071, China | | | ZU Li-hong | College of Life Science, Nankai University, Tianjin 300071, China | | | SHEN Guang-shuang | College of Life Science, Nankai University, Tianjin 300071, China | | | GAO Zhang-ying | College of Life Science, Nankai University, Tianjin 300071, China | | | ZHOU Mei-li | College of Life Science, Nankai University, Tianjin 300071, China | | | SHI Fu-chen | College of Life Science, Nankai University, Tianjin 300071, China | fcshi@nankai.edu.cn |
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| Abstract: |
| In the present study, Althaea rosea Cavan. was exposed to different concentrations of lead(Pb)(0, 50, 100, 200, and 500 mg·kg-1) for 70 d to evaluate its morphological, physiological, and biochemical responses. The results showed that Pb stress inhibited the growth of different parts of A. rosea, but lower concentrations stimulated an increase in biomass of the shoots. In addition, the accumulation of Pb was found to increase in a concentration-dependent manner, with a maximum of 13.44 μg·g-1 in the shoots and 17.72 μg·g-1 in the roots at 500 mg·kg-1. Leaf electrolyte leakage, hydrogen peroxide, superoxide anion, and malondialdehyde contents accumulated significantly as the concentration of Pb increased. In contrast, the content of chlorophyll decreased with increasing Pb concentration. In addition, the activities of antioxidant enzymes increased under lower Pb levels, but decreased at higher Pb levels. At the Pb concentration of 100 mg·kg-1, the activity of superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase increased by 5.6%, 29.36%, 22.48%, and 54.19%, respectively. This study signifies that A. rosea can adjust its own physiological and biochemical mechanisms to adapt to Pb stress, thus A. rosea can be used for soil remediation in contaminated areas. |
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