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| Comparison of cadmium accumulation and physiological responses among Solanum nigrum L. and three alien invasive plants |
| Received:November 16, 2023 |
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| KeyWord:alien invasive plant;cadmium（Cd）;extraction efficiency;physiological and biochemical property;remediation effectiveness |
| Author Name | Affiliation | E-mail | | CHEN Yu | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology/Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | WANG Haijuan | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology/Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | WANG Hongbin | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology/Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | whb1974@126.com |
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| Abstract: |
| The objective of this work was to study the differences in remediation effectiveness and physiological response to cadmium（Cd）- contaminated soil among a native Cd hyperaccumulator（Solanum nigrum L.）and three alien invasive plants（Bidens pilosa L., Ageratina adenophora Spreng and Mirabilis jalapa L.）. A pot experiment was conducted to compare Cd accumulation, Cd extraction efficiency, photosynthetic pigment contents, antioxidant enzyme activities, contents of malondialdehyde and soluble sugar in leaves of S. nigrum and three alien invasive species exposed to different contents of Cd（0, 2, 10 mg · kg-1, and 30 mg · kg-1）. The results showed that the aboveground biomass of B. pilosa was significantly higher than that of S. nigrum and the other two alien invasive plants when treated with Cd. Regardless of Cd contents, the highest Cd extraction efficiency was observed in B. pilosa（0.61%-1.87%）and the lowest was in M. jalapa（0.02%-0.03%）. The Cd extraction efficiency of S. nigrum（0.30%-0.79%）and A. adenophora（0.24%-1.06%）was at a moderate level. The highest contents of chlorophyll a, chlorophyll b, and carotenoid were observed in B. pilosa when treated with Cd. The antioxidant enzyme activities of B. pilosa were significantly higher than those of S. nigrum, and the contents of malondialdehyde in leaves of S. nigrum was significantly higher than that in invasive plants. Stepwise regression analysis showed that the Cd extraction efficiency of S. nigrum was significantly negatively correlated with the contents of malondialdehyde in its leaves, and significantly positively correlated with the CAT activity. The Cd extraction efficiency of B. pilosa and A. adenophora was significantly negatively correlated with the content of malondialdehyde in their leaves. In conclusion, compared with the native species, the invasive plant B. pilosa is more suitable for the remediation of Cd-contaminated soil at 2-30 mg·kg-1 Cd treatments in soil. |
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