Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia
The indigenous species Artemisia lavandulaefolia, widespread in areas co-contaminated with Cd and Hg, has the potential for phytoremediation. However, the mechanisms that underlie these plants' resistance to combined Hg and Cd stress are unelucidated. The influence of the dosage of one metal on...
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Elsevier
2025-02-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651325001393 |
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| author | Gangyang Zhang Guo Chen Rui Yang Chunlian Bai Weiyuhao Yang Juan Zhang Xuyang Yin Fang Yang Chandra Shekhar Seth Haitao Liu |
| author_facet | Gangyang Zhang Guo Chen Rui Yang Chunlian Bai Weiyuhao Yang Juan Zhang Xuyang Yin Fang Yang Chandra Shekhar Seth Haitao Liu |
| author_sort | Gangyang Zhang |
| collection | DOAJ |
| description | The indigenous species Artemisia lavandulaefolia, widespread in areas co-contaminated with Cd and Hg, has the potential for phytoremediation. However, the mechanisms that underlie these plants' resistance to combined Hg and Cd stress are unelucidated. The influence of the dosage of one metal on another has also not been adequately quantified. We investigated the combined and interactive effects of varying doses of Cd and Hg on this species' growth, heavy metal accumulation, and physiological responses. We found that increased Hg and Cd in the co-contaminants inhibited biomass by 16–59 %. The interaction between these heavy metals on growth was concentration-dependent, with an antagonistic effect (concentration addition index (CAI) and effect addition index (EAI) < 0) at low concentrations and an additive effect at high concentrations. An increase in one metal had a beneficial effect on the aboveground accumulation of the other metal, reaching bioconcentrations of 20.16 and 2.25 for Cd and Hg, respectively. Furthermore, the elevation of Cd in the solution increased the proportion of Hg in the cell walls to 31.5 %; however, increasing the Hg dose did not change the Cd concentration in this substructure. Our results also demonstrate that different physiological responses occurred with increased Hg and Cd in the co-contaminants. The elevation of Hg in the mixture had a greater effect on photosynthetic systems than the increased Cd levels. The antioxidant systems of roots and leaves play important roles in attenuating Hg and Cd stress, respectively. Principal component analysis (PCA) revealed concentration-dependent trade-offs between heavy metal accumulation and plant growth and between the above- and belowground antioxidant activities of Artemisia lavandulaefolia for the first time. With increasing Hg, plants preferred to stimulate belowground antioxidant activity, whereas high concentrations of Cd followed the opposite trend. This study provides a theoretical basis for the phytoremediation of this species under combined heavy metal pollution. It highlights that the concentration-dependent interaction between Hg and Cd on plant toxicity should not be ignored during phytoextraction in co-contaminated environments. |
| format | Article |
| id | doaj-art-e9b0805daf5546fba6d52c38a1fdcde8 |
| institution | Kabale University |
| issn | 0147-6513 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj-art-e9b0805daf5546fba6d52c38a1fdcde82025-01-31T05:10:00ZengElsevierEcotoxicology and Environmental Safety0147-65132025-02-01291117803Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefoliaGangyang Zhang0Guo Chen1Rui Yang2Chunlian Bai3Weiyuhao Yang4Juan Zhang5Xuyang Yin6Fang Yang7Chandra Shekhar Seth8Haitao Liu9College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, PR ChinaCollege of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, PR China; College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, PR China; Tianfu Yongxing Laboratory, #619 Jicuijie, Tianfuxinqu, Chengdu 610213, Sichuan Province, PR China; Corresponding author at: College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, PR China.College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, PR ChinaCollege of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, PR ChinaCollege of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, PR ChinaCollege of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, PR ChinaCollege of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, PR ChinaCollege of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, PR ChinaDepartment of Botany, University of Delhi, New Delhi 110007, Delhi, IndiaCollege of Resources and Environment, Henan Agricultural University, Zhengzhou 450046, PR ChinaThe indigenous species Artemisia lavandulaefolia, widespread in areas co-contaminated with Cd and Hg, has the potential for phytoremediation. However, the mechanisms that underlie these plants' resistance to combined Hg and Cd stress are unelucidated. The influence of the dosage of one metal on another has also not been adequately quantified. We investigated the combined and interactive effects of varying doses of Cd and Hg on this species' growth, heavy metal accumulation, and physiological responses. We found that increased Hg and Cd in the co-contaminants inhibited biomass by 16–59 %. The interaction between these heavy metals on growth was concentration-dependent, with an antagonistic effect (concentration addition index (CAI) and effect addition index (EAI) < 0) at low concentrations and an additive effect at high concentrations. An increase in one metal had a beneficial effect on the aboveground accumulation of the other metal, reaching bioconcentrations of 20.16 and 2.25 for Cd and Hg, respectively. Furthermore, the elevation of Cd in the solution increased the proportion of Hg in the cell walls to 31.5 %; however, increasing the Hg dose did not change the Cd concentration in this substructure. Our results also demonstrate that different physiological responses occurred with increased Hg and Cd in the co-contaminants. The elevation of Hg in the mixture had a greater effect on photosynthetic systems than the increased Cd levels. The antioxidant systems of roots and leaves play important roles in attenuating Hg and Cd stress, respectively. Principal component analysis (PCA) revealed concentration-dependent trade-offs between heavy metal accumulation and plant growth and between the above- and belowground antioxidant activities of Artemisia lavandulaefolia for the first time. With increasing Hg, plants preferred to stimulate belowground antioxidant activity, whereas high concentrations of Cd followed the opposite trend. This study provides a theoretical basis for the phytoremediation of this species under combined heavy metal pollution. It highlights that the concentration-dependent interaction between Hg and Cd on plant toxicity should not be ignored during phytoextraction in co-contaminated environments.http://www.sciencedirect.com/science/article/pii/S0147651325001393CadmiumMercuryCombined InteractionAntioxidantsTrade-offArtemisia lavandulaefolia |
| spellingShingle | Gangyang Zhang Guo Chen Rui Yang Chunlian Bai Weiyuhao Yang Juan Zhang Xuyang Yin Fang Yang Chandra Shekhar Seth Haitao Liu Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia Ecotoxicology and Environmental Safety Cadmium Mercury Combined Interaction Antioxidants Trade-off Artemisia lavandulaefolia |
| title | Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia |
| title_full | Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia |
| title_fullStr | Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia |
| title_full_unstemmed | Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia |
| title_short | Concentration-dependent interactive toxicity of cadmium and mercury: Non-negligible effects on phytoremediation by indigenous Artemisia lavandulaefolia |
| title_sort | concentration dependent interactive toxicity of cadmium and mercury non negligible effects on phytoremediation by indigenous artemisia lavandulaefolia |
| topic | Cadmium Mercury Combined Interaction Antioxidants Trade-off Artemisia lavandulaefolia |
| url | http://www.sciencedirect.com/science/article/pii/S0147651325001393 |
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