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| Effects of Cd, Pb, and Zn combined stress on Cd accumulation and translocation in Populus yunnanensis seedlings |
| Received:July 07, 2022 |
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| KeyWord:Populus yunnanensis;heavy metal combined stress;heavy metal interaction;Cd;accumulation;translocation |
| Author Name | Affiliation | E-mail | | WANG Yanxia | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China
Key Laboratory of Ecological Environment Evolution and Pollution Control in Mountainous and Rural Areas of Yunnan Province, Kunming 650224, China | | | ZHENG Wuyang | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | HOU Lei | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | HE Chengzhong | College of Life Science, Southwest Forestry University, Kunming 650224, China | hcz70@163.com | | LANG Shuang | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | YAN Xiaoming | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | LI Size | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | |
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| Abstract: |
| In order to explore the interactions of metals in the combined pollutants Cd-Pb, Cd-Zn, and Cd-Pb-Zn, seedlings of Populus yunnanensis were selected, and the characteristics of Cd enrichment and transport under the single and combined stress of Cd(50 mg · kg-1), Pb(500 mg · kg-1) and Zn(500 mg · kg-1) were analyzed by soil pot experiments, to provide a reference for the restoration and utilization of mining areas where P. yunnanensis occurs. The results showed that:both single and combined stresses significantly reduced the height growth rate of P. yunnanensis seedlings and increased the growth rate of the ground diameter. The height growth rate decreased the most under the Cd-Pb-Zn combined stress(24.45%), and the increase rate of the ground diameter was the highest under the Cd-Zn stress(317.04%). The biomass decreased significantly only under the Cd-Pb-Zn combined stress, with a decrease of 30.28%. Compared with the single Cd stress, the Cd-Pb stress significantly increased the content of Cd in the stem of P. yunnanensis, whereas the Cd-Zn and Cd-Pb-Zn combined stresses significantly reduced the content of Cd in the roots, stems, and leaves. The accumulation of Cd was 0.32 mg· pot-1 under the single Cd stress. The Cd-Pb stress did not significantly change the accumulation of Cd(0.34 mg·pot-1), while the Cd-Zn (0.14 mg·pot-1) and Cd-Pb-Zn(0.13 mg·pot-1) combined stresses significantly reduced the accumulation. The results of bioaccumulation and translocation factors of Cd in P. yunnanensis under different stress conditions showed that the interaction between Pb and Cd(Pb×Cd) promoted Cd accumulation from the soil and enhanced Cd translocation, showing a synergistic effect. The interaction between Zn and Cd inhibited the accumulation of Cd, but increased the translocation of the absorbed Cd to the shoot, showing an antagonistic and synergistic effect on Cd accumulation and translocation, respectively. The interactions among Pb, Zn, and Cd inhibited both the accumulation and translocation of Cd, showing an antagonistic effect. This study shows that P. yunnanensis seedlings exhibite tolerance to the combined stress of Cd-Pb and Cd-Zn, and that the effects of heavy metal combined stress on Cd accumulation and translocation depend on the type of metal interaction and the specific plant organ. |
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