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| Effects of polyethylene microplastics on cadmium absorption and physiological characteristics of peanut seedling |
| Received:December 15, 2021 |
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| KeyWord:polystyrene microplastic;peanut;Cd absorption;physiological characteristic |
| Author Name | Affiliation | E-mail | | ZONG Haiying | School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | | | LIU Jun | School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | | | GUO Xiaohong | School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China | | | LI Meng | Shandong Institute of Sericulture, Yantai 264001, China | | | HUANG Xiaoli | Central Laboratory of Qingdao Agricultural University, Qingdao 266109, China | | | WANG Fangli | School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | | | SONG Ningning | School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | snn05@163.com |
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| Abstract: |
| To better understand the effects of microplastics, cadmium (Cd), and their combination on the physiological characteristics and Cd uptake of crops, polyethylene microplastics (PE) and Cd were used as experimental materials to measure the variations in malondialdehyde (MDA) content, antioxidant enzyme activities, root activity, and Cd uptake after peanut seedlings were cultured in single and binary solutions of PE (50 mg·L-1 and 200 mg·L-1) and Cd (25 μmol·L-1 and 100 μmol·L-1). Results showed that peanuts biomass significantly increased under low PE concentration (50 mg·L-1); however, peanut biomass significantly decreased under high PE concentration (200 mg·L-1), which significantly increased MDA content and inhibited the root activity in single PE system. Compared to PE at 0 mg·L-1, PE at 50 mg·L-1 and 200 mg·L-1 significantly induced MDA production, increased antioxidant enzyme activities, inhibited root activity, reduced biomass, and promoted Cd absorption in peanut seedlings, especially under 100 μmol·L-1 Cd. In addition, 50 mg·L-1 and 200 mg· L-1 PE increased the Cd concentration in the root by 60.9% and 78.8%, respectively in the binary systems. Moreover, double factor variance analysis showed that PE and Cd interaction had significant effects on the physiological characteristics and plant Cd uptake. These results suggest that there is a synergistic toxicity on crop under MPs and Cd combined pollution. |
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