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| Effects of microplastics and cadmium on the growth and physiological characteristics of cabbage |
| Received:December 10, 2024 |
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| KeyWord:polyethylene microplastics;cadmium;combined effects;pot experiment;PLS-PM |
| Author Name | Affiliation | E-mail | | XIAO Jianyong | Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101314, China | | | LIU Yuexian | College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101314, China | liuyuexian@ucas.ac.cn |
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| Abstract: |
| To investigate the effects of microplastics and cadmium（Cd） on plant growth under single and combined conditions, polyethylene microplastics（PE-MPs）, which are widely distributed in the soil environment, and cabbage（Brassica campestris L.）, a popular vegetable in daily life, were used in the pot experiment. Through indoor pot experiments, the differences in cabbage growth, physiological indicators, and Cd uptake under different concentration gradients of PE-MPs（0.5%, 2%, 4%）and Cd（1 mg·kg-1）in single and combined treatments were studied. The results showed that both PE-MPs and Cd treatments significantly inhibited the growth of cabbage, with the toxic effect of single Cd treatment being stronger than that of single PE-MPs treatment. PE-MPs only significantly reduced cabbage biomass at the high concentration of 4%, and a similar trend was observed in the changes of chlorophyll content, especially at the high concentration（4%）. Low concentration（0.5%）of PE-MPs alleviated the oxidative stress caused by Cd to some extent, but as the concentration of PE-MPs increased, this mitigating effect weakened and even turned into aggravated oxidative damage. The malondialdehyde（MDA）content in the medium and high concentration（2% and 4%）PE-MPs and Cd combined treatment groups increased by 60.53% and 141.47%, respectively, compared to the corresponding single PE-MPs treatments. Besides, the addition of PEMPs significantly reduced the content of available Cd in the soil but did not significantly alter the uptake of Cd by cabbage. The results of partial least squares path modeling（PLS-PM）indicated that under single PE-MPs treatment, the quality of cabbage was primarily directly and negatively affected by PE-MPs addition. In contrast, the combined treatment of PE-MPs and Cd indirectly influenced the quality of Chinese cabbage by affecting its Cd content. |
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