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| Physiological response of cucumber seedlings to microplastics and cadmium |
| Received:November 11, 2019 |
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| KeyWord:microplastic;cadmium;cucumber;physiological indices |
| Author Name | Affiliation | | LI Zhen-xia | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China
Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang 453003, China | | LI Qing-fei | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China
Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang 453003, China | | LI Rui-jing | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China | | ZHAO Ya-fei | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China | | GENG Jia-hui | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China | | SUN Yong-dong | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China
Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang 453003, China | | ZHOU Jun-guo | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China
Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang 453003, China | | WANG Guang-yin | College of Horticulture and Landscape, Henan Institute of Science and Technology, Xinxiang 453003, China
Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang 453003, China |
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| Abstract: |
| To investigate the physiological effects of microplastic and cadmium pollution in the soil, the physiological characteristics of the roots and leaves of cucumber (Cucumis sativus L.)seedlings were examined after treatment with two different sizes of polyvinyl chloride particles (A, particle size:<18 μm and B, particle size:18~150 μm)and a dose of cadmium (20 mg·kg-1). The results showed that microplastics A and B alleviated the effect of cadmium on root activity. Microplastic A significantly reduced the total root length, but had no significant effect on the root diameter of the cucumber seedlings. Pollution by the combination of microplastics A and B and cadmium had no superposition effect on the superoxide diamutase (SOD)activity and H2O2 content of the leaves. Instead, it showed a neutralization effect. Microplastic B mitigated the effect of cadmium on malondialdehyde (MDA)content. The different microplastic particle sizes had different effects on the photosynthetic pigments and fluorescence parameters. Microplastic A significantly reduced the effect of cadmium on the carotenoids of cucumber leaves. The light absorption and dissipation capacity of cucumber leaves treated with microplastic B was higher than that of leaves treated with microplastic A. Pollution by the combination of microplastic B and cadmium reduced the light dissipation ability of cucumber leaves but improved their light capture ability. A gray correlation analysis showed that the effects of microplastics A and B on the physiological indices differed from that of cadmium. The cadmium treatment had a greater correlation with H2O2 content, whereas the treatments with microplastics A and B had greater correlations with photosynthetic indices. This study provides insights useful in the ecological risk assessment of microplastic and cadmium pollution in farmland. |
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