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| Effects of polypropylene and polylactic acid microplastics on the physiology and biochemistry of Brassica chinensis L. |
| Received:October 08, 2024 |
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| KeyWord:polylactic acid microplastics;polypropylene microplastics;antioxidant enzyme activities;microelements |
| Author Name | Affiliation | E-mail | | JIANG Lei | College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China | | | JIANG Cuiling | College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China | cljianghhu@163.com | | SUN Lei | College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China | | | FENG Yakun | College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China | | | LU Can | College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China | | | FAN Zequn | College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China | | | YUAN Menglin | Jiangsu Suhe Radiation Technology Co., Ltd, Nanjing 210019, China | |
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| Abstract: |
| To investigate the effects of biodegradable microplastics（BMPs）and non-biodegradable microplastics（NBMPs）on crops, the non-biodegradable polypropylene microplastics（PP-MPs）and biodegradable polylactic acid microplastics（PLA-MPs）were selected in hydroponics experiment. The effects of two kinds of microplastics（MPs）at different concentrations（1, 10, 50 mg·L-1 and 100 mg·L-1）on biomass, chlorophyll, antioxidant capacity and nutrient absorption of Brassica chinensis L. were investigated. Furthermore, the relationships among these factors were analyzed using the partial least squares method-structural equation model（PLS-SEM）. The results showed that both PP-MPs and PLA-MPs inhibited the synthesis of chlorophyll in Brassica chinensis L. at high concentration（100 mg·L-1）, however, the inhibition rate of PLA-MPs on chlorophyll b synthesis was 4.17 times greater than that of PP-MPs（with the maximum decrease being 16.59%）. The levels of superoxide dismutase（SOD）, catalase（CAT）, peroxidase（POD）activity and malondialdehyde（MDA）were significantly increased by PLA-MPs, and the increasing rates were higher than those of PP-MPs, with the maximum increases of 358.38%, 545.68%, 657.87% and 147.47%, respectively. Both types of MPs interfere with the absorption of magnesium（Mg）and copper（Cu）in Brassica chinensis L., thereby adversely affecting its growth and development. The study demonstrated that PLA-MPs exerted a stronger inhibitory effect on growth of Brassica chinensis L. at high concentrations（100 mg·L-1）compared to PP-MPs. |
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