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| Effects of polyethylene microplastics on the growth and quality of Chinese cabbage in three consecutive seasons |
| Received:November 06, 2024 |
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| KeyWord:microplastics;concentration;quality of Chinese cabbage;persistent effect |
| Author Name | Affiliation | E-mail | | WEI Kongyang | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
University of Chinese Academy of Sciences, Beijing 101408, China | | | YANG Min | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | HE Shuangling | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
University of Chinese Academy of Sciences, Beijing 101408, China | | | HUANG Daoyou | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | ZHU Qihong | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | qhzhu@isa.ac.cn |
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| Abstract: |
| In order to explore the response characteristics of Chinese cabbage（Brassica chinensis L.）to high-density polyethylene（HDPE） microplastics stress, a pot experiment was conducted over three consecutive growing seasons. The study examined the effects of different concentrations of HDPE microplastics（2.50, 5.00, 10.00, 20.00 g·kg-1）, with particle sizes ranging from 48 μm to 150 μm, on the growth and nutritional quality of Chinese cabbage, as well as soil nutrient availability. The results showed that HDPE microplastics significantly inhibited the growth and photosynthesis of Chinese cabbage. The fresh weight of Chinese cabbage decreased significantly by 15.31%-31.48% in first season and by 12.16%-29.53% in the second season. The total content of chlorophyll b and chlorophyll a+b decreased by 45.45%-84.47% and 33.22%-70.18%, respectively. Additionally, the nutritional quality of Chinese cabbage in the three seasons also changed significantly. The starch content decreased by 6.95%-61.60%, the soluble sugar content increased by 4.02%-134.14%, and the manganese content of the plant decreased by 69.15%（in the second season）. In addition, the changes of growth and quality indexes of Chinese cabbage under the influence of microplastics were significantly correlated with the reduction of available manganese content in soil and manganese content in Chinese cabbage plants. In general, the effects of HDPE microplastics on the growth and quality of Chinese cabbage increased with the increase in concentration but decreased with the extension of planting season. The change in manganese availability in soil and the direct effect of microplastics on crop roots may be the important reasons influencing the growth and quality of Chinese cabbage. |
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