文献类型：期刊文献

英文题名：Microplastics alter Cr accumulation and fruit quality in Cr(VI) contaminated soil-cucumber system during the lifecycle: Insight from rhizosphere bacteria and root metabolism

作者：Gong, Kailin[1];Zhang, Qi[1];Shao, Xuechun[1];Wu, Yonghong[2];Qiao, Zhihua[1];Qiu, Linlin[1];Zhang, Wei[1];Peng, Cheng[1,3]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2024

卷号：912

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20234915145801);WOS:【SCI-EXPANDED(收录号:WOS:001128129400001)】；

基金：This work was supported by the National Natural Science Foundation of China (41825021, 42177395) , the Special Fund of State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants (SEPKL-EHIAEC-202207) , and the Shanghai Science and Technology Committee (22dz1202805) . The authors thank Research Center of Analysis and Test of East China University of Science and Technology for the help on the analysis and test.

语种：英文

外文关键词：Microplastics; Cr(VI); Bioaccumulation; Microbial community; Metabolism; Nutrient content

摘要：Both microplastics and Cr(VI) potentially threaten soil and crops, but little is known about their interaction in the soil-plant system. This study investigated the effect and mechanism of polyethylene (PE), polyamide (PA), and polylactic acid (PLA) microplastics on Cr bioaccumulation and toxicity in a Cr(VI) contaminated soil-cucumber system during the lifecycle. The results show that microplastics had a greater effect on Cr accumulation in cucumber roots, stems, and leaves than in fruits. PE microplastics increased, but PA and PLA microplastics decreased the Cr accumulation in cucumber. Microplastics, especially high-dose, small, and aged microplastics, exacerbated the effects of accumulated Cr in cucumber on fresh weight and fruit yield. The nutrient contents in fruits except soluble sugars were reduced by microplastics. The random forest regression model shows that the microplastic type was the most important factor causing changes in the soil-cucumber system except for Cr(VI) addition. Under Cr(VI) and microplastic co-exposure, bacteria that could simultaneously tolerate Cr(VI) stress and degrade microplastics were enriched in the rhizosphere soil. The partial least squares path model shows that microplastics reduced the beneficial effect of the bacterial community on cucumber growth. Microplastics, especially PLA microplastics, alleviated the adverse effects of Cr(VI) stress on root metabolism.