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Microplastics promoted cadmium accumulation in maize plants by improving active cadmium and amino acid synthesis

文献类型： 外文期刊

作者： Zhao, Meng 1 ; Xu, Li 2 ; Wang, Xuexia 1 ; Li, Congping 5 ; Zhao, Yujie 3 ; Cao, Bing 1 ; Zhang, Caigui 5 ; Zhang, Jiajia 1 ; Wang, Jiachen 1 ; Chen, Yanhua 1 ; Zou, Guoyuan 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Qual Stand & Testing Technol, Beijing 100097, Peoples R China

3.Minist Agr & Rural Affairs, Agro Environm Protect Inst, Tianjin 300191, Peoples R China

4.Beijing Engn Technol Res Ctr Slow Controlled Rele, Beijing 100097, Peoples R China

5.Qujing Soil Fertilizer Stn, Qujing 655000, Yunnan, Peoples R China

关键词： Microplastics; Cd bioavailability; Metabolism; Microbial community

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 447 卷

页码：

收录情况： SCI

摘要： Combined pollution from microplastics (MPs) and cadmium (Cd) can influence soil environment and soil biota, altering plant growth and development, and Cd mobilization. We investigated the effects of polystyrene (PS) and polypropylene (PP) MPs alongside Cd on soil Cd bioavailability, rhizosphere soil metabolomics, bacterial community structure, and maize (Zea mays L.) growth in two soil types (red soil and cinnamon soil). Although the addition of PS/PP-Cd promoted Cd accumulation in maize plants overall, there were large-particle-size- and small-particle-size-dependent effects in the red soil and cinnamon soil, respectively. The difference is mainly due to the capacity of the large particle size MPs to significantly reduce soil pH, improve soil electrical conductivity (EC), promote active Cd, and intensify Cd mobilization in red soil. In contrast, small-size MPs in cinnamon soil promoted the synthesis and secretion of rhizosphere amino acids and soil metabolites, thus promoting Cd ab-sorption by maize roots. Soil microorganisms also improved Cd bioavailability via C-related functional bacteria. Overall, our study provides novel insights on the potential effects of combined MPs and Cd pollution on soil ecology and agricultural production, enhancing our understanding of rhizosphere metabolites in different soils.

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