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Joint toxicity of cadmium (II) and microplastic leachates on wheat seed germination and seedling growth

文献类型： 外文期刊

作者： Du, Ling 1 ; Wu, Dongming 2 ; Yang, Xi 1 ; Xu, Li 3 ; Tian, Xu 1 ; Li, Youping 1 ; Huang, Lijuan 4 ; Liu, Yanmei 1 ;

作者机构： 1.China West Normal Univ, Coll Environm Sci & Engn, Nanchong 637009, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou 571101, Peoples R China

3.Cuiping Ecol Environm Bur Yibin City, Yibin 644000, Peoples R China

4.Guangyuan Ecol Environm Monitoring Ctr Stn, Guangyuan 628040, Peoples R China

关键词： Aged microplastics; Heavy metals; Seed germination; Seedling growth; Oxidative stress

期刊名称：ENVIRONMENTAL GEOCHEMISTRY AND HEALTH （ 影响因子：4.2； 五年影响因子：4.4 ）

ISSN： 0269-4042

年卷期： 2024 年 46 卷 5 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) pollution ranks first in soils (7.0%) and microplastics usually have a significant adsorption capacity for it, which could pose potential threats to agricultural production and human health. However, the joint toxicity of Cd and microplastics on crop growth remains largely unknown. In this study, the toxic effects of Cd2+ and two kinds of microplastic leachates, polyvinyl chloride (PVC) and low-density polyethylene (LDPE), on wheat seed germination and seedlings' growth were explored under single and combined conditions. The results showed that Cd2+ solution and two kinds of microplastic leachates stimulated the wheat seed germination process but inhibited the germination rate by 0-8.6%. The combined treatments promoted wheat seed germination but inhibited the seedlings' growth to different degrees. Specifically, the combination of 2.0 mg L-1 Cd2+ and 1.0 mgC L-1 PVC promoted both seed germination and seedlings' growth, but they synergistically increased the antioxidant enzyme activity of seedlings. The toxicity of the PVC leachate to wheat seedlings was stronger than LDPE leachate. The addition of Cd2+ could alleviate the toxicity of PVC leachate on seedlings, and reduce the toxicity of LDPE leachate on seedlings under the same concentration class combinations but aggravated stress under different concentration classes, consistent with the effect on seedlings' growth. Overall, Cd2+, PVC, and LDPE leachates have toxic effects on wheat growth, whether treated under single or combined treatments. This study has important implications for the joint toxicity of Cd2+ solution and microplastic leachates in agriculture.

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