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标题：Comparative physiological and metabolomic analyses revealed that foliar spraying with zinc oxide and silica nanoparticles modulates metabolite profiles in cucumber (Cucumis sativus L.)
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作者：Sen Li ; Juan Liu ; Yibo Wang 等
期刊名称：Food and Energy Security
印刷版ISSN：2048-3694
电子版ISSN：2048-3694
出版年度：2021
卷号：10
期号：1
页码：e269
DOI：10.1002/fes3.269
出版社：John Wiley & Sons, Ltd.
摘要：Previous studies have reported crop toxicity of zinc oxide nanoparticles (ZnO‐NPs) by root exposure and that silica nanoparticles (SiO 2 ‐NPs) modulate crop growth and soil physicochemical properties. In this study, we determined the effects of foliar exposure to ZnO‐NPs and SiO 2 ‐NPs on the growth and metabolomic profile of cucumber seedlings. Foliar spraying with ZnO‐NPs and SiO 2 ‐NPs improved cucumber plant performance, as indicated by increases in chlorophyll contents, chlorophyll fluorescence parameters, and the fresh/dry weights of leaves and roots. According to metabolomic analysis results, foliar exposure to ZnO‐NPs and SiO 2 ‐NPs induced pronounced changes in the metabolome, especially in the leaves. Besides, ZnO‐NP or SiO 2 ‐NP treatments either upregulated or downregulated the contents of amino acids, organic acids, sugars and glycosides, and secondary metabolites, indicating that the two NPs affected both primary metabolism and secondary metabolism. The elevated levels of several secondary metabolites involved in antioxidative defense imply that the two NPs potentially regulate stress resistance in plants. Overall, these results indicate that different from root exposure, foliar exposure to ZnO‐NPs or SiO 2 ‐NPs is beneficial to plant growth. The present study provides a theoretical basis for the environmental assessment and application of these two NPs in agricultural production.
关键词：cucumber;foliar exposure;metabolome;silica nanoparticles;zinc oxide nanoparticles