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Visible-light-driven water-soluble zinc oxide quantum dots for efficient control of citrus canker

文献类型： 外文期刊

作者： Rao, Wenhua 1 ; Yue, Qi 1 ; Gao, Shang 1 ; Lei, Meiling 1 ; Lin, Tao 1 ; Pan, Xiaohong 3 ; Hu, Jinfeng 1 ; Fan, Guocheng 1 ;

作者机构： 1.Fujian Acad Agr Sci, Inst Plant Protect, Fujian Engn Res Ctr Green Pest Management, Fujian Key Lab Monitoring & Integrated Management, Fuzhou 350013, Peoples R China

2.Fujian Acad Agr Sci, Inst Plant Protect, Fuzhou Sci Observing & Expt Stn Crop Pests, Minist Agr & Rural Affairs, Fuzhou, Fujian, Peoples R China

3.Fujian Agr & Forestry Univ, Coll Plant Protect, Fuzhou, Peoples R China

关键词： ZnO quantum dots; citrus canker; antibacterial mechanism; reactive oxygen species; nanopesticides

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.1； 五年影响因子：4.4 ）

ISSN： 1526-498X

年卷期： 2024 年 80 卷 6 期

页码：

收录情况： SCI

摘要： BACKGROUND: Citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is a devastating bacterial disease that reduces citrus yield and quality, posing a serious threat to the citrus industry. Several conventional chemicals have been used to control citrus canker. However, this approach often leads to the excessive use of chemical agents, can exacerbate environmental pollution and promotes the development of resistant Xcc. Therefore, there is significant interest in the development of efficient and environmentally friendly technologies to control citrus canker. RESULTS: In this study, water-soluble ZnO quantum dots (ZnO QDs) were synthesised as an efficient nanopesticide against Xcc. The results showed that the antibacterial activity of ZnO QDs irradiated with visible light [half-maximal effective concentration (EC50) = 33.18 mu g mL(-1)] was 3.5 times higher than that of the dark-treated group (EC50 = 114.80 mu g mL(-1)). ZnO QDs induced the generation of reactive oxygen species (center dot OH, center dot O-2(-) and O-1(2)) under light irradiation, resulting in DNA damage, cytoplasmic destruction, and decreased catalase and superoxide dismutase activities. Transcription analysis showed downregulation of Xcc genes related to 'biofilms, virulence, adhesion' and 'DNA transfer' exposure to ZnO QDs. More importantly, ZnO QDs also promoted the growth of citrus. CONCLUSION: This research provides new insights into the photocatalytic antibacterial mechanisms of ZnO QDs and supports the development of more efficient and safer ZnO QDs-based nanopesticides to control citrus canker. (c) 2024 Society of Chemical Industry.

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