Development of a colloidal gold-based immunochromatographic strip for rapid detection of Rice stripe virus

一种快速检测水稻条纹病毒的胶体金免疫层析试纸条的研制（英文）

Rice stripe virus(RSV) causes dramatic losses in rice production worldwide. In this study, two monoclonal antibodies(MAbs) 16E6 and 11 C1 against RSV and a colloidal gold-based immunochromatographic strip were developed for specific, sensitive, and rapid detection of RSV in rice plant and planthopper samples. The MAb 16E6 was conjugated with colloidal gold and the MAb 11C1 was coated on the test line of the nitrocellulose membrane of the test strip. The specificity of the test strip was confirmed by a positive reaction to RSV-infected rice plants and small brown planthopper(SBPH), and negative reactions to five other rice viruses, healthy rice plants, four other vectors of five rice viruses, and non-viruliferous SBPH. Sensitivity analyses showed that the test strip could detect the virus in RSV-infected rice plant tissue crude extracts diluted to 1:20 480(w/v, g/mL), and in individual viruliferous SBPH homogenate diluted to 1:2560(individual SPBH/μL). The validity of the developed strip was further confirmed by tests using field-collected rice and SBPH samples. This newly developed test strip is a low-cost, fast, and easy-to-use tool for on-site detection of RSV infection during field epidemiological studies and paddy field surveys, and thus can benefit decision-making for RSV management in the field.

目的:制备一种检测水稻植物和传毒介体灰飞虱中水稻条纹病毒(RSV)的胶体金免疫层析试纸条,为水稻条纹叶枯病的田间调查和检测以及预测预警提供快速、实用的检测试剂。创新点:利用制备的RSV单克隆抗体,首次制备了能在5～10 min内快速、准确、灵敏、特异地检测水稻植物和灰飞虱体内RSV的胶体金免疫层析试纸条。方法:以差速离心方法提纯的RSV病毒粒子作为免疫原免疫BALB/c小鼠,通过杂交瘤技术获得了高度特异和灵敏的RSV单克隆抗体。采用柠檬酸钠还原氯金酸的方法制备胶体金并标记一个RSV单克隆抗体,另一个RSV单克隆抗体和羊抗鼠抗体分别包被到硝酸纤维素膜的检测线和质控线,将吸水滤纸制成的样品垫、RSV免疫胶体金垫、结合有RSV单抗和羊抗鼠抗体的硝酸纤维素膜和吸水纸依次粘贴到聚氯乙烯(PVC)胶板上研制检测水稻植物和传毒介体灰飞虱中RSV的胶体金免疫层析试纸条。对田间样品进行RSV检测,分析试纸条检测RSV的有效性。结论:利用杂交瘤技术获得了2株RSV单克隆抗体(16E6和11C1),胶体金标记16E6单克隆抗体包被在聚酯膜制成的结合垫上,以11C1单克隆抗体和羊抗鼠抗体分别包被到硝酸纤维素膜的检测线和质控线,制成能在5～10 min内快速、特异、灵敏、准确地检测田间水稻及单头灰飞虱样品中RSV的胶体金免疫层析试纸条。试纸条检测感染RSV的水稻植株和灰飞虱呈阳性反应,而检测健康水稻和感染其它5种常见水稻病毒的植株及其传毒介体呈阴性反应,且试纸条检测RSV感染水稻植物组织的灵敏度达到1:20 480倍稀释(w/v, g/mL),检测携带RSV单头灰飞虱的灵敏度达到1:2560倍稀释(单头灰飞虱/μL)。田间样品检测结果发现,试纸条检测结果与反转录聚合酶链反应(RT-PCR)的检测结果一致,表明制备的试纸条可有效地用于田间RSV的检测,从而为水稻条纹叶枯病的诊断、监测预警、抗病育种、流行病学研究及科学防治提供技术和物质支撑。