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Management of viral diseases relies on definite and sensitive detection methods. Citrus yellow mosaic virus (CYMV), a double stranded DNA virus of the genus Badnavirus, causes yellow mosaic disease in citrus plants. CYMV is transmitted through budwood and requires a robust and simplified indexing protocol for budwood certification programme. The present study reports development and standardization of an isothermal based recombinase polymerase amplification (RPA) assay for a sensitive, rapid, easy, and cost-effective method for detection and diagnosis of CYMV. Two different oligonucleotide primer sets were designed from ORF III (coding for polyprotein) and ORF II (coding for virion associated protein) regions of CYMV to perform amplification assays. Comparative evaluation of RPA, PCR and immuno-capture recombinase polymerase amplification (IC-RPA) based assays were done using purified DNA and plant crude sap. CYMV infection was efficiently detected from the crude sap in RPA and IC-RPA assays. The primer set used in RPA was specific and did not show any cross-amplification with banana streak MY virus (BSMYV), another Badnavirus species. The results from the present study indicated that RPA assay can be used easily in routine indexing of citrus planting material. To the best of our knowledge, this is the first report on development of a rapid and simplified isothermal detection assay for CYMV and can be utilized as an effective technique in quarantine and budwood certification process.

An isothermal based recombinase polymerase amplification assay for rapid, sensitive and robust indexing of citrus yellow mosaic virus