Development and application of reverse transcription-loop mediated isothermal amplification assay for sensitive detection of groundnut bud necrosis virus infecting potato

• Published in: Virology (New York, N.Y.) N.Y.), 2023-10, Vol.587, p.109872-109872, Article 109872
• Main Authors: Raigond, Baswaraj, Pathania, Shruti, Verma, Gaurav, Bhardwaj, Pooja, Kochhar, Tarvinder, Chakrabarti, S.K.
• Format: Article
• Language: English
• Subjects: Detection; Groundnut bud necrosis virus; LAMP; Orthotospovirus arachinecrosis; Potato; RT-PCR; Thrips
• ISSN: 0042-6822; 1096-0341
• DOI: 10.1016/j.virol.2023.109872

Reverse-transcription loop-mediated isothermal amplification (RT-LAMP) assay was developed for detection of groundnut bud necrosis virus (GBNV) causing potato stem necrosis disease. The isothermal temperatures, reaction periods and concentrations of reaction mixture were optimized where, the assay worked well at 65 °C for 50 min, 6 U of WarmStart Bst 2.0 DNA polymerase, 1.4 mM dNTPs and 2.0 mM MgSO4. The optimized assay proved to be specific to GBNV with no cross reactivity to other viruses infecting potato in India. The specificity of RT-LAMP assay was found to be 100 fold more sensitive than that of RT-PCR. The developed assay was applied for the detection of GBNV from 80 potato leaf samples where 24 samples were found infected which was confirmed by RT-PCR. It was concluded that the RT-LAMP assay developed for detection of GBNV was specific, sensitive and suitable for its use in virus indexing under potato seed production programme. •Developed RT-LAMP assay for specific and sensitive detection of GBNV infecting potato.•The assay was proved to be highly specificity without any cross-reactivity.•The developed RT-LAMP assay proved to be 100 fold more sensitive as compared to RT-PCR.•Developed assay was applied for detection of GBNV from unknown potato leaf samples.