One-step reverse transcription-recombinase polymerase amplification (RT-RPA) optimization for potato leafroll virus (PLRV) detection using forward and reverse primer LRRPAF3/R3-Set C. Utilization of two RNA isolation methods, viz., cellular disc paper-technique [28] and SpectrumTM Plant Total RNA kit (Sigma-Aldrich, St. Louis, MO, USA). The agarose gel images visualize the amplicons when the respective concentration of sodium sulphite ranging from 0.25 to 1.0% for the respective method of RNA extraction has been used. HC: healthy potato mini tuber sample, NC: negative control, Lane M: 50 bp marker.