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Two agroinfection-compatible fluorescent protein-tagged infectious cDNA clones of papaya leaf distortion mosaic virus facilitate the tracking of virus infection.

Papaya leaf distortion mosaic virus (PLDMV, the genus Potyvirus) is an emerging threat to papaya production. Here, agroinfection-compatible fluorescent protein-tagged PLDMV infectious cDNA clones driven by the Cauliflower mosaic virus 35S promoter were successfully constructed using one-step Gibson assembly. The clones were directly transformed into Agrobacterium tumefaciens to prevent potential problems such as plasmid instability during propagation in Escherichia coli. Ninety-five percent of papaya seedlings infected with PLDMV-GFP or PLDMV-mCherry developed systemic symptoms typical of those caused by wild-type PLDMV. Green and mCherry red fluorescence was observed in leaves, stems, and roots of infected papaya plants. The fluorescent protein-tagged agroinfectious PLDMV cDNA clones were stable in papaya for more than 90 days and during six serial passages at 30-day intervals. The availability of these infectious clones will contribute to research on PLDMV-host interactions and can be applied in the papaya breeding program for PLDMV resistance.

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