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標題: Potential threat of a new pathotype of Papaya leaf distortion mosaic virus infecting transgenic papaya resistant to Papaya ringspot virus
作者: Bau, H.J.
Kung, Y.J.
Raja, J.A.J.
Chan, S.J.
Chen, K.C.
Chen, Y.K.
Wu, H.W.
Yeh, S.D.
關鍵字: coat protein gene;cylindrical-inclusion protein;complete;nucleotide-sequence;capsid protein;carica-papaya;potyvirus;transformation;variability;protection;strains
Project: Phytopathology
期刊/報告no:: Phytopathology, Volume 98, Issue 7, Page(s) 848-856.
A virus identified as a new pathotype of Papaya leaf distortion mosaic virus (PLDMV, P-TW-WF) was isolated from diseased papaya in an isolated test-field in central Taiwan, where transgenic papaya lines resistant to Papaya ringspot virus (PRSV) were evaluated. The infected plants displayed severe mosaic, distortion and shoe-stringing on leaves; stunting in apex; and water-soaking on petioles and stems. This virus, which did not react in enzyme-linked immunosorbent assay with the antiserum to the PRSV coat protein, infected only papaya, but not the other IS plant species tested. Virions studied under electron microscope exhibited mor-phology and dimensions of potyvirus particles. Reverse transcription-polymerase chain reaction conducted using potyvirus-specific primers generated a 1,927-nucleotide product corresponding to the 3' region of a potyvirus, showing high sequence identity to the CP gene and 3' non-coding region of PLDMV. Search for similar isolates with the antiserum against CP of P-TW-WF revealed scattered occurrence of PLDMV in Taiwan. Phylogenetic analysis of PLDMV isolates of Taiwan and Japan indicated that the Taiwan isolates belong to a separate genetic cluster. Since all the Taiwan isolates infected only papaya, unlike the cucurbit-infecting Japanese P type isolates, the Taiwan isolates are considered a new pathotype of PLDMV. Susceptibility of all our PRSV-resistant transgenic papaya lines to PLDMV indicates that the virus is an emerging threat for the application of PRSV-resistant transgenic papaya in Taiwan and elsewhere.
ISSN: 0031-949X
DOI: 10.1094/phyto-98-7-0848
Appears in Collections:植物病理學系

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