Papaya mosaic virus

Papaya mosaic virus (PapMV) is a plant pathogenic virus in the genus Potexvirus and the family Alphaflexiviridae. PapMV is a filamentous, flexuous rod, 530 nm in length.

The virus is a monopartite strand of positive-sense, single-stranded RNA surrounded by a capsid made for a single viral encoded protein. The genome has been completely sequenced and is 6656 nucleotides long. It is transmitted by mechanical inoculation. No insect vector is involved and it is not transmitted in seeds.

Mature virions form banded inclusions that can be seen in leaf strips of infected plantsZettler, F.W., Edwardson, J.R. and Purcifull, D.E. 1968. Phytopathology 58: 332Purcifull, D.E., Edwardson, J.R. and Christie, R.G. (1966). Virology 29: 276. when stained with either the Orange-Green protein stain or the Azure A nucleic acid stain.Christie, R.G. and Edwardson, J.R. (1977). Fla Agric. Exp. Stn Monog. No. 9, 150 pp.

Hosts, symptoms and distribution Its principal host is papaya (Carica papaya), although in host range studies, PapMV was able to infect a few other plants including snapdragons (Antirrhinum majus). It is also reported to naturally infect Ullucus tuberosus.

PapMV was first reported in papaya in 1962Conover, R.A. 1962. Phytopathology 52: 6. together with another virus that became known as Papaya ringspot virus (PRSV), a potyvirus. The two viruses were differentiated in 1965 and 1967 using particle lengths, serology, host range,de Bokx, J.A. 1965. Pl. Dis. Reptr 49: 742 inclusions, and aphid transmissibility.Cook & Zettler, Pl. Dis. Reptr 54: 893, 1970

PapMV causes mild mosaic symptoms on papaya leaves and stunting of the plant.Symptoms of Papaya mosaic virus in a papaya leaf It is known to occur in South America (Bolivia, Peru, and Venezuela) and the USA.

Papaya mosaic virus

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