Papaya mosaic virus

Papaya mosaic virus (PapMV)
Virus classification
Group: Group IV ((+)ssRNA)
Order: Tymovirales
Family: Alphaflexiviridae
Genus: Potexvirus
Species: Papaya mosaic virus
Synonyms
  • Papaya mosaic potexvirus
  • Babaco yellow mosaic virus
  • Boussingaultia mosaic virus
  • Papaw mild 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.[1]

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[2] 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[3] that can be seen in leaf strips of infected plants[4][5] when stained with either the Orange-Green protein stain or the Azure A nucleic acid stain.[6][7]

Hosts, Symptoms and Distribution

Its principle 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 1962[8] 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,[9] inclusions, and aphid transmissibility.[10]

PapMV causes mild mosaic symptoms on papaya leaves and stunting of the plant.[11] It is known to occur in South America (Bolivia, Peru, and Venezuela) and the USA.

See also

References

  1. ↑ Flexous rods of Papaya mosaic virus
  2. ↑ http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?db=nucleotide&val=D13957
  3. ↑ Inclusions of PapMV stained in Azure A
  4. ↑ Zettler, F.W., Edwardson, J.R. and Purcifull, D.E. 1968. Phytopathology 58: 332
  5. ↑ Purcifull, D.E., Edwardson, J.R. and Christie, R.G. (1966). Virology 29: 276.
  6. ↑ Christie, R.G. and Edwardson, J.R. (1977). Fla Agric. Exp. Stn Monog. No. 9, 150 pp.
  7. ↑ How to Stain for Plant Virus Inclusions
  8. ↑ Conover, R.A. 1962. Phytopathology 52: 6.
  9. ↑ de Bokx, J.A. 1965. Pl. Dis. Reptr 49: 742
  10. ↑ Cook & Zettler, Pl. Dis. Reptr 54: 893, 1970
  11. ↑ Symptoms of Papaya mosaic virus in a papaya leaf
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