Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Potato A potyvirus

Index

• Nomenclature
• Host range, transmission and symptoms
• Physical and biochemical properties
• Taxonomy and relationships
• Comments and References

Data collated by C. Büchen-Osmond, 1987.

Nomenclature

Synonyms

potato mild mosaic virus, potato virus P, Solanum virus 3.

Acronym

PVA

ICTV decimal code

57.0.1.0.056

Host range and symptoms

Natural host range and symptoms

Symptoms persist.
• Solanum tuberosum - mild mosaic, leaf surface rough with wavy margins, or symptomless.
  Potatoes infected with potato virus A in combination with potato virus X and Y show crinkle symptoms.

Transmission

Transmitted by a vector; an insect; Aphis frangulae, A. nasturtii, Myzus persicae; Aphididae. Transmitted in a non-persistent manner. Virus does not require a helper virus for vector transmission and can help the vector transmission of another virus (potato aucuba mosaic potexvirus; Clinch et al., 1936); transmitted by mechanical inoculation; not transmitted by seed.

Geographical distribution

Probably distributed worldwide (in most potato growing areas).

Experimental host range

Few (<3) families susceptible.

Diagnostically susceptible host species and symptoms

• Nicotiana tabacum cv. Samsun - systemic vein-clearing and diffuse mottling.
• N. tabacum cv. White Burley - systemic vein-clearing and dark green vein-banding.
• Nicandra physalodes - systemic slight vein-clearing and mottle to severe necrosis, rugosity and stunting.
• Lycopersicon pimpinellifolium - systemic necrosis and death. (MacLachlan et al., 1953).
• Solanum demissum × S. tuberosum cv. Aquila (=A6 hybrid) and S. demissum SdA - many local lesions.

Maintenance and propagation hosts

Nicotiana tabacum cv. Samsun.

Assay hosts (Local lesions or Whole plants)

Solanum demissum × S. tuberosum cv. Aquila (L) (Köhler, 1953; Bartels, 1970), Solanum demissum SdA (L), Nicandra physalodes (W) is useful for aphid transmission tests with Myzus persicae.

Susceptible host species

• Lycopersicon pimpinellifolium
• Nicandra physalodes
• Nicotiana tabacum
• Solanum demissum
• Solanum demissum × S. tuberosum
• Solanum tuberosum

Families containing susceptible hosts

• Solanaceae (6/6)

Physical and biochemical properties

Properties of particles in sap

TIP: 44-52 °C. LIV: 0.5-0.75 days (12-18 hours MacLachlan et al., 1953). DEP: log₁₀ minus 1.

Purification method

Bartels (1971).

Particle morphology

Virions filamentous; not enveloped; usually flexuous; with a clear modal length; of 730 nm; 11 nm wide (Brandes and Paul, 1957).

Biochemical properties

Genome consists of RNA; single-stranded.

NCBI sequence data (Entrez search)

Sequence database accession code(s)

• S51667 Em(40)_un:S51667 Gb(84)_vi:S51667 polyprotein potato virus A PVA, Genomic RNA, 2597 nt. 3/93 2,597bp.
• X59985 Em(40)_vi:PVACOATM Gb(84)_vi:PVACOATM Potato virus A RNA 3´-terminal for coat protein and polymerase. 6/93 1,383bp
• Z21670 Em(40)_vi:PVCGA Gb(84)_vi:PVCGA Potato virus A complete genome. 2/94 9,585bp.
• Z49087 Em(43)_vi:Pvaunibcp Gb(89)_vi:Pvaunibcp Potato virus A (USA) mRNA for nuclear inclusion b (partial) and coat protein. 4/95 1,108bp.
• Z49088 Em(43)_vi:Pvamnibcp Gb(89)_vi:Pvamnibcp Potato virus A (Maine) mRNA for nuclear inclusion b (partial) and coat protein. 4/95 1,110bp.

Replication

Replication does not depend on a helper virus.

Cytopathology

Virions found in all parts of the host plant; in cytoplasm. Inclusions present in infected cells.

Taxonomy and relationships

Potyvirus: Potyviridae

Virus(es) with serologically related virions

Potato Y (common and tobacco veinal necrosis strain), henbane mosaic and tobacco etch viruses.

Best tests for diagnosis

Potato may be infected by potato A, potato Y and other potyviruses. They are more easily distinguished serologically although only potato virus A induces local lesions in Solanum demissum SdA.

Comments and References

References

• Bartels, R. (1970). Potato Res. 13: 119.
• Bartels, R. (1971). CMI/AAB Descr. Pl. Viruses No. 54, 4 pp.
• Brandes, J. and Paul, H.L. (1957). Arch. Microbiol. 26: 358.
• Clinch, P., Loughnane, J.B. and Murphy, D.A. (1936). Scient. Proc. R. Dubl. Soc. 21: 431.
• Köhler, E. (1953). Züchter 23: 173.
• MacLachlan, D.S., Larson, R.H. and Walker, J.C. (1953). Res. Bull. agric. Exp. Stn Univ. Wis., 180, 36 pp.
• Murphy, P.A. and McKay, R. (1932). Scient. Proc. R. Dubl. Soc. 20: 347.

Cite this publication as: Brunt, A.A., Crabtree, K., Dallwitz, M.J., Gibbs, A.J., Watson, L. and Zurcher, E.J. (eds.) (1996 onwards). `Plant Viruses Online: Descriptions and Lists from the VIDE Database. Version: 20^th August 1996.' URL http://biology.anu.edu.au/Groups/MES/vide/

Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993) should also be cited.