Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Strawberry mild yellow edge-associated (?) potexvirus

Index

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

Data collated by W. Jelkmann, 1991.

Nomenclature

Acronym

SMYEaV

ICTV decimal code

56.0.1.T.019

Host range and symptoms

Natural host range and symptoms

• Fragaria vesca - chlorotic flecks in young leaves, gradual loss of vigour, chlorotic mottling, interveinal necrosis of older leaves.
• Rubus rosifolius, Chenopodium quinoa - symptomless.

Transmission

Transmitted by a vector; an insect; Chaetosiphon fragaraefolii; Aphididae. Transmitted in a non-persistent manner. Virus possibly requires, for vector transmission, a helper virus (strawberry mild yellow edge luteovirus); transmitted by mechanical inoculation; transmitted by grafting.

Ecology and control

Studies reported by Converse et al. (1987).

Geographical distribution

Probably distributed worldwide. Spreads in Australia, Belgium, Bulgaria, Canada, Chile, China, the former Czechoslovakia, France, Germany, Ireland, Israel, Italy, Japan, Luxembourg, New Zealand, Paraguay, South Africa, Switzerland, the UK, the USA.

Assay hosts (Local lesions or Whole plants)

Fragaria vesca UC4 (W), UC5 (W), EMC (W), F. vesca var. semperfloreus `Alpine' (W).

Susceptible host species

• Chenopodium murale
• Chenopodium quinoa
• Fragaria vesca
• Rubus rosifolius

Families containing susceptible hosts

• Chenopodiaceae (2/2)
• Rosaceae (2/2)

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions.

Particle morphology

Virions filamentous; usually flexuous; with a clear modal length; of 482 nm; 13 nm wide.

Biochemical properties

Genome consists of RNA; single-stranded; linear. Total genome size 5.966 kb. Genome unipartite; largest (or only) genome part 5.966 kb. Poly A region present. Nucleotide sequence references: Jelkmann et al. (1991).

NCBI sequence data (Entrez search)

Sequence database accession code(s)

• D12515 Em(40)_vi:SYVCPH Gb(84)_vi:SYVCPH Strawberry mild yellow edge-associated virus (SMYEAV), 3´terminus of the viral genome encodin
• D12517 Em(40)_vi:SYVCPE Gb(84)_vi:SYVCPE Strawberry mild yellow edge-associated virus (SMYEAV) genomic RNA encoding coat protein and 5 2 sequences.

Features of the genome

4 virus specified dsRNA species found in infected cells. Size of largest virus specified dsRNA 6 kbp; 2nd largest 4.2 kbp; 3rd largest 1.7 kbp; 4th largest 0.5 kbp.

Features of proteins

Virion protein(s) one; M_r 25714. Method of preparation: Jelkmann et al. (1990). Amino acid sequence: Jelkmann et al. (1991). Amino acid composition: Jelkmann et al. (1991).

Virus-coded non-virion proteins identified by genomic sequence analysis; five proteins found (ORFs in genome in addition to coat protein). M_r of the largest 149423; probably replicase. M_r of 2nd largest 25344. M_r of 3rd 11576. M_r of 4th 11216. M_r of 5th and smaller 8079.

Cytopathology

Virions found in the companion cells.

Taxonomy and relationships

Possible Potexvirus

Virus(es) with serologically related virions

Chicory X, cassava Colombian common mosaic, papaya mosaic, Sieg river potexviruses and, but distantly, wineberry latent virus.

Virus(es) with serologically unrelated virions

Plantago Argentinian, cactus X, cassava common mosaic (WF), clover yellow mosaic, cymbidium mosaic, daphne X, hydrangea ringspot, lily X, lychnis potex, narcissus mosaic, pepino mosaic, plantago X, potato aucuba mosaic, potato X, Tamus potex, tulip X, viola mottle and white clover mosaic viruses.

Additional comments on relationships

The sequence of the coat protein of SMYEAV, like that of other potexviruses, has significant homologies with the protein sequences of carlaviruses.

Best tests for diagnosis

ISEM useful, antisera prepared from coat protein expressed as a fusion protein in E. coli.

Comments and References

References

• Converse, R.H., Martin, R.R. and Spiegel, S. (1987). In: Virus Diseases of Small Fruits; ed. R.H. Converse. U.S. Dep. Agric. Hdbk No. 631, p. 25.
• Horne, W.T. (1922). Rep. Cal. Exp. Stn. 1921-1922, p. 122.
• Jelkmann, W., Maiss, E. and Martin, R.R. (1990). Abstr. 8th Int. Congr. Virol., p. 1445.
• Jelkmann, W., Maiss, E. and Martin, R.R. (1991). J. gen. Virol. submitted.
• Jelkmann, W., Martin, R.R. and Maiss, E. (1989). Phytopathology 79: 1250.
• Jelkmann, W., Martin, R.R., Lesemann, D.-E., Vetten, H.J. and Skelton, F. (1990). J. gen. Virol. 71: 1251.
• Martin, R.R., Jelkmann, W., Spiegel, S. and Converse, R.H. (1989). Acta Hort. 236: 111.

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.