Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Rice yellow mottle sobemovirus

Index

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

Data collated by A.A. Brunt and W. Bakker, 1987.

Nomenclature

Acronym

RYMV

ICTV decimal code

67.0.1.0.005

Host range and symptoms

Natural host range and symptoms

Symptoms persist.
• Oryza sativa - yellow or orange leaves, stunting, reduced tillering and sterility.
• Oryza longistaminata - chlorosis and mottling.

Transmission

Transmitted by a vector; an insect; Sesselia pusilla, Chaetocnema pulla, Trichispa serica and Dicladispa viridicyanea; Coleoptera. Transmitted in a semi-persistent manner. Virus lost by the vector when it moults; does not multiply in the vector; not transmitted congenitally to the progeny of the vector; does not require a helper virus for vector transmission; transmitted by mechanical inoculation; not transmitted by seed.

Ecology and control

Studies reported by Bakker (1970, 1971, 1974); Fauquet and Thouvenel (1977); Rossel et al. (1982); John et al. (1984).

Geographical distribution

Spreads in Burkina Faso, Cote d'Ivoire, Kenya, Liberia, Mali, Niger, Nigeria, Sierra Leone, and Tanzania (and, possibly, Zanzibar).

Experimental host range

Few (<3) families susceptible.

Diagnostically susceptible host species and symptoms

• Oryza sativa - chlorotic dotting of leaf bases, elongating parallel to veins to produce mottling, stunting.
• Oryza barthii - yellow spots and vein streaking.
• Oryza punctata - systemic chlorotic dots.

  Dinebra retroflexa - mild systemic mottling.

• Phleum arenarium - systemic mottling and leaf death.

Maintenance and propagation hosts

Oryza sativa cv. Sindano.

Assay hosts (Local lesions or Whole plants)

Oryza sativa cvs Sindano and IR 20 (W).

Susceptible host species

• Dinebra retroflexa
• Oryza barthii
• Oryza longistaminata
• Oryza punctata
• Oryza sativa
• Phleum arenarium

Families containing susceptible hosts

• Gramineae (6/6)

Sources of host-range data

Bakker (1970, 1974).

Physical and biochemical properties

Properties of particles in sap

TIP: 65-70 °C (in sap from infected rice). LIV: 99 days (at 20ºC), or 260 days (at 4ºC). DEP: log₁₀ minus 6-9. Infectivity of sap not changed by treatment with di-ethyl ether. Leaf sap contains many virions.

Purification method

Bakker (1975); Fauquet and Thouvenel (1977).

Particle morphology

Virions isometric; not enveloped; 25 nm in diameter; angular in profile; with a conspicuous capsomere arrangement.

Physical properties

One sedimenting component in purified preparations; sedimentation coefficient 116 S. Density 1.359 g cm^-3 in CsCl. Isoelectric point pH 6. A₂₆₀/A₂₈₀ ratio 1.46-1.54.

Biochemical properties

Virions contain 23 % nucleic acid; 77 % protein; 0 % lipid.

Genome consists of RNA; single-stranded. Total genome size 4.2 kb. Genome unipartite; largest (or only) genome part 4.2 kb. Base composition 29 % G; 21 % A; 25 % C; 25 % U.

NCBI sequence data (Entrez search)

Sequence database accession code(s)

• L20893 Em(40)_vi:RYVCGEN Gb(84)_vi:RYVCGEN Rice yellow mottle virus complete genome. 2/94 4,450bp.
• U23142 Em(43)_vi:Ry23142 Gb(89)_vi:Ryu23142 Rice yellow mottle virus from Nigeria, complete genome. 4/95 4,451bp.

Cytopathology

Virions found in mesophyll and epidermis; in cytoplasm. Inclusions absent from infected cells.

Taxonomy and relationships

Sobemovirus

Virus(es) with serologically unrelated virions

Cocksfoot mottle and cocksfoot mild mosaic (syn. phleum mottle) viruses.

Comments and References

References

• Bakker, W. (1970). Neth. J. Pl. Path 76: 53.
• Bakker, W. (1971). Neth J. Pl. Path. 77: 201.
• Bakker, W. (1974). Agric. Res. Reports 829: 152 pp.
• Bakker, W. (1975). CMI/AAB Descr. Pl. Viruses No. 149, 4pp.
• Fauquet, C. and Thouvenel, J.C. (1977). Pl. Dis. Reptr 61: 443.
• John, V.T., Thottappilly, G. and Awoderu, V.A. (1984). FAO Pl. Prot. Bull. 32: 86.
• Rossel, H.W., Thottappilly, G. and Buddenhagen, I.W. (1982). FAO Pl. Prot. Bull. 30: 137.

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.