Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Cocksfoot mild
mosaic (?) sobemovirus
Index
Data collated by W. Huth, 1991.
Nomenclature
Acronym
Strains
brome stem leaf
mottle virus (Catherall and Chamberlain, 1975 and 1977; Paul et al.,
1980), cocksfoot necrosis and mosaic virus (Hariri and Lapierre, 1977), festuca
mottle virus (Catherall and Chamberlain, 1977; Gibson and Boyes, 1974; Paul
et al., 1980), holcus transitory mottle virus (Catherall and Chamberlain,
1975; Paul et al., 1980), phleum mottle virus (Catherall, 1966; Catherall
and Chamberlain, 1975; Paul et al., 1973/74; Paul et al., 1980).
ICTV decimal code
Host range and symptoms
First reported
in Phleum pratense, Dactylis glomerata; from the U.K. and Germany; by
Carr (1966); Huth (1968).
Natural host range and symptoms
Symptoms persist and vary
seasonally. Symptoms light green streaks.
- Agrostis stolonifera, Bromus mollis, Dactylis glomerata, Festuca
pratensis, Holcus lanatus, Phleum pratense, Poa trivialis - faint leaf
chlorosis.
Transmission
Transmitted by a vector; an insect;
Aphididae and Coleoptera (inefficiently, and probably non-specifically). Virus
transmitted by mechanical inoculation; not transmitted by contact between
plants; not transmitted by seed; not transmitted by pollen.
Geographical distribution
Spreads in Canada, the former
Czechoslovakia, Denmark, France, Germany, Norway, and the UK.
Experimental host range
Few (<3) families susceptible.
Experimentally infected plants mostly show light green streaks.
Diagnostically susceptible host species and symptoms
- Hordeum vulgare - light green streaks.
- Avena sativa,
Dactylis glomerata, Festuca pratensis, Secale cereale, Setaria italica -
diffuse systemic mild mosaics.
Diagnostically insusceptible host
species
Elytrigia repens, Anthoxanthum odoratum, Lolium
perenne.
Maintenance and propagation hosts
Assay hosts (Local lesions or Whole plants)
Dactylis glomerata, Festuca
pratensis, Hordeum vulgare, Secale cereale, Setaria italica.
Susceptible host species
Insusceptible
host species
Families containing susceptible hosts
Families containing
insusceptible hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
80-85 °C. LIV: 3 days. DEP: log10 minus 5. Leaf sap contains many virions.
Purification method
Particle morphology
Virions isometric; 28 nm in diameter;
angular in profile.
Physical properties
One sedimenting component in purified
preparations; sedimentation coefficient 105 S (»1). A260/A280
ratio 1.65 (»0.02).
Biochemical properties
Virions contain 23.5 % nucleic
acid; 76.5 % protein.
Genome consists of RNA; single-stranded; linear. Total genome size 5.7
kb. Genome unipartite (sometimes also a minor component of 1.5 kb); largest (or
only) genome part 5.7 kb. Base composition 26.6 % G; 23.4 % A; 28.4 % C; 21.6 %
U.
Features of proteins
Virion protein(s) one;
Mr 24900; coat protein.
Cytopathology
Inclusions absent from infected cells.
Taxonomy and
relationships
Additional comments on relationships
The virus is distantly serologically related to molinia streak virus
(Querfurth and Bercks, 1976), which is now considered to be a strain of panicum
mosaic sobemovirus (Paul et al., 1980). There have also been unconfirmed
and disputed reports of serological cross-reactions with virions of tobacco
mosaic virus and some viruses of the turnip yellow mosaic virus group.
Best tests for diagnosis
Cocksfoot
mottle and cocksfoot streak viruses are often found in mixed infections in
Dactylis glomerata and the quickest diagnostic method is by serological
testing.
Comments and
References
References
- A'Brook, J. and Benigno,
D.A. (1972). Ann. appl. Biol. 72: 169.
- Benigno, D.A. (1972).
Ann. appl. Biol. 72: 43.
- Benigno, D.A. and A.'Brook, J.
(1972). Pl. Path. 21: 142.
- Bercks, R. and Querfurth, G.
(1971). Phytopath. Z. 72: 354.
- Bercks, R. and Querfurth, G.
(1972). Phytopath. Z. 75: 215.
- Carr, A.J.H. (1966). Rep.
Welsh Pl. Breed. Stn 1965, p. 90.
- Carr, A.J.H. (1967). Rep. Welsh Pl.
Breed. Stn 1966, p. 110.
- Catherall, P.L. (1966). Rep. Welsh Pl.
Breeding Stn. 1965, p. 94.
- Catherall, P.L. (1982). Rep. Welsh Pl.
Breed. Stn. 1981, p. 161.
- Catherall, P.L. and Chamberlain, J.A. (1975).
Pl. Path. 24: 217.
- Catherall, P.L. and Chamberlain, J.A.
(1977). Ann. appl. Biol. 87: 147.
- Chamberlain, J.A. and
Catherall, P.L. (1976). J. gen. Virol. 30: 41.
- Chamberlain,
J.A. and Catherall, P.L. (1976). Ann. appl. Biol. 83: 475.
- Gibson, R.W. and Boyes, D. (1974). Rep. Rothamsted Exp. Stn. 1973, p.
137.
- Hariri, D. and Lapierre, H. (1977). Annls. Phytopath. 9:
281.
- Hariri, D. and Lapierre, H. (1979). Annls. Phytopath. 11:
246.
- Hull, R. (1977). J. gen. Virol. 36: 289.
- Huth, W.
(1968). Phytopath. Z. 62: 300.
- Huth, W. and Paul, H.L. (1972).
CMI/AAB Descr. Pl. Viruses No. 107, 4 pp.
- Huth, W., Brandes, J. and
Paul, H.L. (1970). Phytopath. Z. 68: 367.
- Paul, H.L. (1974).
Acta Biol. Jugosl. Ser. B. Microb. 11: 193.
- Paul, H.L. and
Huth, W. (1970). Phytopath. Z. 69: 1.
- Paul, H.L., Huth, W. and
Querfurth, G. (1973/74). Intervirology 2: 253.
- Paul, H.L.,
Querfurth, G. and Huth, W. (1980). J. gen. Virol. 47: 67.
- Querfurth, G. and Bercks, R. (1976). Phytopath. Z. 85: 193.
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: 20th August 1996.' URL
http://biology.anu.edu.au/Groups/MES/vide/
Dallwitz (1980)
and
Dallwitz, Paine and Zurcher (1993)
should also be cited.
Please send comments, corrections and suggestions to:
vide-manager@biology.anu.edu.au