Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Rymoviruses: Potyviridae

Index

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

Nomenclature

ICTV reference

ICTV decimal code 57.0.2.

Definitive species

• Agropyron mosaic rymovirus
• Hordeum mosaic rymovirus
• Oat necrotic mottle rymovirus
• Ryegrass mosaic rymovirus
• Wheat streak mosaic rymovirus

Tentative species

• Brome streak mosaic (?) rymovirus
• Spartina mottle (?) rymovirus

Host range and symptoms

Natural host range and symptoms

Symptoms persist (5/5), or vary seasonally (1/5).

Transmission

Transmitted by a vector (3/4), or means not involving a vector (1/4); a mite (3/3); Eriophyidae (3/3). Virus not transmitted congenitally to the progeny of the vector (1/1); transmitted by mechanical inoculation (6/6); not transmitted by contact between plants (2/2); transmitted by seed (1/4), or not transmitted by seed (3/4); not transmitted by pollen (3/3).

Experimental host range

Few (<3) families susceptible.

Susceptible host species

• Aegilops (1)
• Agropyron (1)
• Avena (1)
• Avena sativa (4)
• Bromus (2)
• Bromus mollis (2)
• Bromus secalinus (1)
• Chrysalidocarpus lutescens (1)
• Dactylis glomerata (1)
• Digitaria (1)
• Echinochloa (1)
• Echinochloa crus-galli (1)
• Elymus canadensis (1)
• Elymus trachycaulus (1)
• Elymus virginicus (1)
• Elytrigia intermedia (1)
• Elytrigia repens (1)
• Eragrostis (1)
• Festuca pratensis (1)
• Hordeum (2)
• Hordeum jubatum (1)
• Hordeum murinum (1)
• Hordeum vulgare (4)
• Lolium (1)
• Lolium multiflorum (3)
• Lolium multiflorum × L. perenne (1)
• Lolium perenne (1)
• Lophopyrum elongatum (1)
• Oryza sativa (1)
• Panicum (1)
• Phalaris (1)
• Poa (1)
• Poa canadensis (1)
• Poa compressa (1)
• Poa palustris (1)
• Poa pratensis (2)
• Secale cereale (3)
• Setaria (1)
• Setaria viridis (1)
• Spartina alternifolia (1)
• Spartina anglica (1)
• Spartina glabra (1)
• Spartina maritima (1)
• Spartina townsendii (1)
• Stipa (1)
• Triticum (1)
• Triticum aestivum (5)
• Triticum durum (2)
• Vulpia (1)
• Zea mays (1)

Insusceptible host species

• Agrostis alba (1/6)
• Agrostis palustris (1/6)
• Agrostis tenuis (1/6)
• Avena sativa (3/6)
• Beta vulgaris (1/6)
• Bromus inermis (3/6)
• Chenopodium amaranticolor (1/6)
• Chloris gayana (1/6)
• Cucumis sativus (1/6)
• Cynodon dactylon (1/6)
• Dactylis glomerata (4/6)
• Echinochloa crus-galli (1/6)
• Elytrigia intermedia (2/6)
• Elytrigia repens (4/6)
• Festuca elatior (1/6)
• Festuca rubra (1/6)
• Hordeum jubatum (2/6)
• Hordeum vulgare (2/6)
• Lolium multiflorum (1/6)
• Lolium perenne (3/6)
• Lophopyrum elongatum (2/6)
• Nicotiana clevelandii (1/6)
• Nicotiana glutinosa (1/6)
• Nicotiana tabacum (1/6)
• Oryza sativa (1/6)
• Petunia × hybrida (1/6)
• Phaseolus vulgaris (1/6)
• Phleum pratense (1/6)
• Saccharum officinarum (1/6)
• Secale cereale (1/6)
• Setaria italica (1/6)
• Sorghum bicolor (1/6)
• Triticum aestivum (2/6)
• Zea mays (2/6)

Families containing susceptible hosts

• Gramineae
• Palmae (1)

Families containing insusceptible hosts

• Chenopodiaceae (1/6)
• Cucurbitaceae (1/6)
• Gramineae (6/6)
• Leguminosae-Papilionoideae (1/6)
• Solanaceae (1/6)

Physical and biochemical properties

Properties of particles in sap

TIP: 50-52.8-60 °C. LIV: 1-8.75-56 days. DEP: log₁₀ minus 3 (6/6), or 4 (1/6). Leaf sap contains few virions (2/4), or contains many virions (2/4).

Particle morphology

Virions filamentous; not enveloped (4/4); usually flexuous (6/6); with a clear modal length; of 693-709.8-760 nm; 11-13.7-15.5 nm wide. Axial canal obscure (4/4). Basic helix obscure (3/3).

Physical properties

One sedimenting component in purified preparations (5/5); sedimentation coefficient 150-161.5-166 S. Density 1.304-1.314-1.325 g cm^-3 in CsCl. A₂₆₀/A₂₈₀ ratio 1.33-1.35-1.37.

Biochemical properties

Virions contain 5.3 % nucleic acid; 0 % lipid.

Genome consists of RNA (5/5); single-stranded (5/5); linear (2/2). Total genome size 8-9-10 kb. Genome unipartite (4/4); largest (or only) genome part 8-9-10 kb. Base composition 31 % G; 23 % A; 24 % C; 22 % U. 5´ terminus of RNA has a VPg (2/2). Infectivity retained when deproteinised with phenol or detergent (1/1). Poly A region present (1/1). Genome has no tRNA-like activity (1/1).

NCBI sequence data (Entrez search)

Features of the genome

Non-genomic nucleic acid not found in the virions (1/1). Sub-genomic mRNA not found in infected cells (2/2).

Features of proteins

Virion protein(s) one (5/5); M_r 29200-38660-47000.

Virus-coded non-virion proteins isolated (2/2); one protein found (2/2). M_r 68000-70000-72000.

Replication

Genome replicates in cytoplasm (2/2). Replication does not depend on a helper virus (3/3).

Cytopathology

Virions found in cytoplasm (6/6). Inclusions present in infected cells; are pinwheels, or unusual in shape (1); they do not contain virions (4/4).

Taxonomy and relationships

Viral family : Potyviridae.

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.