Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Oryzaviruses: Reoviridae

Index

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

Nomenclature

ICTV reference

ICTV decimal code 60.0.9.

Definitive species

• Echinochloa ragged stunt oryzavirus
• Rice ragged stunt oryzavirus

Host range and symptoms

Natural host range and symptoms

Symptoms persist.

Transmission

Transmitted by a vector; an insect; Delphacidae. Transmitted in a persistent manner. Virus retained when the vector moults; multiplies in the vector; not transmitted congenitally to the progeny of the vector; does not require a helper virus for vector transmission (1/1); transmitted by mechanical inoculation (1), or not transmitted by mechanical inoculation (1); not transmitted by grafting (1/1); not transmitted by contact between plants; not transmitted by seed; not transmitted by pollen.

Experimental host range

Few (<3) families susceptible.

Susceptible host species

• Alopecurus aequalis (1)
• Echinochloa crus-galli (1)
• Echinochloa crus-galli var. formosensis (1)
• Echinochloa crus-galli var. oryzicola (1)
• Eleusine coracana (1)
• Hordeum vulgare (1)
• Imperata cylindrica (1)
• Imperata cylindrica var. major (1)
• Lolium multiflorum (1)
• Oryza latifolia (1)
• Oryza nivara (1)
• Oryza sativa
• Setaria italica (1)
• Triticum aestivum (1)
• Zea mays

Insusceptible host species

• Cynodon dactylon (1)
• Echinochloa colona (1)
• Eleusine indica (1)
• Hordeum vulgare (1)
• Leersia hexandra (1)
• Saccharum officinarum (1)
• Sorghum bicolor (1)
• Triticum aestivum (1)

Families containing susceptible hosts

• Gramineae

Families containing insusceptible hosts

• Gramineae

Physical and biochemical properties

Properties of particles in sap

TIP: 70-75-80 °C. LIV: 3 days. DEP: log₁₀ minus 6-7 (1/1). Leaf sap contains few virions, or contains many virions (1).

Particle morphology

Virions isometric; not enveloped; 65-72.5-80 nm in diameter; angular in profile; with a conspicuous capsomere arrangement (1), or without a conspicuous capsomere arrangement (1).

Physical properties

One sedimenting component in purified preparations (1), or two sedimenting components in purified preparations (1). A₂₆₀/A₂₈₀ ratio 1.8.

Biochemical properties

Genome consists of RNA; double-stranded; linear (1/1). Total genome size 26.64-26.65-26.66 kb. Genome of 10 parts; largest (or only) genome part 3.85-3.875-3.9 kb; the 2nd largest 3.82-3.86-3.9 kb; the 3rd largest 3.8 kb; the 4th largest 3.7-3.75-3.8 kb; the 5th largest 2.7-2.725-2.75 kb; the 6th largest and other parts 2.3-2.45-2.6 kb. Additional factor required for infectivity (1/1).

NCBI sequence data (Entrez search)

Features of the genome

Non-genomic nucleic acid not found in the virions (1/1).

Features of proteins

Virion protein(s) six (1), or 8 (1); M_r 124900-125900-126900. M_r of 2nd largest 97000-109900-122900. M_r of 3rd largest 66000-84500-102900. M_r of 4th largest 63000-63500-64000. M_r of 5th largest 48000-49000-50000. M_r of 6th largest and smaller, 34000-38500-43000.

Replication

Genome replicates in cytoplasmic viroplasms (1/1). Replication does not depend on a helper virus (1/1).

Cytopathology

Virions found in cytoplasm (1/1). Inclusions present in infected cells; are viroplasms; they contain virions.

Taxonomy and relationships

Viral family : Reoviridae.

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.