Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Betacryptoviruses: Partitiviridae

Index

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

Nomenclature

ICTV reference

ICTV decimal code 49.0.4.

Definitive species

• Carrot temperate 2 betacryptovirus
• Hop trefoil 2 betacryptovirus
• Red clover 2 betacryptovirus
• White clover 2 betacryptovirus

Tentative species

• Alfalfa 2 (?) betacryptovirus

Transmission

Transmitted by means not involving a vector (1/1). Virus not transmitted by mechanical inoculation; not transmitted by grafting; not transmitted by contact between plants (1/1); transmitted by seed.

Experimental host range

Few (<3) families susceptible (2/2).

Susceptible host species

• Daucus carota (1)
• Medicago lupulina (1)
• Medicago sativa (1)
• Trifolium pratense (1)
• Trifolium repens (1)

Families containing susceptible hosts

• Leguminosae-Papilionoideae (4)
• Umbelliferae (1)

Host range and symptoms

No data available.

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions (1/1).

Particle morphology

Virions isometric; not enveloped (2/2); 30-36.4-38 nm in diameter; rounded in profile (2/3), or angular in profile (1/3); with a conspicuous capsomere arrangement (2/2).

Physical properties

One sedimenting component in purified preparations (1/1). Density 1.375 g cm^-3 in CsCl. A₂₆₀/A₂₈₀ ratio 1.31.

Biochemical properties

Virions contain 24 % nucleic acid; 76 % protein.

Genome consists of RNA (4/4); double-stranded (4/4); linear (2/2). Total genome size 4.31-4.803-5.15 kb. Genome of two parts (2/3), or of three parts (1/3); largest (or only) genome part 2.05-2.279-2.55 kb; the 2nd largest 1.65-2.04-2.4 kb; the 3rd largest 1.45 kb.

NCBI sequence data (Entrez search)

Cytopathology

Virions found in cytoplasm (1/1). Inclusions absent from infected cells (1/1).

Taxonomy and relationships

Viral family : Partitiviridae.

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.