Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Radish yellow edge alphacryptovirus

Index

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

Data collated by T. Natsuaki, 1987.

Nomenclature

Acronym

RYEV

ICTV decimal code

49.0.3.0.012

Host range and symptoms

Natural host range and symptoms

Symptoms disappear soon after infection.
• Raphanus sativus - usually no symptoms, but rarely with yellowed leaf margins.

Transmission

Virus not transmitted by mechanical inoculation; not transmitted by grafting; not transmitted by contact between plants; transmitted by seed; transmitted by pollen to the seed.

Ecology and control

Studies reported by Natsuaki et al. (1979, 1983).

Geographical distribution

Found, but with no evidence of spread, in Australia, China, Italy, the U.K. and the U.S.A.

Experimental host range

Few (<3) families susceptible.

Diagnostically insusceptible host species

Chenopodium amaranticolor, Nicotiana tabacum, Cucumis sativus, Vigna unguiculata ssp. sesquipedalis and Brassica campestris ssp. rapa.

Maintenance and propagation hosts

Raphanus sativus.

Susceptible host species

• Raphanus sativus

Insusceptible host species

• Brassica campestris ssp. rapa
• Chenopodium amaranticolor
• Cucumis sativus
• Nicotiana tabacum
• Vigna unguiculata ssp. sesquipedalis

Families containing susceptible hosts

• Cruciferae (1/2)

Families containing insusceptible hosts

• Chenopodiaceae (1/1)
• Cruciferae (1/2)
• Cucurbitaceae (1/1)
• Leguminosae-Papilionoideae (1/1)
• Solanaceae (1/1)

Sources of host-range data

Natsuaki et al. (1979); Natsuaki (1985).

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions.

Purification method

Natsuaki (1983).

Particle morphology

Virions isometric; not enveloped; 30 nm in diameter; rounded in profile; without a conspicuous capsomere arrangement.

Physical properties

One sedimenting component in purified preparations; sedimentation coefficient 118 S. Density 1.37 g cm^-3 in CsCl.

Biochemical properties

Genome consists of RNA; double-stranded; linear. Total genome size 3.76 kb. Genome of three parts; largest (or only) genome part the largest 1.3 kb; the 2nd largest 1.25 kb; the 3rd largest 1.21 kb. Genomic nucleic acid isolated by Natsuaki et al. (1983).

Features of proteins

Virion protein(s) two; M_r of the larger 63000. M_r of 2nd largest 61000. Method of preparation: Natsuaki et al. (1983).

Cytopathology

Virions found in all parts of the host plant; in cytoplasm. Inclusions present in infected cells; are viroplasms (but are rarely observed); they contain virions.

Taxonomy and relationships

Alphacryptovirus: Partitiviridae

Virus(es) with serologically unrelated virions

All other alphacryptovirus species tested.

Best tests for diagnosis

This virus is readily distinguished from other viruses infecting crucifers by its possession of dsRNA. ISEM and extracting dsRNA directly from leaves are used for diagnosis.

Comments and References

References

• Natsuaki, T., Yamashita, S., Doi, Y. and Yora, K. (1979). Ann. Phytopath. Soc. Japan 45: 313.
• Natsuaki, T., Okuda, S., Teranaka, M., Yamashita, S. and Doi, Y. (1983). Ann. Phytopath. Soc. Japan 49: 593.

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.