Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Yam internal brown spot (?) badnavirus

Index

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

Data collated by A.A. Brunt and I.M. Roberts, 1987.

Nomenclature

Synonyms

dioscorea badnavirus.

ICTV decimal code

07.0.1.T.DE.3

Host range and symptoms

Natural host range and symptoms

Symptoms persist.
• Dioscorea alata cv. White Lisbon - probably causes internal brown spot of tubers, either alone or together with an uncharacterised potyvirus.

Transmission

Virus not transmitted by mechanical inoculation.

Diagnostically susceptible host species and symptoms

• Dioscorea alata - internal brown spots in tubers.

Susceptible host species

• Dioscorea alata

Families containing susceptible hosts

• Dioscoreaceae (1/1)

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions. Electron microscopy: virions often bind to cell debris.

Particle morphology

Virions bacilliform; not enveloped; 130 nm in length; 29 nm wide.

Cytopathology

Virions found in clusters in phloem parenchyma; in cytoplasm (close to the nuclei). Inclusions may be present in infected cells (as clusters of virions bound together with amorphous material).

Taxonomy and relationships

Possible Badnavirus

Comments and References

References

• Coursey, D.G. (1967). J. Agric. Soc. Trinidad 67: 473.
• Harrison, B.D. and Roberts, I.M. (1973). Trop. Agric., Trin. 50: 335.
• Jeffers, W. de C. and Headley, W. (1967). Minist. Agric. Barbados Bull. 46: 7.

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.