Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Yam mosaic potyvirus

Index

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

Data collated by J.C. Thouvenel, 1984; F. Nienhaus, 1987.

Nomenclature

Acronym

YMV

ICTV decimal code

57.0.1.0.075

Host range and symptoms

Natural host range and symptoms

Symptoms disappear soon after infection.
• Dioscorea alata, D. cayenensis, D. dumetorum, D. praehensilis, D. preussii, D. rotundata - mosaic, vein banding.

Transmission

Transmitted by a vector; an insect; Aphis craccivora, A. gossypii, Rhopalosiphum maidis, Toxoptera citricidus; Aphididae. Transmitted in a non-persistent manner. Virus transmitted by mechanical inoculation; not transmitted by contact between plants; not transmitted by seed (is by vegetative propagation).

Geographical distribution

Spreads in the African region (in the west); Guadeloupe and Guyana.

Experimental host range

Few (<3) families susceptible.

Diagnostically susceptible host species and symptoms

• Nicotiana benthamiana - faint systemic chlorosis and mosaic.
• Dioscorea cayenensis, D. praehensilis - systemic mosaic and vein banding.

Diagnostically insusceptible host species

Dioscorea composita, D. floribunda.

Maintenance and propagation hosts

Nicotiana benthamiana, Dioscorea cayenensis.

Assay hosts (Local lesions or Whole plants)

Nicotiana benthamiana (W), Dioscorea cayenensis (W).

Susceptible host species

• Dioscorea alata
• Dioscorea cayenensis
• Dioscorea dumetorum
• Dioscorea praehensilis
• Dioscorea preussii
• Dioscorea rotundata
• Nicotiana benthamiana

Insusceptible host species

• Dioscorea composita
• Dioscorea floribunda

Families containing susceptible hosts

• Dioscoreaceae (6/8)
• Solanaceae (1/1)

Families containing insusceptible hosts

• Dioscoreaceae (2/8)

Sources of host-range data

Thouvenel and Fauquet (1979).

Physical and biochemical properties

Properties of particles in sap

TIP: 55-60 °C. LIV: 0.5-1 days. DEP: log₁₀ minus 2-3. Infectivity of sap not changed by treatment with di-ethyl ether. Leaf sap contains few virions.

Purification method

Thouvenel and Fauquet (1979).

Particle morphology

Virions filamentous; not enveloped; usually flexuous; with a clear modal length; of 785 nm; 15 nm wide. Axial canal obscure. Basic helix obscure.

Physical properties

One sedimenting component in purified preparations. Isoelectric point pH 4.3.

Biochemical properties

Virions contain 6 % nucleic acid; 94 % protein; 0 % lipid.

Genome consists of RNA; single-stranded. Infectivity retained when deproteinised with phenol or detergent.

NCBI sequence data (Entrez search)

Sequence database accession code(s)

• Z48154 Em(44)n:Ymvcp3 Gb(90)_vi:Ymvcp3 Yam mosaic virus RNA for coat protein (N-terminus)(3). 6/95 456bp.
• Z48155 Em(44)n:Ymvcp4 Gb(90)_vi:Ymvcp4 Yam mosaic virus RNA for coat protein (N-terminus)(4). 6/95 456bp.
• Z48156 Em(44)n:Ymvcp5 Gb(90)_vi:Ymvcp5 Yam mosaic virus RNA for coat protein (N-terminus)(5). 6/95 420bp.
• Z48157 Em(44)n:Ymvcp6 Gb(90)_vi:Ymvcp6 Yam mosaic virus RNA for coat protein (N-terminus)(6). 6/95 420bp.
• Z48172 Em(44)n:Ymvcp1 Gb(90)_vi:Ymvcp1 Yam mosaic virus RNA for coat protein (N-terminus)(1). 6/95 456bp
• Z48173 Em(44)n:Ymvcp2 Gb(90)_vi:Ymvcp2 Yam mosaic virus RNA for coat protein (N-terminus)(2). 6/95 456bp.

Features of proteins

Virion protein(s) one; M_r 34000.

Cytopathology

Virions found in all parts of the host plant; in cytoplasm. Inclusions present in infected cells; are pinwheels; they do not contain virions.

Taxonomy and relationships

Potyvirus: Potyviridae

Virus(es) with serologically related virions

Groundnut eyespot, Guinea grass mosaic and pepper veinal mottle viruses, but distantly.

Comments and References

References

• Thouvenel, J.C. and Fauquet, C. (1977). C. r. Acad. Sci. Paris 284: 1947.
• Thouvenel, J.C. and Fauquet, C. (1979). Ann. appl. Biol. 93: 279.
• Thouvenel, J.-C. and Fauquet, C. (1986). AAB Descr. Pl. Viruses No. 314, 4 pp.

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.