Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Malva veinal necrosis (?) potexvirus

Index

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

Data collated by A.A. Brunt, 1990 and E.W. Kitajima, 1991.

Nomenclature

Synonyms

malva veinal chlorosis virus.

Acronym

MVNV

ICTV decimal code

56.0.1.T.010

Host range and symptoms

Natural host range and symptoms

Symptoms persist.
• Malva parviflora, other Malva spp. - veinal necrosis.

Transmission

Virus transmitted by mechanical inoculation.

Geographical distribution

Spreads in Brazil.

Experimental host range

Several (3-9) families susceptible. Experimentally infected plants mostly show systemic mosaics, mottles, ringspots or necrosis.

Diagnostically susceptible host species and symptoms

• Malva parviflora, M. rotundifolia - necrotic local lesions, then systemic veinal necrosis.
• Gomphrena globosa - necrotic local lesions.
• Chenopodium amaranticolor, C. quinoa - local lesions.
• Sesamum indicum, Tetragonia tetragonioides.

Maintenance and propagation hosts

Malva parviflora.

Assay hosts (Local lesions or Whole plants)

Malva parviflora (L,W), Chenopodium amaranticolor (L), Gomphrena globosa (L).

Susceptible host species

• Chenopodium amaranticolor
• Chenopodium quinoa
• Gomphrena globosa
• Malva parviflora
• Malva rotundifolia
• Sesamum indicum
• Tetragonia tetragonioides

Insusceptible host species

• Abelmoschus esculentus
• Datura stramonium
• Gossypium hirsutum
• Nicotiana glutinosa
• Nicotiana tabacum
• Physalis floridana
• Solanum tuberosum

Families containing susceptible hosts

• Amaranthaceae (1/1)
• Chenopodiaceae (2/2)
• Malvaceae (2/4)
• Pedaliaceae (1/1)
• Tetragoniaceae (1/1)

Families containing insusceptible hosts

• Malvaceae (2/4)
• Solanaceae (5/5)

Physical and biochemical properties

Properties of particles in sap

TIP: 70-75 °C. DEP: log₁₀ minus 6. Leaf sap contains few virions.

Particle morphology

Virions filamentous; usually flexuous; with a clear modal length; of 525 nm; 13 nm wide. Basic helix obscure.

Taxonomy and relationships

Possible Potexvirus

Comments and References

References

• Costa, A.S. and Kitajima, E.W. (1970). Bragantia 29: 51.

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.