Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Shallot mite-borne latent (?) potexvirus

Index

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

Data collated by P. van Dijk, 1991.

Nomenclature

ICTV decimal code

56.0.1.T.D.09

Host range and symptoms

Natural host range and symptoms

Symptoms none.
• Allium cepa var. ascalonicum - symptomless infection or sometimes slight mottle.

Transmission

Transmitted by a vector; a mite; Aceria tulipae; Eriophyidae. Not transmitted by aphids; Acyrthosiphon pisum, Myzus (Sciamyzus) ascolonicus. Virus does not require a helper virus for vector transmission; transmitted by mechanical inoculation.

Ecology and control

Studies reported by Van Dijk et al. (1991): vegetative propagation, latent infection, omnipresence and abundance of the vector imply that the virus can be readily spread and is difficult to control.

Geographical distribution

Spreads in China, the Netherlands, Thailand, and the former USSR.

Experimental host range

Few (<3) families susceptible. Experimentally infected plants mostly show mostly symptomless or show chlorotic local lesions.

Diagnostically susceptible host species and symptoms

• Allium cepa, A. cepa var. ascalonicum, A. vineale - symptomless infection or slight mottle.

Diagnostically insusceptible host species

Allium porrum, A. sativum, A. fistulosum, Chenopodium murale.

Maintenance and propagation hosts

Allium cepa, A. cepa var. ascalonicum.

Assay hosts (Local lesions or Whole plants)

Allium cepa, A. cepa var. ascalonicum (W).

Susceptible host species

• Allium cepa
• Allium cepa var. ascalonicum
• Allium vineale

Insusceptible host species

• Allium fistulosum
• Allium porrum
• Allium sativum
• Celosia argentea
• Chenopodium amaranticolor
• Chenopodium murale
• Chenopodium quinoa
• Chlorophytum comosum
• Nicotiana benthamiana
• Nicotiana hesperis
• Nicotiana occidentalis
• Vicia faba

Families containing susceptible hosts

• Alliaceae (3/6)

Families containing insusceptible hosts

• Alliaceae (3/6)
• Amaranthaceae (1/1)
• Anthericaceae (1/1)
• Chenopodiaceae (3/3)
• Leguminosae-Papilionoideae (1/1)
• Solanaceae (3/3)

Sources of host-range data

Van Dijk et al. (1991).

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains many virions.

Particle morphology

Virions filamentous; not enveloped; usually flexuous; with a clear modal length; of 767 nm. Axial canal obscure.

Sequence database accession code(s)

• M97264 Em(40)_vi:SLVRNAGEN Gb(84)_vi:SLVRNAGENM Shallot virus X DNA sequence, open reading frames 1 ( RNA replicase) through 5 (coat protein) 1 sequence.

Replication

Replication does not depend on a helper virus.

Cytopathology

Virions found in all parts of the host plant. Inclusions present in infected cells; are unusual in shape.

Taxonomy and relationships

Possible Potexvirus

Virus(es) with serologically related virions

Onion mite-borne latent virus is distantly related to shallot mite-borne latent virus, but distantly. Shallot virus X is probably onion mite-borne latent virus, and/or shallot mite-borne latent virus (Van Dijk and van der Vlugt, 1994).

Virus(es) with serologically unrelated virions

No serological relationship with potyviruses, when tested in ISEM with polyclonal antibodies raised against whole potyvirus virions.

Best tests for diagnosis

No local lesions in Chenopodium spp., especially Chenopodium murale; virions in the electron microscope are clearly more flexuous than those of poty and carlaviruses; no decoration of virions with antisera to poty or carlaviruses (if raised to uncontaminated virus cultures).

Comments and References

General comments

The onion mosaic virus reported from the former U.S.S.R. (Cheremushkina, 1982; Razvjaskina, 1971), was probably a mixture of onion mite-borne latent, shallot mite-borne latent and onion yellow dwarf viruses (Van Dijk et al., 1991).

References

• Cheremushkina, N.P. (1982). Trudy po Selektsii i Semenovodstvu Ovoshchnyak Kultur 15: 74.
• Razvjazkina, G.M. (1971). Tag. Akad. Landw. D.D.R. 115: 69.
• Van Dijk, P. and van der Vlugt, R.A.A. (1994). Eur. J. Pl. Path. 100: 269.
• Van Dijk, P., Verbeek, M. and Bos, L. (1991). Neth. J. Pl. Path. 97: 381.

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.