Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Cassava common mosaic (?) potexvirus

Index

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

Data collated by E.W. Kitajima, 1985. Revised by F.W. Zettler, 1989.

Nomenclature

Synonyms

Brazilian cassava common mosaic virus.

Acronym

CsCMV

Strains

chaya strain.

ICTV decimal code

56.0.1.T.005

Host range and symptoms

Natural host range and symptoms

Symptoms persist.
• Cnidoscolus acontifolius, Manihot esculenta - mosaic.

Transmission

Transmitted by means not involving a vector; disseminated in infected cuttings. Virus transmitted by mechanical inoculation; transmitted by grafting; not transmitted by seed; not transmitted by pollen.

Geographical distribution

Spreads in Brazil, Colombia, Mexico, Peru, Taiwan, and the USA (Florida), Cote d'Ivoire (possibly).

Experimental host range

Several (3-9) families susceptible. Experimentally infected plants mostly show chlorotic or necrotic local lesions, not systemic.

Diagnostically susceptible host species and symptoms

• Gomphrena globosa, Chenopodium amaranticolor, C. murale, C. quinoa, Gossypium hirsutum, Manihot esculenta, Ricinus communis - local lesions; not systemic.
• Cassia occidentalis, Datura stramonium - chlorotic or necrotic local lesions; not systemic (Chaya strain).
• Nicotiana benthamiana - chlorotic local lesions; mild systemic chlorosis.

Diagnostically insusceptible host species

Nicotiana glutinosa, N. tabacum, Zea mays.

Maintenance and propagation hosts

Euphorbia heterophylla, Manihot esculenta.

Assay hosts (Local lesions or Whole plants)

Gomphrena globosa (L), Chenopodium amaranticolor (L), C. quinoa (L).

Susceptible host species

• Cassia occidentalis
• Chenopodium album
• Chenopodium amaranticolor
• Chenopodium murale
• Chenopodium quinoa
• Cnidoscolus acontifolius
• Datura stramonium
• Euphorbia heterophylla
• Gomphrena globosa
• Gossypium hirsutum
• Manihot esculenta
• Nicotiana benthamiana
• Ricinus communis

Insusceptible host species

• Chenopodium murale
• Chenopodium quinoa
• Chrysanthemum morifolium
• Cucurbita pepo
• Datura metel
• Datura stramonium
• Euphorbia marginata
• Glycine max
• Lycopersicon esculentum
• Nicandra physalodes
• Nicotiana clevelandii
• Nicotiana debneyi
• Nicotiana glutinosa
• Nicotiana rustica
• Nicotiana tabacum
• Nicotiana × edwardsonii
• Phaseolus vulgaris
• Physalis floridana
• Pisum sativum
• Vigna unguiculata
• Zea mays

Families containing susceptible hosts

• Amaranthaceae (1/1)
• Chenopodiaceae (4/4)
• Euphorbiaceae (4/5)
• Leguminosae-Caesalpinioideae (1/1)
• Malvaceae (1/1)
• Solanaceae (2/12)

Families containing insusceptible hosts

• Chenopodiaceae (2/4)
• Compositae (1/1)
• Cucurbitaceae (1/1)
• Euphorbiaceae (1/5)
• Gramineae (1/1)
• Leguminosae-Papilionoideae (4/4)
• Solanaceae (11/12)

Physical and biochemical properties

Properties of particles in sap

TIP: 65-70 °C. LIV: 128 days. DEP: log₁₀ minus 5-6. Infectivity of sap not changed by treatment with di-ethyl ether. Leaf sap contains few virions.

Purification method

Nolt et al. (1991).

Particle morphology

Virions filamentous; not enveloped; usually flexuous; with a clear modal length; of 495-525 nm; 15 nm wide. Axial canal obscure. Basic helix obscure.

Physical properties

One sedimenting component in purified preparations; sedimentation coefficient 126 S.

Biochemical properties

Virions contain 5 % nucleic acid.

Genome consists of RNA; single-stranded; linear (probably). Total genome size 6 kb. Genome unipartite; largest (or only) genome part 6 kb.

NCBI sequence data (Entrez search)

Sequence database accession code(s)

• U23414 Em(43)_vi:Cc23414 Gb(89)_vi:Ccu23414 Cassava common mosaic virus Brazilian strain, complete genome. 5/95 6,376bp.
• U23415 Em(43)_vi:Cc23415 Gb(89)_vi:Ccu23415 Cassava common mosaic virus Brazilian strain defective RNA, complete sequence. 5/95 1,094bp.

Features of proteins

Virion protein(s) one; M_r 21000.

Replication

Replication does not depend on a helper virus.

Cytopathology

Virions found in all parts of the host plant; in cytoplasm. Inclusions present in infected cells; are unusual in shape; fibrous masses; they contain virions.

Taxonomy and relationships

Possible Potexvirus

Virus(es) with serologically related virions

Potato X and tulip X potexviruses.

Virus(es) with serologically unrelated virions

Cactus X, cassava X, hydrangea ringspot, narcissus mosaic and nerine X potexviruses.

Differences between type strain and others

Chaya strain, unlike type strain, infects Chenopodium quinoa and induces nuclear inclusions.

Comments and References

References

• Costa, A.S. and Kitajima, E.W. (1972). CMI/AAB Descr. Pl. Viruses No. 90, 4 pp.
• Costa, A.S. and Normanha, E.S. (1940). J. Agron. (Piracicuba) 3: 239.
• Elliott, M.S. and Zettler, F.W. (1987). Plant Dis. 71: 353.
• Kitajima, E.W., Wetter, C., Oliveira, A.R., Silva, D.M. and Costa, A.S. (1965). Bragantia 24: 260.
• Nolt, B.L., Velasco, A.C. and Pineda, B. (1991). Ann. appl. Biol. 118: 105.
• Silva, D.M., Kitajima, E.W. and Oliveira, A.R. (1963). Cienc. Cult. 15: 304.
• Nolt, B.L., Velasco, A.C. and Pineda, B. (1991). Ann. appl. Biol. 105:.

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.