Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Faba bean necrotic yellows nanavirus

Index

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

Data collated by K.M. Makkouk, 1994.

Nomenclature

ICTV decimal code

79.0.P.1.DE.1

Host range and symptoms

Natural host range and symptoms

Symptoms persist. Symptoms yellowing and stunting.
• Cicer arietinum, Lens culinaris - yellowing and stunting.
• Phaseolus vulgaris - stunting, yellowing and rosetting.
• Vicia faba - stunting, yellowing and leaf necrosis.

Transmission

Transmitted by a vector; an insect; Acyrthosiphon pisum, Aphis craccivora, Aphis fabae; Aphididae. Not transmitted by Myzus persicae. Transmitted in a persistent manner. Virus retained when the vector moults; not transmitted by mechanical inoculation; not transmitted by contact between plants; not transmitted by seed; not transmitted by pollen.

Geographical distribution

Spreads in Egypt, Ethiopia, Jordan, Lebanon, Morocco, Syria, and Turkey. Found, but with no evidence of spread, in Morocco.

Experimental host range

Few (<3) families susceptible. Experimentally infected plants mostly show stunting and yellowing, few pods, rolling of youngest leaves.

Diagnostically susceptible host species and symptoms

• Cicer arietinum, Lens culinaris, Phaseolus vulgaris, Pisum sativum, Vicia faba, V. sativa, V. palaestina - leaf yellowing and plant stunting.
• Medicago hispida, Trifolium incarnatum - leaf yellowing and reddening, plant stunting.

Diagnostically insusceptible host species

Beta vulgaris, Brassica campestris ssp. napus, Capsella bursa-pastoris, Cucumis sativus, Glycine max, Spinacia oleracea.

Maintenance and propagation hosts

Lens culinaris, Pisum sativum, Vicia faba.

Assay hosts (Local lesions or Whole plants)

Pisum sativum (W), Vicia sativa (W).

Susceptible host species

• Cicer arietinum
• Lathyrus odoratus
• Lens culinaris
• Medicago hispida
• Melilotus officinalis
• Phaseolus vulgaris
• Pisum sativum
• Trifolium incarnatum
• Trifolium subterraneum
• Vicia faba
• Vicia palaestina
• Vicia sativa

Insusceptible host species

• Antirrhinum majus
• Beta vulgaris
• Brassica campestris ssp. napus
• Capsella bursa-pastoris
• Crambe abyssinica
• Cucumis sativus
• Cucurbita pepo
• Glycine max
• Lycopersicon esculentum
• Medicago sativa
• Melilotus albus
• Ocimum basilicum
• Spinacia oleracea
• Trifolium hybridum
• Trifolium pratense
• Vicia villosa
• Vigna unguiculata

Families containing susceptible hosts

• Leguminosae-Papilionoideae (12/19)

Families containing insusceptible hosts

• Chenopodiaceae (2/2)
• Cruciferae (3/3)
• Cucurbitaceae (2/2)
• Labiatae (1/1)
• Leguminosae-Papilionoideae (7/19)
• Scrophulariaceae (1/1)
• Solanaceae (1/1)

Sources of host-range data

Katul et al., 1993.

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions. Electron microscopy: ISEM.

Purification method

Katul et al., 1993.

Particle morphology

Virions isometric; not enveloped; 18 nm in diameter; angular in profile; without a conspicuous capsomere arrangement.

Physical properties

One sedimenting component in purified preparations. A₂₆₀/A₂₈₀ ratio 1.4.

Biochemical properties

Genome consists of DNA; single-stranded; circular; of 7 parts; largest (or only) genome part each c. 0.97-1.25 kb. Genomic nucleic acid isolated by Katul et al., 1995. Poly A region present; in the gene that probably encodes the replicase. Nucleotide sequence references: Katul et al., 1993.

Features of proteins

Virion protein(s) one; M_r 22000; coat. Method of preparation: Katul et al., 1993.

Cytopathology

Virions found in leaves, roots and phloem.

Taxonomy and relationships

nanavirus

Best tests for diagnosis

Distinguished most quickly from bean leafroll luteovirus by the TBIA test.

Comments and References

References

• Franz, A., Makkouk, K.M. and Vetten, H.J. (1995). J. Phytopath. in press.
• Katul, L., Vetten, H.J., Maiss, E., Makkouk, K.M., Lesemann, D.E. and Caspar, R. (1993). Ann. appl. Biol. 123: 629.
• Katul, L., Maiss, E. and Vetten, H.J. (1995). J. gen. Virol. 76: 475.
• Makkouk, K.M., Kumari, S.G., Katul, L. and Caspar, R. (1991). Abstr. 4th Arab Cong. Pl. Prot., Cairo, Egypt. 1991, p.204.

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.