Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Iris fulva mosaic potyvirus

Index

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

Data collated by O.W. Barnett, 1991.

Nomenclature

Acronym

IFMV

ICTV decimal code

57.0.1.0.032

Host range and symptoms

Natural host range and symptoms

Symptoms persist. Symptoms faint mosaic.
• Iris fulva and hybrids with Iris fulva - faint mosaic.

Transmission

Transmitted by a vector; an insect; Myzus persicae, Macrosiphum euphorbiae, Aphis fabae; Aphididae. Not transmitted by Aphis craccivora. Transmitted in a non-persistent manner. Virus transmitted by mechanical inoculation; not transmitted by seed.

Geographical distribution

Spreads in the USA.

Experimental host range

Few (<3) families susceptible. Experimentally infected plants mostly show mosaic, necrosis, malformation of leaves and seed pods.

Diagnostically susceptible host species and symptoms

• Iris fulva and hybrids, Amaranthus caudatus, Belamcanda chinensis, Chenopodium quinoa, Iris sibirica.

Diagnostically insusceptible host species

Gladiolus sp. hybrids, Iris spuria, Neomarica gracilis, Nicotiana clevelandii, Tetragonia tetragonioides.

Maintenance and propagation hosts

Belamcanda chinensis (W).

Susceptible host species

• Amaranthus caudatus
• Belamcanda chinensis
• Chenopodium quinoa
• Iris fulva
• Iris fulva × I. brevicaulis
• Iris sibirica

Insusceptible host species

• Gladiolus
• Gomphrena globosa
• Iris spuria
• Neomarica gracilis
• Nicotiana clevelandii
• Nicotiana tabacum
• Phaseolus vulgaris
• Pisum sativum
• Tetragonia tetragonioides
• Vigna unguiculata

Families containing susceptible hosts

• Amaranthaceae (1/2)
• Chenopodiaceae (1/1)
• Iridaceae (4/7)

Families containing insusceptible hosts

• Amaranthaceae (1/2)
• Iridaceae (3/7)
• Leguminosae-Papilionoideae (3/3)
• Solanaceae (2/2)
• Tetragoniaceae (1/1)

Sources of host-range data

Barnett (1986); Barnett and Alper (1977).

Physical and biochemical properties

Properties of particles in sap

TIP: 50 °C. LIV: 2 days. DEP: log₁₀ minus 4. Leaf sap contains few virions.

Purification method

Barnett (1986).

Particle morphology

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

Physical properties

One sedimenting component in purified preparations; sedimentation coefficient 141 S. A₂₆₀/A₂₈₀ ratio 1.19.

Biochemical properties

Virions contain 6 % nucleic acid; 94 % protein.

Genome consists of RNA; single-stranded; linear. Total genome size 9.4 kb. Genome unipartite; largest (or only) genome part 9.4 kb. Genomic nucleic acid isolated by Reddick and Barnett (1983). Additional factor not required for infectivity.

Features of the genome

Non-genomic nucleic acid not found in the virions.

Features of proteins

Virion protein(s) one; M_r 32000. Method of preparation: Barnett: heat in phosphate, mercaptoethanol, SDS and electrophoresis on SDS gels.

Replication

Replication does not depend on a helper virus.

Cytopathology

Virions found in leaves; in cytoplasm and in unusual sites; aggregate mitochondria. Inclusions present in infected cells; are pinwheels; they do not contain virions. Other cellular changes: mitochondrial aggregates.

Taxonomy and relationships

Potyvirus: Potyviridae

Virus(es) with serologically related virions

Iris virus 1 (Lisa, 1980).

Virus(es) with serologically unrelated virions

Iris severe mosaic and iris mild mosaic viruses.

Best tests for diagnosis

Serology in EM (decoration). Pinwheel inclusion morphology easily separates it from iris severe mosaic virus.

Comments and References

References

• Barnett, O.W. (1986). AAB Descr. Pl. Viruses No. 310, 4 pp.
• Barnett, O.W. and Alper, M. (1977). Phytopathology 67: 448.
• Lisa, V. (1980). Acta Hort. 110: 39.
• Reddick, B.B. and Barnett, O.W. (1983). Phytopathology 73: 1506.
• Travis, R.V. (1957). Phytopathology 47: 454.

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.