Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Iris mild mosaic potyvirus

Index

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

Data collated by C.J. Asjes, 1986.

Nomenclature

Synonyms

iris mosaic virus, iris latent mosaic virus.

Acronym

IMMV

ICTV decimal code

57.0.1.0.033

Host range and symptoms

Natural host range and symptoms

Symptoms vary cyclically over a few weeks.
• Iris spp.; bulbous irises, Iris xiphoides (English iris), I. xiphium (Spanish iris), I. tingitana × I. xiphium (Dutch iris), I. reticulata and I. danfordiae - mild mosaic.

Transmission

Transmitted by a vector; an insect; Aphis gossypii, Macrosiphum euphorbiae and Myzus persicae, but not by Macrosiphoniella sanborni; Aphididae. Transmitted in a non-persistent manner. Virus not transmitted by seed.

Geographical distribution

Probably distributed worldwide (most important cultivars are totally infected (Van Slogteren, 1963; Loebenstein and Alper, 1963; Lawson, 1967; Asjes, 1979)).

Experimental host range

Several (3-9) families susceptible.

Diagnostically susceptible host species and symptoms

• Iris spp. - green mosaic of leaves, more intense on spathes (Van Slogteren, 1963; Loebenstein and Alper, 1963; Lawson, 1967; Asjes, 1979).
• Chenopodium quinoa - chlorotic local lesions, not systemic.
• Nicotiana clevelandii - chlorotic lesions.
• Tetragonia tetragonioides - circular chlorotic local lesions with dark grey necrotic margins, not systemic.
• Belamcanda chinensis - (Hammond, unpublished data).

Maintenance and propagation hosts

Iris spp.

Assay hosts (Local lesions or Whole plants)

Tetragonia tetragonioides (L); Chenopodium quinoa (L).

Susceptible host species

• Belamcanda chinensis
• Chenopodium amaranticolor
• Chenopodium quinoa
• Iris
• Iris danfordiae
• Iris reticulata
• Iris tingitana × I. xiphium
• Iris xiphium
• Iris xiphoides
• Nicotiana clevelandii
• Nicotiana megalosiphon
• Tetragonia tetragonioides

Families containing susceptible hosts

• Chenopodiaceae (2/2)
• Iridaceae (7/7)
• Solanaceae (2/2)
• Tetragoniaceae (1/1)

Sources of host-range data

Asjes (1979).

Physical and biochemical properties

Properties of particles in sap

TIP: probably 65-70 °C. LIV: 3-4 days (at 20ºC and 16-32 days at 2ºC. Sap lyophilized with dextrose and peptone remains infective for at least 2 years (Brunt, 1968)). DEP: log₁₀ minus 3-4. Leaf sap contains many virions.

Purification method

Asjes (1979); Brunt (1973).

Particle morphology

Virions filamentous; usually flexuous; with a clear modal length; of 750 nm; 12 nm wide. Axial canal obvious (when stained with UF).

Physical properties

One sedimenting component in purified preparations; sedimentation coefficient 142-147 S (but the virions may form faster sedimenting aggregates).

Biochemical properties

Virions contain 5-6 % nucleic acid; 95 % protein; 0 % lipid.

Cytopathology

Virions found in all parts of the host plant; in cytoplasm. Inclusions present in infected cells; are unusual in shape; primarily pinwheels with laminated aggregates and the lamellae close to virions.

Taxonomy and relationships

Potyvirus: Potyviridae

Virus(es) with serologically related virions

Bean yellow mosaic virus.

Virus(es) with serologically unrelated virions

Iris severe mosaic (Van Slogteren, 1963; Lawson, 1967), bearded iris mosaic (Barnett et al., 1971) and potato Y viruses.

Comments and References

References

• Asjes, C.J. (1979). Neth. J. Pl. Path. 85: 269.
• Barnett, O.W., de Zoeten, G.A. and Gaard, G. (1971). Phytopathology 61: 926.
• Brunt, A.A. (1968). Ann. appl. Biol. 61: 187.
• Brunt, A.A. (1973). CMI/AAB Descr. Pl. Viruses No. 116, 4 pp.
• Brunt, A.A. (1986). CMI/AAB Descr. Pl. Viruses No. 324, 5 pp.
• Derks, A.F.L.M., Hollinger, T.C. and Vink-van den Abeele, J.L. (1985). Acta. Hort. 164: 309.
• Hammond, J., Brunt, A.A., Derks, A.F.L.M., Inouye, N., Barnett, O.W., Allen, T.C. and Lawson, R.H. (1985). Acta Hort. 164: 395.
• Lawson, R.H. (1967). Pl. Dis. Reptr 51: 952.
• Loebenstein, G. and Alper, M. (1963). Phytopathology 53: 349.
• Van Slogteren, D.H.M. (1958). Versl. Werkzaamh. Bloemboll. Lisse, 1957.
• Van Slogteren, D.H.M. (1963). Versl. Werkzaamh. Bloemboll. Lisse, 1962.

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.