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Host range and some properties of iris severe mosaic virus in japan



Host range and some properties of iris severe mosaic virus in japan



Annals of the Phytopathological Society of Japan 47(2): 182-188



Pronounced mosaic symptoms are commonly observed in many cultivars of bulbous iris in Japan. The virus was transmitted readily by aphids (Aphis gossypii and Myzus persicae) in a non-persistent manner. It was also transmitted by sap-inoculation to 6 of 44 plant species in 13 families. Bulbous iris (Dutch iris) was infected systemically and exhibited pronounced mosaic symptoms. Local lesions were produced on Chenopodium amaranticolor, C. quinoa, Tetragonia expansa, Gomphrena globosa and Nicotiana clevelandii, but G. globosa was infected with difficulty while N. clevelandii was infected without visible symptoms. The presence of the virus in these plants was confirmed by immuno-EM with antiserum against iris severe mosaic virus (ISMV). Sap from the diseased T. expansa was infective after 10 min at 60.degree. C but not 65.degree. C, after dilution to 10-3 but not 10-4 and after 3-4 days at 20.degree. C. The virus particles were filamentous, .apprx. 750 .times. 13 nm. In ultrathin sections of diseased plant leaf tissue, pinwheel and laminated aggregate inclusions were observed in the cytoplasm. The inclusions found in negatively stained dip-preparations exhibited fine striations with a periodicity of 5.3 nm. In immuno-EM, the virus particles reacted with ISMV antiserum but not with iris mild mosaic virus antiserum. The virus did not react with antisera against turnip mosaic virus, potato virus Y and bean yellow mosaic virus in the micro-precipitin test. The virus was identified as iris severe mosaic virus.

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