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Studies on cucumber mosaic virus

1954; Phytopathological Society of Japan; Volume: 19; Issue: 1-2 Linguagem: Inglês

10.3186/jjphytopath.19.18

1882-0484

Yasuo Komuro, H. Asuyama,

Soybean genetics and cultivation

The symptoms of cucumber mosaic, which was noted in Tokyo in 1950, consisted mainly of mosaic and chlorotic spots on the leaves. Characteristic symptoms of yellow mottle or green warts on the fruits, as described by Doolittle and other investigators in U.S.A., were not observed. Greenhouse experiments showed that the virus was readily transferred by mechanical inoculation using earborundum, or by aphids, viz. Myzus persicae and Aphis gossypii or through dodder, Cuscuta japonica, but not transmitted by cucumber beetle, Aulacophora femoralis. Tests for seed transmission yielded negative results. The virus was capable of infecting hosts including 26 species of 11 families in 34 species of 13 families tested. On cucumber, muskmelon, zinnia, tobacco, tomato, spinach, corn, Commelina nudiflora, etc., systemic infection was obtained inducing the symptoms of mosaic, veinclearing, veinbanding and less frequently malformation of the leaves. Loca lnecrotic spots were developed on the inoculated leaves of watermelon, Cucumis Melo var. Conomon, cowpea (black seeded), broadbean, pea, sesame, Tetragonia expansa, Chenopodium album, etc. The virus was infectious after heating at 60° for 10 minutes. Tolerance to dilution varied according to tests from 1:1000 to 1:5000. Inactivation by aging in vitro was 2 to 4 days at room temperature. As a result of comparison of the symptoms, host range and physical properties, the virus under consideration is regarded to be identical with Cucumis virus 1 (Marmor cucumeris Holmes). The apparent mild symptoms of cucumber may be attributed to the tolerance of the Japanese varieties to the virus.