キュウリモザイクウイルスのタバコにかける根部感染と発病

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When the roots of young tobacco seedlings raised in soil or in culture solution were inoculated with extracted juice of tobacco leaves infected with cucumber mosaic virus ordinary strain (CMV-O), 25-100 percent of seedlings showed systemic symptoms within 7-40 days after inoculation, while with CMV yellow strain (CMV-Y) abou t5-20 percent of inoculated plants showed systemic symptoms. The rate of plants which showed systemic symptoms was lower than in the case of inoculation on leaves. The period required for the appearance of systemic symptoms was also longer. The difference in the rate of appearance of systemic symptoms between CMV-O and CMV-Y might be due partly to seasonal variation in susceptibility of tobacco roots and partly to the difference in the virus strains. Multiplication of CMV in the inoculated roots showed a similar pattern as in the roots of plants inoculated on leaves. Tobacco seedlings were raised in the pots (diameter 12 cm) with soil, two plants perpot, and the leaves of one of the plants were inoculated with CMV-0. The other plant was covered with p01yethylene bag to avoid infection by leaf contact. From more than 50 percent of root samples from uninoculated and appearently healthy tobacco plants, CMV was recovered within 31 days after inoculation on the donor host. In an experiment using tobacco plants grown in wooden-frame, and inoculated with CMV-Y, a similar result was obtained. In a test of field grown tobacco plants, growing in the vicinity of CMV infected plants, CMV was recovered from the roots of 5 plants out of 7 plants tested, even though the tested plants were showing no symptoms and no virus was detected from the leaves. The transmission of the virus may have been caused by root contact, because transmission occured more frequently in abundantly rooted plants than in poorly rooted ones, and no virus was detected from root-samples collected from root parts on the other side of neighbouring infected plant. Contact transmission has been thought to be negligible in the case of comparatively labile viruses such as CMV. From the results reported here, however, transmission by root contact may not be neglected in natural occurrences of CMV in tobaccoo Plants. (Received October 16, 1970)
日本植物病理学会の論文
1971-01-30

キュウリモザイクウイルスのタバコにかける根部感染と発病

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