アスターの黄色輪紋症状株からのタバコ・ラットル・ウイルスの分離と Trichodorus minor Coldran による伝搬

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A yellow ringspot disease of aster was noticed in Saitama Prefecture for the first time in 1967. The symptoms were brilliant yellow rings, which were identical with those of aster ringspot disease described by Anderson (1954). From these asters, a virus was isolated by juice inoculation, and was identified to be tobacco rattle virus as designated by Corbett (1967). The virus in electronmicroscopy by dip method showed a bimodal length distribution of rigid rod-like particles. The shorter particles had a normal length of 70-80mμ; the longer particles a normal length of 170-180mμ. It was found that the host plants of the virus were aster, tobacco, cucumber, plantago, torenia, bean, cowpea, spinach, etc. The symptoms on these plants were similar to those described for tobacco rattle Virus by many workers. The virus was not transmitted by Myzus persicae, nor through seed, but soil-transmission was obvious. Thermal inactivation point in crude juice was 70-75°C (10min.), dilution end point 1 : 10^6, and longevity in vitro 91-98 days at 20°C. This aste isolate of tobacco rattle virus causes different symptoms on aster from those caused by HSN isolate of the same virus isolated from tobacco (Tomaru et al., 1967) : the former produces characteristic ringspot, while the latter top necrosis and veinal necrosis. Many nematodes belonging to genus Trichodorus were collected from soils around roots of the infected aster in fields with Seinhorst elutrator and sieving techniques. The species was identified to be Trichodorus minor Colbran, 1956 (≒ T. christiei Allen, 1957). Experimental transmission of the virus by T. minor was successfully made, although a comparatively low infection rate (20 out of 225 seedlings tested) was secured. Several plant species were grown in infected fields, and two months later virus isolation test from the plant roots were carried out. The virus was recovered from aster and spinach, but not from pea, cabbage, corn, etc. (Received June 9, 1969)
日本植物病理学会の論文
1970-01-30

アスターの黄色輪紋症状株からのタバコ・ラットル・ウイルスの分離と Trichodorus minor Coldran による伝搬

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