わが国でオーチャードグラスに発生しているコックスフットモットルウイルス

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タイトル別名
  • Cocksfoot Mottle Virus in Japan
  • ワガクニ デ オーチャードグラス ニ ハッセイシテ イル コックスフットモット

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Cocksfoot mosaic disease is prevalent in old cocksfoot pastures in northern and central districts of Japan. By mechanical inoculation, the virus disease transmitted readily to cocksfoot and wheat. Barley, oat and rye were also infected, but with difficulty. Setaria italica, S. viridis, bromegrass, fescue, rye-grass, thimothy and maize were not susceptible to the virus. The virus particle was spherical and about 28nm in diameter. The virus contained an RNA species having a mol. wt. of approximately 1.4×106 and a coat protein of 29, 000 in mol. wt. Thermal inactivation point was 80-85C. Two isolates of the virus, CL and M reacted strongly with the antiserum of cocksfoot mottle virus (by courtesy of Dr. Hollings, England), but not with either the antiserum of cocksfoot mild mosaic virus (by courtesy of Dr. Huth, West Germany) or the antiserum of phleum mottle virus (by Dr. Hollings, England). On the other hand, the antisera of isolates CL and M (titers, ×320) reacted positively with cocksfoot mottle virus, but with neither cocksfoot mild mosaic virus nor phleum mottle virus. Thus the virus of cocksfoot mosaic disease was identified as cocksfoot mottle virus.<br>No serological difference could be found among isolates CL, M and SN, which were isolated from cocksfoot plants manifesting different symptoms: chlorotic streak, mild mosaic and mild mosaic with severe necrosis, respectively. In particular, four major cultivars of cocksfoot in Japan were susceptible to the cocksfoot mottle virus. Cultivars, Aonami, Akimidori and Kitamidori were especially susceptible and Okamidori was rather resistant.

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