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Beet necrotic yellow vein virus (BNYVV) is a plant virus, transmitted by the protozoan ''Polymyxa betae'' (initially thought to be a fungus)〔Keskin B (1964) Polymyxa betae n.sp., a parasite in the roots of Beta vulgaris tournefort, particularly during the early growth of the sugar beet. Arch Mikrobiol 19: 348-374〕). ''Polymyxa'' forms highly resistant spores that can rest in soils for more than two decades.〔Adams MJ (1990) Epidemiology of fungally-transmitted viruses. Soil Use and management 6: 184-189 〕〔Maraite H (1991) Transmission of viruses by soil fungi. In: Developments in agricultural and managed-forest ecology: biotic interactions and soil-borne diseases, Amsterdam, NL. Elsevier Science Publishers, pp 67-82 〕 The virus can rest in these spores, and when the spores germinate into mobile zoospores, they transmit the virus to the plant.〔Barr DJS (1988) Zoosporic plant parasites as fungal vectors of viruses: taxonomy and life cycles of species involved. In: Developments in Applied Biology II Viruses with Fungal Vectors, Wellesbourne, UK. Association of Applied Biologists, pp 123-137 〕 The BNYVV is the type member of the ''Benyvirus'' genus〔Tamada T (1999) Benyviruses. In: Webster R, Granoff A (eds) Encyclopedia of Virology, 2nd edt. Academic Press, New York, N.Y., pp 154-160 〕 and is responsible for rhizomania, a disease of sugar beet (Rhizo: root; Mania: madness) that causes proliferation of thin rootlets, and leads to a smaller tap root with reduced sugar content. Infected plants are less able to take up water, and wilting can be observed during the warm period of the year. If the infection spreads to the whole plant, vein yellowing, necrosis and yellow spots appear on the leaves, giving the virus its name. Depending on the isolate, the virus comprises four to five rod-shaped particles, each containing a different positive sense RNA. Each RNA has a 5' cap and 3' polyadenylation.〔Putz C (1977) Composition and structure of Beet necrotic yellow vein virus. Journal of General Virology 35: 397-401〕 ==External links== *(ICTVdB - The Universal Virus Database: Beet necrotic yellow vein virus ) *(Family Groups - The Baltimore Method ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Beet necrotic yellow vein virus」の詳細全文を読む スポンサード リンク
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