Occurrence of rhizomania of sugarbeet in Egypt associated with beet necrotic yellow vein benyvirus infection [electronic resource].

Includes references.

The presence of beet necrotic yellow vein virus (BNYVV) associated with rhizomania of sugarbeet (Beta vulgaris L.) was confirmed for the first time in Egypt in some cultivations of sugarbeet in El-Fayoum and Giza governorates. The causative virus was soil-transmitted through the viruliferous Polymyxa betae Keskin fungus. Confirming results were brought about through mechanical inoculation, host range studies, visual and light microscopy examination of infected sugarbeet roots, infectivity studies using the viruliferous fungus, as well as serological testing using authentic monoclonal and polyclonal antisera. The virus was transmitted mechanically to sugarbeet, Spinacia oleracea L., Chenopodium amaranticolor Coste & Reyn, and C. quinoa Willd.. Infected roots showed malformation necrosis, and proliferation of large numbers of lateral roots. Light microscopy examination of such roots indicated the presence of fungal cystosori associated with root cell death and root discoloration.

Summary in Arabic.

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