Phytoparasitica (1997) 25, p. 237 (Tamada et al.)

T. Tamada, T. Kiguchi, M. Saito, T. Kusume and H. Uchino (1997)
Genome organization and function of Beet necrotic yellow vein virus (BNYVV) RNA-5
Phytoparasitica 25 (3), 237-237
The Xth International Congress of Virology, August 11-16, 1996, Binyanei haOoma, Jerusalem, Israel, lecture
Abstract: The genome of BNYVV consists generally of four RNA species: RNA-1 and RNA-2 are required for viral RNA replication, assembly and virus movement, whereas RNA-3 and RNA-4 are needed for disease development and efficient infection of sugarbeet roots under field conditions. However, some Japanese isolates contain RNA-5 which is present together with RNA-3 and RNA-4. The sequence of RNA-5 was 1347 nucleotides in length and contained a single open-reading frame encoding a polypeptide of 26 kDa. No sequence identity was found between RNA-5 and either RNA-3 or RNA-4, except for the 5'-terminal nine residues and for about the 3'-terminal 200 residues. RNA-5 induced more severe symptoms in sugar-beet roots than did isolates lacking RNA-5. The differences in yield loss were paralleled with varietal differences in the susceptibility. However, laboratory isolates containing RNA-5 but lacking RNA-3 caused much more severe damage to sugar-beet roots of partially resistant varieties than to those of susceptible varieties. Thus, BNYVV RNA-5 is involved in disease development of sugarbeet roots, which differs from symptom expression responsible for RNA-3. It seems likely that RNA-5 may play an important role in the natural infection process, although it behaves as a satellite-like RNA.
Database assignments for author(s): Tetsuo Tamada

Research topic(s) for pests/diseases/weeds:
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Beet necrotic yellow vein virus	Beet/sugarbeet (Beta vulgaris)