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J Gen Virol 66 (1985), 1221-1232; DOI 10.1099/0022-1317-66-6-1221
© 1985 Society for General Microbiology
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Isolation of a Virus from Virulent Strains of Rhizoctonia solani

Aliza Finkler1, Y. Koltin1, I. Barash2, B. Sneh3 and D. Pozniak3

1 Department of Microbiology
2 Department of Botany
and3 Institute for Nature Conservation Research, Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69 978 Tel Aviv, Israel

Double-stranded RNA viruses were detected in virulent strains of Rhizoctonia solani. The virus particles were 33 nm in diameter, contained two or three major segments of dsRNA (mol. wt. 1.6 x 106, 1.45 x 106 and 1.25 x 106), had a density of 1.34 g/ml and had an estimated sedimentation coefficient of 161S. The major coat protein had a mol. wt. of 46000. An RNA-dependent RNA polymerase activity was associated with the viral capsids. Native hypovirulent strains of R. solani were devoid of these viruses and attenuation of virulent strains to hypovirulence appeared to be correlated with the loss of some or all of the segments of dsRNA. Transmission of dsRNA from a virulent to a hypovirulent strain by heterokaryon formation was associated with the transmission of virulence.

Keywords: dsRNA virus, R. solani, virulence

Received 24 October 1984; accepted 1 February 1985.


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 MycologiaHome page
N. D. Charlton and M. A. Cubeta
Transmission of the M2 double-stranded RNA in Rhizoctonia solani anastomosis group 3 (AG-3).
Mycologia, November 1, 2007; 99(6): 859 - 867.
[Abstract] [Full Text] [PDF]


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