TY - JOUR
T1 - Molecular characterisation of an endornavirus from Rhizoctonia solani AG-3PT infecting potato
AU - Das, Subha
AU - Falloon, Richard E.
AU - Stewart, Alison
AU - Pitman, Andrew R.
N1 - Funding Information:
We acknowledge Potatoes New Zealand and the New Zealand Ministry of Business, Innovation and Employment (Programme LINX0804) for financial support. We also thank Dr Grant Smith and Dr Arnaud Blouin for their critique of the manuscript during preparation.
Publisher Copyright:
© 2014 The British Mycological Society.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/11/1
Y1 - 2014/11/1
N2 - Rhizoctonia solani (teleomorph: Thanatephorus cucumeris) is a soil. -borne plant pathogenic fungus that has a broad host range, including potato. In this study, the double-stranded RNA (dsRNA) profiles were defined for 39 Rhizoctonia solani isolates representative of two different anastomosis groups (AGs) associated with black scurf of potato in New Zealand. A large dsRNA of c. 12kb-18kb was detected in each of the isolates, regardless of AG or virulence on potato. Characterisation of the large dsRNA from R. solani AG-3PT isolate RS002, using random amplification of total dsRNA and analyses of overlapping cDNA sequences, resulted in the assembly of a consensus sequence of 14 694nt. A single, large open reading frame was identified on the positive strand of the assembled sequence encoding a putative polypeptide of at least 4893 amino acids, with a predicted molecular mass of 555.6kDa. Conserved domains within this polypeptide included those for a viral methyltransferase, a viral RNA helicase 1 and an RNA-dependent RNA polymerase. The domains and their sequential organisation revealed the polyprotein was very similar to those encoded by dsRNA viruses of the genus Endornavirus, in the family Endornaviridae. This is the first report of an endornavirus in R. solani, and thus the putative virus is herein named Rhizoctonia solani endornavirus - RS002 (RsEV-RS002). Partial characterisation of the large dsRNAs in five additional AG-3PT isolates of R. solani also identified them as probable endornaviruses, suggesting this family of viruses is widespread in R. solani infecting potato. The ubiquitous nature of endornaviruses in this plant pathogen implies they may have an important, but yet uncharacterised, role in R. solani.
AB - Rhizoctonia solani (teleomorph: Thanatephorus cucumeris) is a soil. -borne plant pathogenic fungus that has a broad host range, including potato. In this study, the double-stranded RNA (dsRNA) profiles were defined for 39 Rhizoctonia solani isolates representative of two different anastomosis groups (AGs) associated with black scurf of potato in New Zealand. A large dsRNA of c. 12kb-18kb was detected in each of the isolates, regardless of AG or virulence on potato. Characterisation of the large dsRNA from R. solani AG-3PT isolate RS002, using random amplification of total dsRNA and analyses of overlapping cDNA sequences, resulted in the assembly of a consensus sequence of 14 694nt. A single, large open reading frame was identified on the positive strand of the assembled sequence encoding a putative polypeptide of at least 4893 amino acids, with a predicted molecular mass of 555.6kDa. Conserved domains within this polypeptide included those for a viral methyltransferase, a viral RNA helicase 1 and an RNA-dependent RNA polymerase. The domains and their sequential organisation revealed the polyprotein was very similar to those encoded by dsRNA viruses of the genus Endornavirus, in the family Endornaviridae. This is the first report of an endornavirus in R. solani, and thus the putative virus is herein named Rhizoctonia solani endornavirus - RS002 (RsEV-RS002). Partial characterisation of the large dsRNAs in five additional AG-3PT isolates of R. solani also identified them as probable endornaviruses, suggesting this family of viruses is widespread in R. solani infecting potato. The ubiquitous nature of endornaviruses in this plant pathogen implies they may have an important, but yet uncharacterised, role in R. solani.
KW - Double-stranded RNA
KW - Methyltransferase
KW - RNA helicase 1
KW - RNA-dependent RNA polymerase
KW - Virulence
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U2 - 10.1016/j.funbio.2014.08.003
DO - 10.1016/j.funbio.2014.08.003
M3 - Article
C2 - 25442295
AN - SCOPUS:84908555082
SN - 1878-6146
VL - 118
SP - 924
EP - 934
JO - Mycological Research
JF - Mycological Research
IS - 11
ER -
