Novel mitoviruses in Rhizoctonia solani AG-3PT infecting potato

Subha Das, Richard E. Falloon, Alison Stewart, Andrew R. Pitman

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Double-stranded RNA (dsRNA) elements are ubiquitous in Rhizoctonia solani. Total dsRNA was randomly amplified from a R. solani isolate (RS002) belonging to anastomosis group-3PT (AG-3PT), associated with black scurf in potato. Assembly of resulting cDNA sequences identified a nearly complete genome of a novel virus related to the genus Mitovirus (family Narnaviridae), herein named Rhizoctonia mitovirus 1 RS002 (RMV-1-RS002). The 2797 nucleotide partial genome of RMV-1-RS002 is A-rich (59.06 %), and can be folded into stable stem-loop structures at 5' and 3' ends. Universal and mold mitochondrial codon usages revealed a large open reading frame in the genome, putatively encoding an 826 amino acid polypeptide, which has conserved motifs for mitoviral RNA-dependent RNA polymerase. The full length putative polypeptide shared 25.6 % sequence identity with the corresponding region of Tuber excavatum mitovirus (TeMV). The partial genome of a second mitovirus (proposed name Rhizoctonia mitovirus 2 RS002 (RMV-2-RS002)) was also amplified from RS002. A nearly identical copy of RMV-1-RS002 was detected in two additional AG-3PT isolates. These data indicate that multiple mitoviruses can exist in a single isolate of R. solani AG-3PT, and that mitoviruses such as RMV-1-RS002 are probably widespread in this pathogen. The roles of mitoviruses in the biology of R. solani AG-3PT remain unknown.

Original languageEnglish
Pages (from-to)338-350
Number of pages13
JournalFungal Biology
Volume120
Issue number3
DOIs
Publication statusPublished - Mar 1 2016
Externally publishedYes

Keywords

  • Double-stranded RNA (dsRNA)
  • Hypovirulence
  • Mycovirus
  • Narnaviridae
  • RNA-dependent RNA polymerase (RdRp)

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Infectious Diseases

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