A novel betapartitivirus RnPV6 from Rosellinia necatrix tolerates host RNA silencing but is interfered by its defective RNAs

Sotaro Chiba, Yu Hsin Lin, Hideki Kondo, Satoko Kanematsu, Nobuhiro Suzuki

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The family Partitiviridae comprises of five genera with bi-segmented dsRNA genomes that accommodate members infecting plants, fungi or protists. All partitiviruses with only a few exceptions cause asymptomatic infections. We report the characterization of a novel betapartitivirus termed Rosellinia necatrix partitivirus 6 (RnPV6) from a field isolate of a plant pathogenic fungus, white root rot fungus. RnPV6 has typical partitivirus features: dsRNA1 and dsRNA2 are 2462 and 2499 bps in length encoding RNA-dependent RNA polymerase and capsid protein. Purified particles are spherical with a diameter of 30 nm. Taking advantage of infectivity as virions, RnPV6 was introduced into a model filamentous fungal host, chestnut blight fungus to investigate virus/host interactions. Unlike other partitiviruses tested previously, RnPV6 induced profound phenotypic alterations with symptoms characterized by a reduced growth rate and enhanced pigmentation and was tolerant to host RNA silencing. In addition, a variety of defective RNAs derived from dsRNA1 appear after virion transfection. These sub-viral RNAs were shown to interfere with RnPV6 replication, at least for that of cognate segment dsRNA1. Presence of these sub-viral elements resulted in reduced symptom expression by RnPV6, suggesting their nature as defective-interfering RNAs. The features of RnPV6 are similar to but distinct from those of a previously reported alphapartitivirus, Rosellinia necatrix partitivirus 2 that is susceptible to RNA silencing.

Original languageEnglish
Pages (from-to)62-72
Number of pages11
JournalVirus research
Volume219
DOIs
Publication statusPublished - Jul 2 2016

Keywords

  • Cryphonectria parasitica
  • Defective RNA
  • Partitivirus
  • RNA silencing
  • Rosellinia necatrix
  • dsRNA virus

ASJC Scopus subject areas

  • Cancer Research
  • Virology
  • Infectious Diseases

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