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A mycoreovirus suppresses RNA silencing in the white root rot fungus, Rosellinia necatrix.

Abstract：

:RNA silencing is a fundamental antiviral response in eukaryotic organisms. We investigated the counterdefense strategy of a fungal virus (mycovirus) against RNA silencing in the white root rot fungus, Rosellinia necatrix. We generated an R. necatrix strain that constitutively induced RNA silencing of the exogenous green fluorescent protein (GFP) gene, and infected it with each of four unrelated mycoviruses, including a partitivirus, a mycoreovirus, a megabirnavirus, and a quadrivirus. Infection with a mycoreovirus (R. necatrix mycoreovirus 3; RnMyRV3) suppressed RNA silencing of GFP, while the other mycoviruses did not. RnMyRV3 reduced accumulation of GFP-small interfering (si) RNAs and increased accumulation of GFP-double-stranded (ds) RNA; suggesting that the virus interferes with the dicing of dsRNA. Moreover, an agroinfiltration assay in planta revealed that the S10 gene of RnMyRV3 has RNA silencing suppressor activity. These data corroborate the counterdefense strategy of RnMyRV3 against host RNA silencing.

journal_name

Virology

journal_title

Virology

authors

Yaegashi H,Yoshikawa N,Ito T,Kanematsu S

doi

10.1016/j.virol.2013.07.010

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

409-16

issue

1-2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(13)00430-3

journal_volume

444

pub_type

杂志文章

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