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Seven new mycoviruses identified from isolated ascomycetous macrofungi.

Virus Research 2023 December 2
Mycoviruses have been described in all major fungal taxonomic groups. There has been much focus on commercially cultivated basidiomycetous macrofungi, while attention to viruses from ascomycetous macrofungi is lacking. Therefore, in this study, we conducted viral screening against fungal mycelia that were regenerated from ascomycetous macrofungi using agarose gel electrophoresis (AGE) and fragmented and primer-ligated dsRNA sequencing (FLDS). Among the 57 isolates, four isolates were detected with virus-like bands through screening with AGE, and subsequent FLDS analyses determined the viral sequences. Other isolates without virus-like bands in AGE were pooled to check for viral sequences. Using FLDS analysis, a total of seven new mycoviruses were identified, including two double-stranded RNA (dsRNA) viruses belonging to Quadriviridae and Partitiviridae, five positive-sense single-stranded RNA (ssRNA) viruses (three belonging to Mitoviridae, one belonging to Endornaviridae and one belonging to Virgaviridae). All viruses characterized in this study are novel species, and all the hosts are firstly reported to be infected by mycoviruses. These findings expand our knowledge of the diversity of mycoviruses from macrofungi in natural environments.

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