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Abstract: In a population of 30 A. aegerita wild strains from different European locations, dsRNAs exhibited a widespread occurrence accompanied by an inter-strain variability in number and size. The dsRNAs, detected in eight of the studied strains, ranged in size from 1.5 to 2.7 kb and hybridized with a probe constituted by the previously characterized naked M-dsRNAs of the wild strain WT-3. DsRNAs were shown to be efficiently transmitted from the vegetative dikaryotic mycelium to the differentiated basidiocarps, but not efficiently to the homokaryotic progeny, thus limiting the vertical transmission and suggesting a vesicular location. In matings between a dikaryon containing naked dsRNAs and a compatible dsRNA-free homokaryon, dsRNAs were not transmitted, suggesting that transmission of the cytoplasmic dsRNA-containing organites was lacking, or at least limited to the fusion line, during plasmogamy and the concomitant nuclear migration.
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