Abstract
Transmission of dsRNA viruses between homo- and heterokaryotic mycelia paired on agar plates and into conidia has been studied in Heterobasidion annosum. Horizontal transmission of dsRNA occurred between both homo- and heterokaryotic isolates, as well as between isolates belonging to different intersterility groups. The proportions of vertical transmission into conidia were 3% and 55%, respectively, for the two isolates included in the study. RT-PCR of dsRNA and PCR–RFLP of mitochondrial markers were used to confirm transmission of dsRNA between the cytoplasms of different mycelia. The identity of nuclei and nuclear migration during experiments were verified using PCR–RFLP of several nuclear markers.
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