Transmission of PsV-F and PsV-S Mycoviruses during Conidiogenesis of Penicillium stoloniferum

Abstract
SUMMARY: Levels of both fast and slow Penicillium stoloniferum virus (PsV-F and PsV-S) were evaluated in single conidial isolates of P. stoloniferum NRRL5267. Approximately 7 % (3/43) of a random population of conidia from a culture of P. stoloniferum contained no PsV-F, while other conidia produced cultures with various levels of PsV-F. The greatest variation in PsV-F levels was observed in single conidial isolates from cultures that contained low to intermediate levels of virus, i.e. 11 to 25 E1cm260 units per g dry weight of mycelium. The least variation was seen in isolates from a culture with a high PsV-F level (37 E260 units per g dry weight of mycelium). Two of the original 43 single conidial isolates contained no detectable PsV-F or PsV-S. Of the second-generation single conidial isolates from an original PsV-S+ PsV-F- isolate, 6 % failed to show detectable PsV-S.

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