Abstract
In this paper we review the available information on the possibility of gene flow between the European types A and B of Gremmeniella abietina (Lagerb.) Morelet. In nature, types A and B may have mycelial interactions in pine seedlings and lower branches covered by snow during winter. In artificial conditions, the two types are able to produce low-fitness hybrids. The distinct virus populations of the two types, however, suggest that the importance of any possible hybridization in nature is negligible.Key words: interspecific mating, introgression, dsRNA.
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