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Volume 138, Issue 6

Complex outcome of reciprocal exchange of nuclear DNA between two members of the basidiomycete genus Free

Abstract

Strains of the basidiomycete fungi from the USSR and from the eastern USA were interfertile, yielding viable, variable, meiotic progeny. However, interactions between paired homokaryotic mycelia of these species were unstable, yielding a uniform mycelial mat on the side, but a macroscopically heterogeneous mycelium on the side. Hyphal tips excised from the interactions gave rise to colonies identifiable as one or other of the progenitor strains or two non-progenitor types (C-types and H-types). C-types were all morphologically similar to one another and resembled the progenitor except in being inaccessible to nuclear migration and in exhibiting a light-induced phenotypic switch. They could be isolated from both sides of interactions and were somatically compatible with one another. H-types were only isolated from the side of interactions and had a range of morphologies, generally similar to the progenitor. Pairings between H-types, and between H-types and C-types sometimes resulted in pigmented interaction zones due to somatic incompatibility. Single, dual and minisatellite DNA probes were used to investigate restriction fragment length polymorphisms in progenitor and derivative strains. Nuclear, but not mitochondrial DNA from both species was detected in all non-progenitor strains obtained from beyond the interaction interface. However, whereas -specific nuclear sequences were consistently present, the distribution of -specific sequences varied, and was partly correlated with possession of H-type morphologies.

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© Society for General Microbiology 1992
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1992-06-01
2024-04-25
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Complex outcome of reciprocal exchange of nuclear DNA between two members of the basidiomycete genus Stereum
Microbiology 138, 1147 (1992); https://doi.org/10.1099/00221287-138-6-1147
/content/journal/micro/10.1099/00221287-138-6-1147
/content/journal/micro/10.1099/00221287-138-6-1147
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