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Sexual polarity of the armillaria mellea group






Cryptogamie Mycologie 4(3): 301-319

Sexual polarity of the armillaria mellea group

The sexual behavior of single spore cultures of the A. mellea group was studied. These cultures were isolated from 18 basidiocarps belonging to 4 spp.: A. pseudobulbosa nomen nudum, A. obscura (Secretan) Romagn., A. mellea (Vahl) Karst s.s., A. bulbosa (Barla) Romagn. (also referred to by Korhonen as species B, C, D, E, respectively). The polysporous cultures of Armillaria are not dikaryotic, but diploid. Clamp connections are not found in the vegetative mycelium. Thus the only criterion available to detect the successful mating of 2 monosporous cultures is the crustaceous aspect of the resultant diploid thallus. All the fungal specimens studied were heterothallic and tetrapolar. The 2 incompatibility loci play different roles: the matings are incompatible if the same genera are present on one of the loci (called locus A), whatever the condition on the other locus, B. If the same genes are present on B (and different genes on A), hemicompatibility can be obtained. Hemicompatibility results in the formation of a special diploid mycelium which is unstable and slow growing. Fruitbodies could be obtained in pure culture, mostly with species A. obscura and A. borealis (species A according to Korhonen). These fertile fruitbodies gave rise to single spore cultures which have followed in subsequent matings, a heterothallic and tetrapolar pattern (as do the natural haploid strains). The life cycle of A. obscura and A. borealis in vitro was sometimes different from that observed in nature. Dikaryons and clamp connections were not observed in the subhymenium of many of the basidiocarps obtained in pure culture. Fruitbodies were obtained from synthetic diplonts of A. obscura (diplonts obtained from compatible matings carried out in the laboratory). Thus it is possible to reproduce in vitro a complete cycle of an Armillaria species.


Accession: 006408847



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