THE RELATIONSHIPS BETWEEN THE POOR PRODUC TIONS OF FRUITING BODIES AND THE FLUCTUATIONS SECTORS DERIVED FROM UNDESIRABLE CHANGED STOCKS OF PHOLIOTA-NAMEKO

Collected stocks of Pholiota nameko (T. Ito) S. Ito and Imai confirmed that the harvests of fruiting bodies were late and had declined. Thes e changed stocks were subcultured on PDA (potato-dextrose-agar) plate media, and changes of the cultural properties, nuclear phases and colo ny types of subcultured stocks were examined. For most of the changed stocks, the occupied areas of sectors with little aerial hyphae increa sed with repeated subcultures and finally they occupied whole areas. T hen dedikaryotization was observed. Only one side, of both nuclear com ponents of the dikaryon, was observed as a result of a mating type ana lysis of the monokaryon from dedikaryotization. Monokaryotic mycelium from dedikaryotization, which constituted a ''flat'' colony, lost the ability to be a recipient mycelia on PDA plate media, and it grew fast er than the original dikaryon and normal monokaryon. Most of them lost their abilities to from fruiting bodies.