SELFREPRODUCTION INDUCED VARIABILITY IN AGRONOMIC TRAITS FOR A WILD AGARICUS-BISPORUS

Consequences of selfreproduction (intramictic reproduction) were studi ed on a wild Agaricus bisporus var. bisporus strain. Individual variat ions were observed on several agronomic traits, natural cap color, sus ceptibility to bacterial blotch, mycelial growth and yield, for each o f the two studied intramictic generations. RAPD markers showed a high level of recombination between intramictic generations. With all trait s, the same level of transgression was obtained at each generation, wi th the exception of mycelial growth which dramatically increased in th e first generation. Bacterial blotch susceptibility decreased, reachin g a threshold, therefore resistance was not reached. Variability induc ed by intramictic reproduction in A. bisporus could be integrated favo rably in breeding programs.