Agaricus bisporus (J.E.Lange) Imbach is a kind of edible mushroom cultivated and consumed worldwide, and has high economic value and important ecological significance. As2796 is the only main variety of A.bisporus used in China during more than 10 years, so the study on the molecular mechanism of the degeneration characteristics of this variety has important theoretical and practical significance. In this subject, the normal strain As2796, as well as two substrate-decomposing ability degeneration mutants de...