Abstract: 【Objective】 The inheritance analysis of the fruit-body color was carried out in this study to conduct the color breeding of Pleurotus cornucopiae. 【Method】White CCMSSC00358 (P-w) and dark grey CCMSSC00406 (P-d) were used as dikaryon parents. Seven ancestry lines were constructed, respectively, from the two dikaryon parents, two inbred lines P-w×P-w and P-d×P-d, hybrid line P-w×P-d (F1), two light grey backcross lines F1Light×P-w and F1Light×P-d, two dark grey backcross lines F1Dark×P-w and F1Dark×P-d. The fruit-body color of all the lines was observed and grouped for the statistics of inheritance analysis. 【Result】All of the 29 offsprings of inbred line P-w generated white fruit-bodies. Within the 17 offsprings of inbred lines P-d, there were 5 light grey and 12 dark grey offsprings. The segregation of light grey to dark grey was 1:3 checked by Chi-square test. Fruit-body color showed a continuous distribution among 82 offsprings of hybrid generation, and no white fruit-bodies. A total of 47 light grey offsprings and 35 dark grey offsprings were occurred, respectively, and the segregation ratio was 1:1 checked by Chi-square test. The ratio of dark grey, light grey and white was 1:4:3 in offsprings of the backcross (F1×P-w) checked by Chi-square test. The ratio of dark grey to light grey was 5:3 checked by Chi-square test, and no white fruit-body occurred in offsprings of the backcross(F1× P-d).【Conclusion】The color is quantitative trait which may be controlled by two pairs of major genes on different loci, and dark grey is incompletely dominant to white in color for P. cornucopiae.

Key words: oyster mushroom, quality breeding, quantitative trait