Comparison of physiological characteristics of Japanese and Thai oyster mushrooms and their F₁ hybrid

Abstract

　Japanese, Thai and their F₁ hybrid stocks of Pleurotus ostreatus were cultivated at 22°C during the spawn-run time, then at 15°C or 22°C during fruiting. There was no noticeable difference in change of CO₂ concentrations in sawdust-ricebran substrata between Japanese and Thai stocks during spawn-run time. However, Thai stocks fruited and raised CO₂ concentration of the substrata earlier than did Japanese stocks at both temperatures. At 22°C, Thai stocks formed plentiful fruit-body primordia that grew into normal fruit-bodies, while Japanese stocks formed sparse primordia that failed to follow normal growth. These traits of Japanese and Thai stocks segregated in their F₁ hybrid stocks, and many F₁ stocks represented the Thai phenotype.