Abstract
Five white fruitbodies of Ganoderma lucidum found from two different mushroom farms, and the characteristics of atypical fruiting structure formation of these strains were described. The white fruitbodies were spontaneously generated on Quercus-log during the cultivation. They did not differentiate to the normal fruitbodies with pileus, hymenium, stipe and coloration, and fruitbodies remained non-laccateed even after 3 months. Dikaryotic mycelia isolated from the five white fruitbodies differed from wild-type strains in the mycelial growth rate, colony color, and the capacity of atypical fruiting structure (AFS) formation on agar media. These white mutants readily induced brown colored AFSs on the colonies under ventilation and illumination conditions. Both isolates Gl-010 and Gl-011 that were obtained from a normal and white fruitbody, respectively, did not form AFSs in the dark and/or under black light blue (BLB) light illumination, but induced under the visible light. They required dim light for the AFS formation, and the AFS formation was inhibited up to $0.5{\mu}mol\;m^{-2}\;S^{-1}$ in light intensity. However, the other four isolates induced AFSs even in the dark and BLB illumination, although their parent strain, isolate Gl-030, did not form AFSs under any light conditions. The monokaryotic mycelia derived from basidiospores of the AFSs of the white mutants were compatible with the original culture (dikaryon) on a dual culture.
영지버섯 원목재배시 발생한 백색자실체에서 2핵 균사체 5균주를 분리하였다. 이들 균주의 자실체는 정상적인 갓, 자실층, 대로 분화되지 않았고, 발생해서 3개월 후에도 착색되지 않았다. 이들 백색자실체 형성균주와 재배용 균주는 배지상에서의 생장률, 균총의 색 그리고 비정형자실체(atypical fruiting structure; AFS) 형성에 차이를 보였다. 백색자실체 형성균주는 환기와 광 조건하에서 갈색의 AFS를 쉽게 형성하였다. Gl-010과 Gl-011 균주는 암상태와 BLB 광을 조사하였을 때에는 AFS를 형성하지 않았지만, 가시광선하에서는 AES를 형성하였다. 이들 균주의 AFS형성은 $0.5{\mu}mol\;m^{-2}\;s^{-1}$ 이하의 약한 광에서 잘 형성되었고, 그 이상의 광도에서는 억제를 받았다. 한편, Gl-010과 Gl-011 균주 이외의 4 균주는 암상태와 BLB에서도 AFS를 잘 형성하였으나, 이들의 모균주인 Gl-030은 어때한 광 조건하에서도 AFS를 형성하지 못하였다. AFS에서 형성된 담자포자를 발아시켜 얻은 단핵 균사체는 모균주와 화합성이었다.
