Effect of Light on the Sclerotial Formation of Sclerotinia sclerotiorum(Lib.) de Bary

균핵병균(Sclerotinia sclerotiorum(Lib.) de Bary)의 균핵형성에 미치는 광선의 영향

Present paper was attempted to investigate the effects of the light on the sclerotium formation of some isolates of Sclerotinia sclerotiorum(Lib.) do Bary from lettuce, cucumber and rape. The investigations were performed in the both aspects inducing sclerotial primordia from the mycelial colony and developing such primordia. The cultures were grown on potato-dextrose agar and were treated with day-light fluorescent lamps. In the continuous light illumination for 21 days, numbers of sclerotial primordia and matured sclerotia were increased with increasing the light intensity up to about 500 Lux, but on the contrary the dry-weight of matured sclerotia was decreased. In the 800 Lux illumination, induction of the primordia was extremely depressed, and then matured sclerotia were almost not produced. Short-time illumination for 48 hours, although the light intensity was as high as 5000 Lux, increased the numbers of sclerotial primordia and matured sclerotia. Dry-weight of matured sclerotia, however, was slightly increased only at low intensity of 160 Lux. On the other hand, the light shock which u·as alternatively on-of light every one minute for 48 hours increased the number and dry-weight of sclerotia produced, but the former was more effective at 500 Lux shock and the later more effective at 160 Lux shock.

Sclerotinia sclerotiorum(Lib.) de Bary의 상치, 오이 및 유채의 3균주에 대하여 PDA를 기본부지로하여 광선이 이들의 균핵형성에 미치는 영향을 연구하였다. 광원으로서는 주광색 형광등을 사용하였다. 그 결과를 요약하면 다음과 같다. 1) 계속광처리에서 광도 480Lux까지는 광도가 증가함에 따라 증가했지만 성숙균핵의 건물중은 이와는 반대로 감소하였다. 그리고 800 Lux 처리에서는 균핵시원체의 유기가 크게 억제되었고 성숙균핵은 거의 형성되지 않았다. 2) 5000Lux의 고광도라 하더라도 48시의 단시간처리는 균핵시원체수 및 성숙균핵수를 증가시켰다. 그러나 성숙균핵의 건물중은 160 Lux에서만 다소 증가하는 경향이 있었다. 3) 광 shock 즉 1분간치의 계속광 48시간까지의 160 Lux, 500Lux 처리는 모두 균핵형성수와 건물중을 증가시켰는데 균핵형성수와 건물중을 증가시켰는데 균핵형성수는 500Lux에서 균핵건물중은 160Lux에서 더 높았다.