Activation of intracellular and extracellular phenol oxidases in photoinduced fruit-body formation ofFavolus arcularius

The activation of intracellular phenol oxidase (PO) was associated with the photoinduced fruit-body initiation inFavolus arcularius. The second activation of PO activity was also photoinduced in the rapidly developing stipe after the formation of pileus primordium under light exposure. However, the activity levels in the pileus and the mycelium remained low even in the cultures exposed to light. The extracellular PO activity in the culture filtrate also appears to be developmentally regulated: it rose sharply after primordium formation in the light, then decreased rapidly during further development of the fruit-body.