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Abstract: In the course of the present work, the effect of light, and how it operates at all stages of Pleurotus growth were studied. The findings point to the formation of reactive oxygen species (ROS), as a result of illuminating the growth substrate. These ROS, which are toxic, penetrate the mycelium of the mushroom, inhibit its growth, and cause changes in the enzymatic system that neutralizes the ROS, ultimately stimulating the formation of fruiting bodies. The pattern of catalase activity in response to white light was characterized by a drop in activity during the first hours of illumination, followed by a return to its former level and then another drop in activity. This phenomenon was more salient in young vs. old mycelia. Addition of rose bengal to the fiingal growth medium and illumination with orange light gave the same pattern of catalase activity. It can be concluded , that the effect of light on the enzyme was caused by an active oxygen product, evidently singlet oxygen, and was not the result of direct photoinactivation.
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