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Abstract
Dark-grown colonies of the fungus Trichoderma viride exhibited an immediate transient increase (by about 100%) of the intracellular concentration of ATP when exposed to white light. ATP reached its maximum concentration after about 15 min and returned to its original value after about 30 min after the onset of illumination, whether the illumination was discontinued or not. On the other hand, only a slight decrease in the concentration of ADP, and practically no change in the concentration of AMP in the illuminated mycelia were observed. The increase of the ATP concentration in mycelia was reflected in the rise in concentration of total adenylates and in the transient increase of adenylate energy charge from 0·66 to 0·77. Randomly chosen non-sporulating mutants of the same strain of T. viride did not show any significant changes in the concentrations of adenine nucleotides after exposure to light.
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