Abstract
Exogenous supply of L-phenylalanine (L-PHE) or trans-cinnamic acid (ATC) to radish cotyledons illuminated with far-red light (RL) causes a large decrease of L-phenylalanine ammonia-lyase (PAL) level during the phase of increasing activity, whereas D-phenylalanine (D-PHE), a competitive inhibitor of PAL exerts a strong stimulation upon the level of PAL activity. The decrease of PAL activity, after cessation of irradiation, or under continuous far-red light after the maximum of PAL activity is reached, cannot be prevented by supplying cotyledons with D-PHE. The results suggest; 1: that ATC plays an important part by controlling repression of PAL synthesis and 2: that the intervening of PAL inactivator synthesis is unlikely.
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