Abstract
Induction of phenylalanine ammonia lyase (PAL) by γ-irradiation was tissue-specific and maximum activity was obtained in bud tissue. Parenchyma tissue which showed maximum induction with light did not respond to γ-rays. Exposure of excised unirradiated bud tissue to light did not show any lag period in the induction of PAL. On the other hand, bud tissue excised from irradiated potatoes on exposure to light showed 4 h delay in further induction of PAL. The induction of PAL in parenchyma tissue was delayed by about 4 h. Reirradiation of the tissue 3 h after irradiation could not induce more PAL activity. Similarly tissues exposed to light responded to γ-irradiation only after 24 h when light-induced PAL activity started to decline. Light-induced and irradiation-induced enzymes from bud tissue showed identical properties such as optimum pH (8.8), K m (70 μM), K i for cinnamic acid (70 μM) and electrophoretic mobility.
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