The effects of daily exposure to UV-A light on phenylalanine ammonia-lyase activity during the growth of barley plants.
The activity of phenylalanine ammonia-lyase (PAL) during the life cycle of barley plants (Hordeum distichon L.) exposed to UV-A radiation (355 nm) during 15, 30 and 60 min day-1 was studied. In comparison with the control plants, a stimulatory effect on PAL activity was observed. This effect was directly related to the exposure time to UV-A radiation. It was also noted that the amount of protein extracted, decreased significantly with age increase in all treatments. The studied enzyme showed its highest activity during early stages of growth. A sharp and progressive decline in PAL activity was observed in older plants. This decrease was more evident during the development of the ear.
Baztan
J
J
Departamento de Biología Vegetal II, Facultad de Farmacia, Madrid, Spain.
Torres
M
M
D000642:Ammonia-Lyases / Q000378:metabolism*; D001467:Hordeum; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism*; D063245:Plant Development; D010944:Plants / Q000528:radiation effects; D013997:Time Factors; D014466:Ultraviolet Rays
D000642:Ammonia-Lyases; D010650:Phenylalanine Ammonia-Lyase