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Plant Physiology 54:41-43 (1974) © 1974 American Society of Plant Biologists L-Phenylalanine Ammonia-lyase Activity in Robinia pseudoacacia SeedlingsI. Cyclic Phenomenon Activity during Continuous Light 1a School of Forestry, University of Missouri, Columbia, Missouri 65201
Influences of light and darkness on L-phenylalanine ammonia-lyase activity of black locust (Robinia pseudoacacia) seedlings were studied. Light initiates both an increase in enzyme activity (or enzyme synthesis) and a subsequent decrease in activity. These dual influences of light create cyclic changes in L-phenylalanine ammonia lyase activity in continuous light. The cyclic changes in activity (during continued light) cannot be attributed to an endogenous rhythm and rather are related to the changes in balance between the enzyme activity and its inactivating system.
2 Present address: Institute of Botany, University of Warsaw, Warsaw, Krakowskie Przedmie cie 26/28 Poland. 1 This research was a contribution from the Missouri Agricultural Experiment Station. Journal Series No. 6855.
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