© 1986 Heron Publishing—Victoria, Canada
Ribulose-1,5-bisphosphate carboxylase activity of Populus tremuloides Michx. bark tissues
M. Schaedle (1) and A. A. Brayman (2)
1. Faculty of Environmental and Forest Biology, State University of New York, College of Environmental Science and Forestry,
Syracuse, New York 13210, USA / 2. Department of Radiation Biology and Biophysics, University of Rochester, Rochester, New York 14642, USA / Received December 15, 1985
Summary
Ribulose-1,5-bisphosphate (RubP) carboxylase was isolated from bark tissue of Populus tremuloides Michx. by a one-step Sephadex G l00-120 column chromatography procedure. The peak fraction had specific activity of 1.3 μmol
CO2 mg–1 chlorophyll min–1. The bark RubP carboxylase activity was comparable to that of leaf tissues. Thus, young corticular tissues are photosynthetically
competent and contain sufficient RubP carboxylase to account for the reported rates of photosynthesis.
