PHYSIOLOGICAL-ENVIRONMENTAL INTERACTIONS IN LICHENS
VIII. THE ENVIRONMENTAL CONTROL OF DARK CO2 FIXATION IN PARMELIA CAPERATA(L.) ACH. AND PELTIGERA CANINA VAR. PRAETEXTATA HUE
Article first published online: 2 MAY 2006
Volume 83, Issue 2, pages 433–444, September 1979
How to Cite
KERSHAW, K. A., MORRIS, T., TYSIACZNY, M. J. and MacFARLANE, J. D. (1979), PHYSIOLOGICAL-ENVIRONMENTAL INTERACTIONS IN LICHENS. New Phytologist, 83: 433–444. doi: 10.1111/j.1469-8137.1979.tb07468.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- (Accepted 19 February 1979)
The occurrence of dark CO2 fixation in Peltigera cardna var. praetextata and Parmelia caperata is reported, with rates of 15 to 27 % and 10 to 12 % respectively of the equivalent light photo-synthetic rate. The pattern of incorporation into oxaloacetate, malate, citrate, alanine and aspartate points to fixation via PEP and provides both anaplerotic replenishment of TCA cycle intermediates as well as active amino acid and protein synthesis in the dark.
The environmental control of the rate of dark CO2 fixation by temperature, moisture and season is factorially examined and the potential role of dark CO2 fixation in the ecology of a lichen is briefly discussed.