We wish to thank Ms M. Webber for her technical assistance during this work and gratefully acknowledge a research grant from the National Research Council of Canada.
PHYSIOLOGICAL-ENVIRONMENTAL INTERACTIONS IN LICHENS XI. SNOWCOVER AND NITROGENASE ACTIVITY
Article first published online: 2 MAY 2006
Volume 84, Issue 4, pages 703–710, April 1980
How to Cite
MacFARLANE, J. D. and KERSHAW, K. A. (1980), PHYSIOLOGICAL-ENVIRONMENTAL INTERACTIONS IN LICHENS XI. SNOWCOVER AND NITROGENASE ACTIVITY. New Phytologist, 84: 703–710. doi: 10.1111/j.1469-8137.1980.tb04782.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- (Accepted 12 August 1979)
The influence of a long term snowcover on the rates of nitrogenase activity in the lichens Peltigera canina var. praetextata and P. canina var. rufescens has been investigated. In accordance with the existing literature, only very low rates of nitrogenase activity could be detected after several months of snowcover. These low rates of activity result from prolonged darkness rather than an inactivation of the nitrogenase enzyme by low temperature. The subsequent recovery of nitrogenase activity after snowmelt is very largely controlled by the presence of radiant energy with temperature playing a subordinate role.