Range Science Department, Utah State University, Logan, Utah, USA, 84322.
A MATHEMATICAL DESCRIPTION OF THE EFFECT OF RESATURATION ON NET PHOTOSYNTHESIS IN THE LICHEN, PARMELIA PRAESIGNIS NYL.
Article first published online: 2 MAY 2006
Volume 96, Issue 2, pages 257–262, February 1984
How to Cite
LINK, S. O. and NASH, T. H. (1984), A MATHEMATICAL DESCRIPTION OF THE EFFECT OF RESATURATION ON NET PHOTOSYNTHESIS IN THE LICHEN, PARMELIA PRAESIGNIS NYL. New Phytologist, 96: 257–262. doi: 10.1111/j.1469-8137.1984.tb03562.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- (Accepted 11 October 1983)
Resaturation respiration occurs in Parmelia praesignis Nyl., although it is not strongly developed as in other lichens. Less than 2 h was required for full recovery of photosynthetic ability after having been dry for at least 5 weeks. After three daily, 4 h soaking periods the time for recovery was reduced to 11 min. The resaturation phenomenon is mathematically described for the first time as a negative exponential from which parameters can be derived for maximal net photosynthetic rate, maximal velocity and the velocity at the half-time for recovery. Net photosynthetic rate was independent of the period of drought. The velocity at the half-time for recovery increased by 81% after one soaking period and by 990% after two.