The author is much indebted to Professor L. O. Björn for advice and criticism during the investigation and to Dr. Gunnar Öquist for constructive criticism of the manuscript.
Some effects of humidity on the light reaction of photosynthesis in the lichens Cladonia impexa and Collema flaccidium
Article first published online: 28 APR 2006
Volume 49, Issue 3, pages 320–326, July 1980
How to Cite
SIGFRIDSSON, B. (1980), Some effects of humidity on the light reaction of photosynthesis in the lichens Cladonia impexa and Collema flaccidium. Physiologia Plantarum, 49: 320–326. doi: 10.1111/j.1399-3054.1980.tb02671.x
- Issue published online: 28 APR 2006
- Article first published online: 28 APR 2006
- (Received 16 January, 1980; revised 24 March, 1980)
- Cladonia impexa;
- Collema flaccidium;
Luminescence and fluorescence were measured at different relative humidities in the lichen Cladonia impexa Harm. Both parameters showed a constant value at relative humidities lower than 80%: thereafter they increased. Low relative humidity was found to decrease energy transfer from chlorophyll b to chlorophyll a. inhibit electron transport, lower electron holding capacity on the reduced side of photosystem two and impair far-red-induced afterglow, reflecting photophosphorylation. In Collema flaccidium Ach. Ach. energy transfer from the accessory pigments phycocyanin and phycoerythrin to chlorophyll a was only possible at high relative humidity. The results are interpreted as due to conformational changes caused by changed water content in the lichen.