Chlorophyll a fluorescence and CO 2 exchange of Umbilicaria aprina under extreme light stress in the cold
- 28 January 1998
- journal article
- Published by Springer Nature in Oecologia
- Vol. 113 (3) , 325-331
- https://doi.org/10.1007/s004420050383
Abstract
A lichen growing in a continental Antarctic region with low temperatures and strong irradiance in summer was investigated for evidence of photoinhibition. Field experiments with Umbilicaria aprina from a sheltered site with heavy snowpack showed no effects of photoinhibition when the lichen was exposed to strong sun irradiance for nearly 11 h a day. This was evident from CO2 exchange and simultaneous chlorophyll a fluorescence measurements. CO2 exchange was also not affected if quartz glass allowing greater UV penetration, was used as a lid for the cuvette. The dependency of net photosynthesis on photosynthetic photon flux density suggests that the lichen is photophilous.Keywords
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