ISSN:
1432-1939
Keywords:
Key wordsUmbilicaria aprina
;
CO2 exchange
;
Chlorophyll a fluorescence
;
Low temperatures
;
Photoinhibition
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004420050383
