| Title | Low-temperature limitation of primary photosynthetic processes in Anatrctic lichens Umbilicaria antarctica and Xanthoria elegans |
| Author | Bartak, M.; Vaczi, P.; Hajek, J.; Smykla, J. |
| Author Affil | Bartak, M., Masaryk University, Department of Plant Physiology and Anatomy, Institute of Experimental Biology, Brno, Czech Republic. Other: Institute of Nature Conservation, Poland |
| Source | Polar Biology, 31(1), p.47-51, . Publisher: Springer-Verlag, Berlin, Federal Republic of Germany. ISSN: 0722- 4060 |
| Publication Date | Dec. 2007 |
| Notes | In English. 31 refs. Ant. Acc. No: 83550. GeoRef Acc. No: 282395 |
| Index Terms | chlorophylls; ecology; lichens; photosynthesis; temperature; Antarctica; chlorophyll; organic compounds; photochemistry; pigments |
| Abstract | Temperature response curves of chlorophyll a fluorescence parameters were used to assess minimum sub-zero temperature assuring functioning of photosynthetic photochemical processes in photosystem II (PS II) of Antarctic lichens. Umbilicaria Antarctica and Xanthoria elegans were measured within the temperature range from - 20 to +10°C by a fluorometric imaging system. For potential and actual quantum yields of photochemical processes the minimum temperature was found to be between -10 and - 20°C. Non-photochemical quenching (NPQ) of absorbed excitation energy increased with temperature drop reaching maximum NPQ at - 15°C. (mod. journ. abst.) |
| URL | http://hdl.handle.net/10.1007/s00300-007-0331-x |
| Publication Type | journal article |
| Record ID | 62002825 |