0026316 - BÚ 2006 RIV CZ eng J - Journal Article
Kvíderová, Jana - Stibal, Marek - Nedbalová, Linda - Kaštovská, Klára
The first record of snow algae vitality in situ by variable fluorescence of chlorophyll.
[První záznam vitality sněžných řas in situ pomocí variabilní fluorescence chlorofylu.]
Czech Phycology. Roč. 5, - (2005), s. 69-77. ISSN 1213-3434
R&D Projects: GA AV ČR(CZ) KJB6005409
Institutional research plan: CEZ:AV0Z6005908
Keywords : snow algae * fluorescence * Chlamydomonas
Subject RIV: EF - Botanics

Although snow algae may serve as very good model organisms for their adaptation to extreme environments, ecophysiological studies of them are rare. In our study, we measuerd the dependence of relative electron transfer rate on the irradiance of natural samples by variable fluorescence of chlorophyll directly in the field. The sample consisted mainly of zygospores of Chlamydomonas brevispina (FRITSCH) Hoh. Roem. et MULI. The cell density in the snow field (10*5 cells/ml) exceeded the lower detection limit of fluorometr. The parametrs of the dependency indicate the viability of zygospores. The values of maximum quantum yield suggest that the zygospores were not subject to serious stress and, for the firts time, proved that the resting stages of Chlamydomonas brevispina were photosynthetically active, at least at the level of primary photochemical reactions in the photosystem 2.

In situ měření fluorescence chlorofylu u Chlamydomonas brevispina, jako odezva k extrémním podmínkám v sněžných polích. Potvrzení doměnky, že jsou schopná fotosyntetizovat i klidová stádia Chlamydomonas brevispina.
Permanent Link: http://hdl.handle.net/11104/0116586