Detailed Information on Publication Record
2012
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II
BARTÁK, Miloš, Josef HÁJEK and Petra OČENÁŠOVÁBasic information
Original name
Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II
Name in Czech
Fotoinhibice fotosyntézy antarktického lišejníku Usnea antarctica. I. Změny ve funkci fotosystému II vyvolané intenzitou a délkou osvětlení.
Authors
BARTÁK, Miloš (203 Czech Republic, guarantor, belonging to the institution), Josef HÁJEK (203 Czech Republic, belonging to the institution) and Petra OČENÁŠOVÁ (703 Slovakia)
Edition
Czech Polar Reports, Brno, Masaryk University, 2012, 1805-0689
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10600 1.6 Biological sciences
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/00216224:14310/12:00061543
Organization unit
Faculty of Science
Keywords (in Czech)
fluorescence chlorofylu; vysoká ozářenost; potenciální kvantový výtěžek; effektivní kvantový výtěžek
Keywords in English
chlorophyll fluorescence; high light; potential quantum yield; effective
Tags
International impact, Reviewed
Změněno: 28/10/2012 16:15, prof. Ing. Miloš Barták, CSc.
V originále
The paper deals with the differences in sensitivity of Antarctic lichen to photoinhibition. Thalli of Usnea antarctica were collected at the James Ross Island, Antarctica (57 deg 52 57 W, 63 deg 48 02 S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to 2 high light treatments: short-term (30 min), and long-term (6 h). In short-term treatment, the sample were exposed to 1000 and 2000 micromol m-2 s-1 of photosynthetically active radiation (PAR). In long-term experiment, PAR of 300, 600, and 1000 micromol m-2 s-1 were used. Photosynthetic efficiency of U.antarctica thalli was monitored by chlorophyll fluorescence parameters, potential (FV/FM) and actual (Phi PSII) quantum yield of photochemical processes in photosystem II in particular. In short-term treatments, the F0, FV and FM signals, as well as the values of FV/FM, and Phi PSII showed light-induced decrease, however substantial recovery after consequent 30 min. in dark. Longer exposition (60 min) to high light led to more pronounced decrease in chlorophyll fluorescence than after 30 min treatment, however dark recovery was faster in the thalli treated before for longer time (60 min). Long-term treatment by high light caused gradual decrease in FV/FM and Phi PSII with the time of exposition. The extent of the decrease was found light dose-dependent. The time course was biphasic for FV/FM but not for Phi PSII. The study showed that wet thalli of Usnea antarctica had high capacity of photoprotective mechanisms to cope well either with short- or long-term high light stress.
In Czech
Článek se zabývá rozdíly v citlivosti antarktických lišejníků na fotoinhibici. Stélky Usnea Antarktidy byly odebrány na Ostrově Jamese Rosse v Antarktidě (57 stupňů 52 57 W, 63 stupňů 48 02 S) a přeneseny v suchém stavu do ČR. Po ovlhčení v laboratoři byly vystaveny krátkodobé (30 min) a dlouhodobé (6 h) fotoinhibici. V krátkodobém experimentu byly vzorky se vystaveny 1000 a 2000 micromol m-2 s-1 fotosynteticky aktivního záření (PAR). Při dlouhodobém experimentu, PAR 300, 600, a 1000 micromol m-2 s-1 byly použity. Fotosyntetická účinnost U.antarctica stélek byla sledována podle parametrů fluorescence chlorofylu, potenciální (FV / FM) a efektivní (Phi PSII) kvantový výtěžek fotochemických procesů v fotosystému II.
Links
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