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@article{1070674,
author = {Barták, Miloš and Hájek, Josef and Očenášová, Petra},
article_location = {Brno},
article_number = {1},
keywords = {chlorophyll fluorescence; high light; potential quantum yield; effective},
language = {eng},
issn = {1805-0689},
journal = {Czech Polar Reports},
title = {Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II},
url = {http://www.sci.muni.cz/CPR/3cislo/Ocenasova-web.pdf},
volume = {2},
year = {2012}
}
TY - JOUR
ID - 1070674
AU - Barták, Miloš - Hájek, Josef - Očenášová, Petra
PY - 2012
TI - Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II
JF - Czech Polar Reports
VL - 2
IS - 1
SP - 42-51
EP - 42-51
PB - Masaryk University
SN - 18050689
KW - chlorophyll fluorescence
KW - high light
KW - potential quantum yield
KW - effective
UR - http://www.sci.muni.cz/CPR/3cislo/Ocenasova-web.pdf
L2 - http://www.sci.muni.cz/CPR/3cislo/Ocenasova-web.pdf
N2 - 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.
ER -
BARTÁK, Miloš, Josef HÁJEK a Petra OČENÁŠOVÁ. Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II. \textit{Czech Polar Reports}. Brno: Masaryk University, roč.~2, č.~1, s.~42-51. ISSN~1805-0689. 2012.
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