| BARTÁK, Miloš, Peter VÁCZI, Josef HÁJEK a Jerzy SMYKLA. Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans. Polar Biology. Berlin / Heidelberg: Springer, roč. 31, č. 1, s. 47-51. ISSN 0722-4060. 2007. |
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@article{728344,
author = {Barták, Miloš and Váczi, Peter and Hájek, Josef and Smykla, Jerzy},
article_location = {Berlin / Heidelberg},
article_number = {1},
keywords = {Chlorophyll fluorescence imaging; Extreme temperature; Freezing; Non-photochemical quenching},
language = {eng},
issn = {0722-4060},
journal = {Polar Biology},
title = {Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans},
url = {http://www.springer.com/dal/home?SGWID=1-102-70-1045969-0&changeHeader=true&SHORTCUT=www.springer.com/journal/300},
volume = {31},
year = {2007}
}
TY - JOUR
ID - 728344
AU - Barták, Miloš - Váczi, Peter - Hájek, Josef - Smykla, Jerzy
PY - 2007
TI - Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans
JF - Polar Biology
VL - 31
IS - 1
SP - 47-51
EP - 47-51
PB - Springer
SN - 07224060
KW - Chlorophyll fluorescence imaging
KW - Extreme temperature
KW - Freezing
KW - Non-photochemical quenching
UR - http://www.springer.com/dal/home?SGWID=1-102-70-1045969-0&changeHeader=true&SHORTCUT=www.springer.com/journal/300
N2 - Temperature response curves of chlorophyll a fluorescence parameters were used to assess minimum subzero 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 minus20 to plus10 degC by a fluorometric imaging system. For potential (F V/F M) and actual (Phi II) quantum yields of photochemical processes the minimum temperature was found to be between minus10 and minus20 degC. Nonphotochemical quenching (NPQ) of absorbed excitation energy increased with temperature drop reaching maximum NPQ at minus15 degC. Image analysis revealed intrathalline heterogeneity of chlorophyll a fluorescence parameters with temperature drop. Temperature response of Phi II exhibited an S curve with pronounced intrathalline differences in X. elegans. The same relation was linear with only limited intrathalline difference in U. antarctica. The results showed that Antarctic lichen species were well adapted to subzero temperatures and capable of performing primary photosynthesis at minus15 degC.
ER -
BARTÁK, Miloš, Peter VÁCZI, Josef HÁJEK a Jerzy SMYKLA. Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans. \textit{Polar Biology}. Berlin / Heidelberg: Springer, roč.~31, č.~1, s.~47-51. ISSN~0722-4060. 2007.
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