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Statements

Subject Item
n2:RIV%2F00216224%3A14310%2F07%3A00022948%21RIV10-MSM-14310___
rdf:type
skos:Concept n17:Vysledek
dcterms:description
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. 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.
dcterms:title
Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans
skos:prefLabel
Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans
skos:notation
RIV/00216224:14310/07:00022948!RIV10-MSM-14310___
n4:aktivita
n12:P
n4:aktivity
P(ME 945)
n4:cisloPeriodika
1
n4:dodaniDat
n11:2010
n4:domaciTvurceVysledku
n16:9462627 n16:9431217 n16:2883155
n4:druhVysledku
n15:J
n4:duvernostUdaju
n7:S
n4:entitaPredkladatele
n6:predkladatel
n4:idSjednocenehoVysledku
431508
n4:idVysledku
RIV/00216224:14310/07:00022948
n4:jazykVysledku
n14:eng
n4:klicovaSlova
Chlorophyll fluorescence imaging; Extreme temperature; Freezing; Non-photochemical quenching
n4:klicoveSlovo
n9:Non-photochemical%20quenching n9:Freezing n9:Chlorophyll%20fluorescence%20imaging n9:Extreme%20temperature
n4:kodStatuVydavatele
DE - Spolková republika Německo
n4:kontrolniKodProRIV
[9FCA190BE12E]
n4:nazevZdroje
Polar Biology
n4:obor
n13:EF
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
4
n4:projekt
n18:ME%20945
n4:rokUplatneniVysledku
n11:2007
n4:svazekPeriodika
31
n4:tvurceVysledku
Váczi, Peter Smykla, Jerzy Barták, Miloš Hájek, Josef
n4:wos
000251717100006
s:issn
0722-4060
s:numberOfPages
5
n8:organizacniJednotka
14310