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Statements

Subject Item
n2:RIV%2F00216224%3A14310%2F03%3A00008618%21RIV08-MSM-14310___
rdf:type
n7:Vysledek skos:Concept
dcterms:description
Two lichen species collected in maritime Antarctica (King George Island) were exposed under laboratory conditions to excess irradiance to evaluate the response of photosystem 2 (PS2). The response was measured on fully hydrated lichen thalli at 5 oC by means of a modulated fluorometer using chlorophyll (Chl) fluorescence induction curve supplemented with analysis of quenching mechanisms. Chl fluorescence parameters [i.e. ratio of variable to maximum Chl fluorescence (FV/FM), quantum yield of PS2 photochemical reactions (?2), quenching coefficients] were evaluated before and several times after exposition to high irradiance in order to characterise the extent of photoinhibition, fast and slow phase of recovery. Strong irradiance (2 000 ľmol m-2 s-1) caused high degree of photoinhibition, particularly higher in fruticose (Usnea antarctica) than in foliose (Umbilicaria decussata) lichen species. Fast phase of recovery from photoinhibition, corresponding to regulatory mechanisms of PS2, was apparent in bo Two lichen species collected in maritime Antarctica (King George Island) were exposed under laboratory conditions to excess irradiance to evaluate the response of photosystem 2 (PS2). The response was measured on fully hydrated lichen thalli at 5 oC by means of a modulated fluorometer using chlorophyll (Chl) fluorescence induction curve supplemented with analysis of quenching mechanisms. Chl fluorescence parameters [i.e. ratio of variable to maximum Chl fluorescence (FV/FM), quantum yield of PS2 photochemical reactions (?2), quenching coefficients] were evaluated before and several times after exposition to high irradiance in order to characterise the extent of photoinhibition, fast and slow phase of recovery. Strong irradiance (2 000 ľmol m-2 s-1) caused high degree of photoinhibition, particularly higher in fruticose (Usnea antarctica) than in foliose (Umbilicaria decussata) lichen species. Fast phase of recovery from photoinhibition, corresponding to regulatory mechanisms of PS2, was apparent in bo Two lichen species collected in maritime Antarctica (King George Island) were exposed under laboratory conditions to excess irradiance to evaluate the response of photosystem 2 (PS2). The response was measured on fully hydrated lichen thalli at 5 oC by means of a modulated fluorometer using chlorophyll (Chl) fluorescence induction curve supplemented with analysis of quenching mechanisms. Chl fluorescence parameters [i.e. ratio of variable to maximum Chl fluorescence (FV/FM), quantum yield of PS2 photochemical reactions (?2), quenching coefficients] were evaluated before and several times after exposition to high irradiance in order to characterise the extent of photoinhibition, fast and slow phase of recovery. Strong irradiance (2 000 ľmol m-2 s-1) caused high degree of photoinhibition, particularly higher in fruticose (Usnea antarctica) than in foliose (Umbilicaria decussata) lichen species. Fast phase of recovery from photoinhibition, corresponding to regulatory mechanisms of PS2, was apparent in bo
dcterms:title
Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species
skos:prefLabel
Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species
skos:notation
RIV/00216224:14310/03:00008618!RIV08-MSM-14310___
n3:strany
497-504
n3:aktivita
n9:P n9:Z
n3:aktivity
P(GA522/03/0754), Z(MSM 143100007)
n3:cisloPeriodika
4
n3:dodaniDat
n11:2008
n3:domaciTvurceVysledku
n18:2883155 n18:9431217 n18:8833346
n3:druhVysledku
n10:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
626720
n3:idVysledku
RIV/00216224:14310/03:00008618
n3:jazykVysledku
n17:cze
n3:klicovaSlova
chlorophyll fluorescence; low temperature; photoinhibition; photosynthesis; non-photochemical quenching; recovery.
n3:klicoveSlovo
n8:chlorophyll%20fluorescence n8:low%20temperature n8:photoinhibition n8:non-photochemical%20quenching n8:photosynthesis n8:recovery.
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[3F5D6885EB8D]
n3:nazevZdroje
Photosynthetica
n3:obor
n4:EF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n14:GA522%2F03%2F0754
n3:rokUplatneniVysledku
n11:2003
n3:svazekPeriodika
41
n3:tvurceVysledku
Cempírková, Hana Hájek, Josef Barták, Miloš
n3:zamer
n12:MSM%20143100007
s:issn
0300-3604
s:numberOfPages
8
n19:organizacniJednotka
14310