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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F13%3A33144189%21RIV14-MSM-15310___
rdf:type
skos:Concept n8:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.jtbi.2013.06.028
dcterms:description
Photosystem I (PSI) is generally assumed not to emit variable chlorophyll (Chl) fluorescence during light-induced Chl fluorescence rise (FLR), which occurs in a time window upto 1 s under high intensity of excitation light. Therefore, the measured FLR and its changes caused by any treatment are usually interpreted by changes only in photosystem II (PSII) fluorescence. But examples can be found in the literature indicating that PSI can emit variable Chl fluorescence at least under certain conditions. As it is impossible to determine the PSI variable Chl fluorescence in vivo solely based on experiments, a way to explore a possible existence of PSI variable Chl fluorescence is to construct a mathematical model of reactions occurring inside and around PSI and to simulate a hypothetical FLR. Based on our present knowledge about the function of PSI, a detailed model describing reactions occurring inside and around PSI was constructed and used for the simulation of FLR originating exclusively in PSI. These simulations show that PSI, in principle, can emit variable Chl fluorescence. Several in silico experiments are performed showing the effect of particular reactions on the FLR. The theoretical PSI variable Chl fluorescence is also compared with theoretical variable fluorescence originating in PSII simulated on the basis of an improved model of PSII showing that variable fluorescence originating in PSI can be as high as 8?17%of overall maximal fluorescence signal originating in both photosystems. The overall FLR obtained as a sum of the simulated FLRs originating in PSI and PSII shows a peak which is similar to an H-peak measured with certain type of samples. We suggest that new experiments be planned to prove the new concept of variable PSI fluorescence. Photosystem I (PSI) is generally assumed not to emit variable chlorophyll (Chl) fluorescence during light-induced Chl fluorescence rise (FLR), which occurs in a time window upto 1 s under high intensity of excitation light. Therefore, the measured FLR and its changes caused by any treatment are usually interpreted by changes only in photosystem II (PSII) fluorescence. But examples can be found in the literature indicating that PSI can emit variable Chl fluorescence at least under certain conditions. As it is impossible to determine the PSI variable Chl fluorescence in vivo solely based on experiments, a way to explore a possible existence of PSI variable Chl fluorescence is to construct a mathematical model of reactions occurring inside and around PSI and to simulate a hypothetical FLR. Based on our present knowledge about the function of PSI, a detailed model describing reactions occurring inside and around PSI was constructed and used for the simulation of FLR originating exclusively in PSI. These simulations show that PSI, in principle, can emit variable Chl fluorescence. Several in silico experiments are performed showing the effect of particular reactions on the FLR. The theoretical PSI variable Chl fluorescence is also compared with theoretical variable fluorescence originating in PSII simulated on the basis of an improved model of PSII showing that variable fluorescence originating in PSI can be as high as 8?17%of overall maximal fluorescence signal originating in both photosystems. The overall FLR obtained as a sum of the simulated FLRs originating in PSI and PSII shows a peak which is similar to an H-peak measured with certain type of samples. We suggest that new experiments be planned to prove the new concept of variable PSI fluorescence.
dcterms:title
Simulations show that a small part of variable chlorophyll a fluorescence originates in photosystem I and contributes to overall fluorescence rise. Simulations show that a small part of variable chlorophyll a fluorescence originates in photosystem I and contributes to overall fluorescence rise.
skos:prefLabel
Simulations show that a small part of variable chlorophyll a fluorescence originates in photosystem I and contributes to overall fluorescence rise. Simulations show that a small part of variable chlorophyll a fluorescence originates in photosystem I and contributes to overall fluorescence rise.
skos:notation
RIV/61989592:15310/13:33144189!RIV14-MSM-15310___
n8:predkladatel
n9:orjk%3A15310
n5:aktivita
n14:P
n5:aktivity
P(ED0007/01/01)
n5:cisloPeriodika
OCT 2013
n5:dodaniDat
n11:2014
n5:domaciTvurceVysledku
n6:1274899
n5:druhVysledku
n17:J
n5:duvernostUdaju
n20:S
n5:entitaPredkladatele
n16:predkladatel
n5:idSjednocenehoVysledku
105289
n5:idVysledku
RIV/61989592:15310/13:33144189
n5:jazykVysledku
n12:eng
n5:klicovaSlova
chlorophyll fluorescence induction, model, photosystem I, theory, variable fluorescence
n5:klicoveSlovo
n7:model n7:chlorophyll%20fluorescence%20induction n7:variable%20fluorescence n7:theory n7:photosystem%20I
n5:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n5:kontrolniKodProRIV
[0A55E144A845]
n5:nazevZdroje
Journal of Theoretical Biology
n5:obor
n15:BO
n5:pocetDomacichTvurcuVysledku
1
n5:pocetTvurcuVysledku
1
n5:projekt
n13:ED0007%2F01%2F01
n5:rokUplatneniVysledku
n11:2013
n5:svazekPeriodika
335
n5:tvurceVysledku
Lazár, Dušan
n5:wos
000324447600025
s:issn
0022-5193
s:numberOfPages
16
n18:doi
10.1016/j.jtbi.2013.06.028
n21:organizacniJednotka
15310