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Statements

Subject Item
n2:RIV%2F61388971%3A_____%2F14%3A00440894%21RIV15-AV0-61388971
rdf:type
n9:Vysledek skos:Concept
dcterms:description
Lake Bonney is one of several permanently ice-covered lakes in the McMurdo Dry Valleys, Antarctica, which maintain the only year-round biological activity on the Antarctic continent. Vertically stratified populations of autotrophic microorganisms occupying the water columns are adapted to numerous extreme conditions, including very low light, hypersalinity, ultra-oligotrophy and low temperatures. In this study, we integrated molecular biology, microscopy, flow cytometry, and functional photochemical analyses of the photosynthetic communities residing in the east and west basins of dry valley Lake Bonney. Diversity and abundance of the psbA gene encoding a major protein of the photosystem II reaction center were monitored during the seasonal transition between Antarctic summer (24-h daylight) to winter (24-h darkness). Vertical trends through the photic zone in psbA abundance (DNA and mRNA) closely matched that of primary production in both lobes. Seasonal trends in psbA transcripts differed between the two lobes, with psbA expression in the west basin exhibiting a transient rise in early Fall. Last, using spectroscopic and flow cytometric analyses, we provide the first evidence that the Lake Bonney photosynthetic community is dominated by picophytoplankton that possess photosynthetic apparatus adapted to extreme shade. Lake Bonney is one of several permanently ice-covered lakes in the McMurdo Dry Valleys, Antarctica, which maintain the only year-round biological activity on the Antarctic continent. Vertically stratified populations of autotrophic microorganisms occupying the water columns are adapted to numerous extreme conditions, including very low light, hypersalinity, ultra-oligotrophy and low temperatures. In this study, we integrated molecular biology, microscopy, flow cytometry, and functional photochemical analyses of the photosynthetic communities residing in the east and west basins of dry valley Lake Bonney. Diversity and abundance of the psbA gene encoding a major protein of the photosystem II reaction center were monitored during the seasonal transition between Antarctic summer (24-h daylight) to winter (24-h darkness). Vertical trends through the photic zone in psbA abundance (DNA and mRNA) closely matched that of primary production in both lobes. Seasonal trends in psbA transcripts differed between the two lobes, with psbA expression in the west basin exhibiting a transient rise in early Fall. Last, using spectroscopic and flow cytometric analyses, we provide the first evidence that the Lake Bonney photosynthetic community is dominated by picophytoplankton that possess photosynthetic apparatus adapted to extreme shade.
dcterms:title
An integrated study of photochemical function and expression of a key photochemical gene (psbA) in photosynthetic communities of Lake Bonney (McMurdo Dry Valleys, Antarctica) An integrated study of photochemical function and expression of a key photochemical gene (psbA) in photosynthetic communities of Lake Bonney (McMurdo Dry Valleys, Antarctica)
skos:prefLabel
An integrated study of photochemical function and expression of a key photochemical gene (psbA) in photosynthetic communities of Lake Bonney (McMurdo Dry Valleys, Antarctica) An integrated study of photochemical function and expression of a key photochemical gene (psbA) in photosynthetic communities of Lake Bonney (McMurdo Dry Valleys, Antarctica)
skos:notation
RIV/61388971:_____/14:00440894!RIV15-AV0-61388971
n3:aktivita
n4:P n4:I
n3:aktivity
I, P(ED2.1.00/03.0110)
n3:cisloPeriodika
6
n3:dodaniDat
n11:2015
n3:domaciTvurceVysledku
n14:6541933 n14:9408983
n3:druhVysledku
n5:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
2517
n3:idVysledku
RIV/61388971:_____/14:00440894
n3:jazykVysledku
n7:eng
n3:klicovaSlova
photochemistry; lake Bonnney; communities
n3:klicoveSlovo
n12:photochemistry n12:lake%20Bonnney n12:communities
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[02AC4A9C03D4]
n3:nazevZdroje
FEMS Microbiology Ecology
n3:obor
n17:EE
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n8:ED2.1.00%2F03.0110
n3:rokUplatneniVysledku
n11:2014
n3:svazekPeriodika
89
n3:tvurceVysledku
Kong, W. Morgan-Kiss, R. M. Romancová, Ingrid Prášil, Ondřej Wei, L.
n3:wos
000340535200008
s:issn
0168-6496
s:numberOfPages
10