Photoinhibition of photosynthesis in Antarctic lichen Usnea
antarctica. II. Analysis of non-photochemical quenching
mechanisms activated by low to medium light doses

J 2014

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses

OČENÁŠOVÁ, Petra, Miloš BARTÁK a Josef HÁJEK

Základní údaje

Originální název

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses

Autoři

OČENÁŠOVÁ, Petra (703 Slovensko, domácí), Miloš BARTÁK (203 Česká republika, garant) a Josef HÁJEK (203 Česká republika)

Vydání

Czech Polar Reports, Masarykova univerzita, 2014, 1805-0689

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Kód RIV

RIV/00216224:14310/14:00076392

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

photoinhibitory quenching; state1-2 transition quenching; energy-dependent quenching

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 27. 4. 2015 15:46, Ing. Andrea Mikešková

Anotace

V originále

The paper focus sensitivity of an Antarctic lichen Usnea antarctica to photoinhibition studied under controlled laboratory conditions. Main emphasis was given to the analysis of quenching mechanisms, i.e. deexcitation pathways of absorbed light energy exploited in non-photochemical processes. Thalli of U. antarctica were collected at the James Ross Island, Antarctica (57°52´57´´ W, 63°48´02´´ S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to medium light intensities (300, 600 and 1000 micromol m-2 s-1 of photosynthetically active radiation) for 6 h. Before and during photoinhibitory treatments, chlorophyll fluorescence parameters, photoinhibitory (qI), state 1-2 transition (qT), and energy-dependent quenching (qE) in particular were measured to evaluate dose- and time-dependent changes in these parameters. The results showed that among the components forming non-photochemical quenching (qN), qI contributes to the largest extent to qN, while qE and qT contribute less. This finding differs from our earlier studies made in a short term-, and high light-treated U. antarctica that found qE together with qI is the most important part of non-photochemical quenching. Possible explanation is that photoinhibition in PS II in U. ant-arctica, when induced by low to medium light, activates qE to only limited extend and for a relatively short time (tens of minutes). With prolonged high light treatment lasting several hours, qE tends to be reduced to the values close to zero and qI then forms a major part of qN.

Návaznosti

LM2010009, projekt VaV

Název: Projekt CzechPolar - České polární stanice: Stavba a operační náklady

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Czech Polar - České polární stanice: Stavba a operační náklady

Citovat

OČENÁŠOVÁ, Petra, Miloš BARTÁK a Josef HÁJEK. Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses. Czech Polar Reports. Masarykova univerzita, 2014, roč. 4, č. 1, s. 90-99. ISSN 1805-0689.

@article{1197220,
   author = {Očenášová, Petra and Barták, Miloš and Hájek, Josef},
   article_number = {1},
   keywords = {photoinhibitory quenching; state1-2 transition quenching; energy-dependent quenching},
   language = {eng},
   issn = {1805-0689},
   journal = {Czech Polar Reports},
   title = {Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses},
   url = {http://www.sci.muni.cz/CPR/7cislo/Ocenasova-web.pdf},
   volume = {4},
   year = {2014}
}

TY  - JOUR
ID  - 1197220
AU  - Očenášová, Petra - Barták, Miloš - Hájek, Josef
PY  - 2014
TI  - Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses
JF  - Czech Polar Reports
VL  - 4
IS  - 1
SP  - 90-99
EP  - 90-99
PB  - Masarykova univerzita
SN  - 18050689
KW  - photoinhibitory quenching
KW  - state1-2 transition quenching
KW  - energy-dependent quenching
UR  - http://www.sci.muni.cz/CPR/7cislo/Ocenasova-web.pdf
N2  - The paper focus sensitivity of an Antarctic lichen Usnea antarctica to photoinhibition studied under controlled laboratory conditions. Main emphasis was given to the analysis of quenching mechanisms, i.e. deexcitation pathways of absorbed light energy exploited in non-photochemical processes. Thalli of U. antarctica were collected at the James Ross Island, Antarctica (57°52´57´´ W, 63°48´02´´ S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to medium light intensities (300, 600 and 1000 micromol m-2 s-1 of photosynthetically active radiation) for 6 h. Before and during photoinhibitory treatments, chlorophyll fluorescence parameters, photoinhibitory (qI), state 1-2 transition (qT), and energy-dependent quenching (qE) in particular were measured to evaluate dose- and time-dependent changes in these parameters. The results showed that among the components forming non-photochemical quenching (qN), qI contributes to the largest extent to qN, while qE and qT contribute less. This finding differs from our earlier studies made in a short term-, and high light-treated U. antarctica that found qE together with qI is the most important part of non-photochemical quenching. Possible explanation is that photoinhibition in PS II in U. ant-arctica, when induced by low to medium light, activates qE to only limited extend and for a relatively short time (tens of minutes). With prolonged high light treatment lasting several hours, qE tends to be reduced to the values close to zero and qI then forms a major part of qN.
ER  -

OČENÁŠOVÁ, Petra, Miloš BARTÁK a Josef HÁJEK. Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses. \textit{Czech Polar Reports}. Masarykova univerzita, 2014, roč.~4, č.~1, s.~90-99. ISSN~1805-0689.

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