Long-term fluorometric measurements of photosynthetic processes
in Antarctic moss Bryum sp. during austral summer season

J 2014

Long-term fluorometric measurements of photosynthetic processes in Antarctic moss Bryum sp. during austral summer season

BARTÁK, Miloš a Peter VÁCZI

Základní údaje

Originální název

Long-term fluorometric measurements of photosynthetic processes in Antarctic moss Bryum sp. during austral summer season

Název česky

Dlouhodobé fluorometrické měření fotosyntetických procesů antarktického mechu Bryum sp. v průběhu letního období

Autoři

BARTÁK, Miloš (203 Česká republika, garant, domácí) a Peter VÁCZI (703 Slovensko, domácí)

Vydání

Czech Polar Reports, Brno, 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

free full text copy downloadable here (Czech Polar Reports)

Kód RIV

RIV/00216224:14310/14:00076391

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova česky

Antarktida; denní chody; efektivní kvantový výtěžek; elektronový transport; fluorescence chlorofylu; ostrov Jamese Rosse

Klíčová slova anglicky

Antarctics; daily courses; effective quantum yield; electron transport rate;chlorophyll fluorescence; James Ross Island

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 27. 4. 2015 15:45, Ing. Andrea Mikešková

Anotace

V originále

Photosynthetic activity pattern of Bryum sp. was monitored for 28 days using a chlorophyll a fluorescence measuring system installed in the field. For the study, longterm research plot, a moss-dominated vegetaiton oasis at seashore located close to the J.G. Mendel station (James Ross Island, Antarctica) was selected. In this study, two measuring sites were used: (1) control plot with moss cover and (2) moss located inside open top chamber (OTC). At both sites, effective quantum yield of photosynthetic processes in photosyntem II (Yield PSII) was measured and relative photosynthetic electron transport rate (ETRrel) evaluated each 15 min. Simultaneously, microclimate of the sites was measured including air and moss surface temperature, relative air humidity and photosynthetically active radiation. The length of photosyntetically active period depended mainly on hydration of moss cushion. Water availability, however, was not limiting in the measuring period (Jan 8 - Feb 18, 2009), because the sites were well suplied by melt water from neighbouring snowfield. Thus, daily courses of ETRrel were dependent on incident PAR. On sunny days, ETRrel reached values over 400. Inhibition of primary photosynthetic processes due to below-zero temperature and resulting freezing of moss cushions appeared two times within the measuring periods thanks to rapid decreases in air temperature. The effect of low air temperature on ETRrel was less apparent in OTC site since moss cushion freezing period was shorter and less pronounced than in control site thanks to OTC-induced shift in air temperature. For future photosynthetic studies in Antarctic mosses, simultaneous measurements of gas exchange- and chlorophyll fluorescence-related parameters is recommended so that the effects of particular limiting factors for photosynthesis and photosynthetic productivity can be distinguished and evaluated.

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

BARTÁK, Miloš a Peter VÁCZI. Long-term fluorometric measurements of photosynthetic processes in Antarctic moss Bryum sp. during austral summer season. Czech Polar Reports. Brno: Masarykova univerzita, 2014, roč. 4, č. 1, s. 63-72. ISSN 1805-0689.

@article{1197216,
   author = {Barták, Miloš and Váczi, Peter},
   article_location = {Brno},
   article_number = {1},
   keywords = {Antarctics; daily courses; effective quantum yield; electron transport rate;chlorophyll fluorescence; James Ross Island},
   language = {eng},
   issn = {1805-0689},
   journal = {Czech Polar Reports},
   title = {Long-term fluorometric measurements of photosynthetic processes in Antarctic moss Bryum sp. during austral summer season},
   url = {http://www.sci.muni.cz/CPR/7cislo/Bartak-web.pdf},
   volume = {4},
   year = {2014}
}

TY  - JOUR
ID  - 1197216
AU  - Barták, Miloš - Váczi, Peter
PY  - 2014
TI  - Long-term fluorometric measurements of photosynthetic processes in Antarctic moss Bryum sp. during austral summer season
JF  - Czech Polar Reports
VL  - 4
IS  - 1
SP  - 63-72
EP  - 63-72
PB  - Masarykova univerzita
SN  - 18050689
KW  - Antarctics
KW  - daily courses
KW  - effective quantum yield
KW  - electron transport rate;chlorophyll fluorescence
KW  - James Ross Island
UR  - http://www.sci.muni.cz/CPR/7cislo/Bartak-web.pdf
L2  - http://www.sci.muni.cz/CPR/7cislo/Bartak-web.pdf
N2  - Photosynthetic activity pattern of Bryum sp. was monitored for 28 days using a chlorophyll a fluorescence measuring system installed in the field. For the study, longterm research plot, a moss-dominated vegetaiton oasis at seashore located close to the J.G. Mendel station (James Ross Island, Antarctica) was selected. In this study, two measuring sites were used: (1) control plot with moss cover and (2) moss located inside open top chamber (OTC). At both sites, effective quantum yield of photosynthetic processes in photosyntem II (Yield PSII) was measured and relative photosynthetic electron transport rate (ETRrel) evaluated each 15 min. Simultaneously, microclimate of the sites was measured including air and moss surface temperature, relative air humidity and photosynthetically active radiation. The length of photosyntetically active period depended mainly on hydration of moss cushion. Water availability, however, was not limiting in the measuring period (Jan 8 - Feb 18, 2009), because the sites were well suplied by melt water from neighbouring snowfield. Thus, daily courses of ETRrel were dependent on incident PAR. On sunny days, ETRrel reached values over 400. Inhibition of primary photosynthetic processes due to below-zero temperature and resulting freezing of moss cushions appeared two times within the measuring periods thanks to rapid decreases in air temperature. The effect of low air temperature on ETRrel was less apparent in OTC site since moss cushion freezing period was shorter and less pronounced than in control site thanks to OTC-induced shift in air temperature. For future photosynthetic studies in Antarctic mosses, simultaneous measurements of gas exchange- and chlorophyll fluorescence-related parameters is recommended so that the effects of particular limiting factors for photosynthesis and photosynthetic productivity can be distinguished and evaluated.
ER  -

BARTÁK, Miloš a Peter VÁCZI. Long-term fluorometric measurements of photosynthetic processes in Antarctic moss Bryum sp. during austral summer season. \textit{Czech Polar Reports}. Brno: Masarykova univerzita, 2014, roč.~4, č.~1, s.~63-72. ISSN~1805-0689.

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