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 and Peter VÁCZI

Basic information

Original name

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

Name in Czech

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

Authors

BARTÁK, Miloš (203 Czech Republic, guarantor, belonging to the institution) and Peter VÁCZI (703 Slovakia, belonging to the institution)

Edition

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

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10600 1.6 Biological sciences

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

free full text copy downloadable here (Czech Polar Reports)

RIV identification code

RIV/00216224:14310/14:00076391

Organization unit

Faculty of Science

Keywords (in Czech)

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

Keywords in English

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

Abstract

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.

Links

LM2010009, research and development project

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

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

BARTÁK, Miloš and 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, vol. 4, No 1, p. 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 and 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, vol.~4, No~1, p.~63-72. ISSN~1805-0689.

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