Simultaneous measurements of PSII activity and thallus
temperature during linear cooling. A method to assess
interspecific differences in photosynthetic processes in
lichens from polar regions.

a 2014

Simultaneous measurements of PSII activity and thallus temperature during linear cooling. A method to assess interspecific differences in photosynthetic processes in lichens from polar regions.

HÁJEK, Josef; Peter VÁCZI; Jana HAZDROVÁ a Miloš BARTÁK

Základní údaje

Originální název

Simultaneous measurements of PSII activity and thallus temperature during linear cooling. A method to assess interspecific differences in photosynthetic processes in lichens from polar regions.

Název česky

Souběžná měření aktivity PSII a teploty stélky během lineárního ochlazování. Metoda pro posouzení mezidruhových rozdílů ve fotosyntetických procesech lišejníků z polárních oblastí

Autoři

HÁJEK, Josef; Peter VÁCZI; Jana HAZDROVÁ a Miloš BARTÁK

Vydání

Polar Ecology Conference, Ceske Budejovice, p. 56-57. 2014

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10600 1.6 Biological sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Downloadable Book of Abstracts

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/14:00076590

Organizační jednotka

Přírodovědecká fakulta

ISBN

978-80-7394-463-6

Klíčová slova česky

odolnost proti zmražení; fluorescence chlorofylu; lišejníkový fotobiont; stélka; kritická teplota

Klíčová slova anglicky

cryoresistance; chlorophyll fluorescence; thallus; lichen photobiont; critical temperature

Změněno: 25. 9. 2014 11:25, prof. Ing. Miloš Barták, CSc.

Anotace

ORIG CZ

V originále

A comparison of cryoresistance of isolated lichen photobiont and polar lichens is presented. Several species were chosen for this experiment: (1) algal cultures of Trebouxia glomerata, Trebouxia sp. (2) thalli of Usnea antarctica, Usnea aurantiaco-atra, Usnea longissima, Umbilicaria decussata, Umbilicaria cylindrica. All the samples were exposed to temperatures linearly decreasing from +20 °C to -40 °C under controlled conditions. During the experiment, sample temperature and two parameters of chlorophyll fluorescence – (1) potential (FV/FM) and (2) effective quantum yield of photochemical processes in photosystem II (YieldPSII) – were measured simultaneously. Cooling was provided by a KRYO 560-16 (PLANER, United Kingdom) device. For majority of samples, two cooling rates were used: 6 °C min-1 (fast) and 2 °C min-1 (slow) were used. The chlorophyll fluorescence was measured by a PC-linked PAM 2000 fluorometer (H. Walz, Germany). Measurements of YieldPSII were made every 30 s. For all samples, the response of FV/FM and YieldPSII to declining temperature showed an „S curve“ with critical temperatures, indicating high level of cryoresistance of the samples. In an individual sample, critical temperature for FV/FM was typically lower than for YieldPSII.

Česky

viz abstrakt v anglictine

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

HÁJEK, Josef; Peter VÁCZI; Jana HAZDROVÁ a Miloš BARTÁK. Simultaneous measurements of PSII activity and thallus temperature during linear cooling. A method to assess interspecific differences in photosynthetic processes in lichens from polar regions. In Polar Ecology Conference, Ceske Budejovice, p. 56-57. 2014. ISBN 978-80-7394-463-6.

@proceedings{1199198,
   author = {Hájek, Josef and Váczi, Peter and Hazdrová, Jana and Barták, Miloš},
   booktitle = {Polar Ecology Conference, Ceske Budejovice, p. 56-57.},
   keywords = {cryoresistance; chlorophyll fluorescence; thallus; lichen photobiont; critical temperature},
   language = {eng},
   isbn = {978-80-7394-463-6},
   title = {Simultaneous measurements of PSII activity and thallus temperature during linear cooling. A method to assess interspecific differences in photosynthetic processes in lichens from polar regions.},
   url = {http://polar.prf.jcu.cz/data/PEC2014_abstract_book_final.pdf},
   year = {2014}
}

TY  - CONF
ID  - 1199198
AU  - Hájek, Josef - Váczi, Peter - Hazdrová, Jana - Barták, Miloš
PY  - 2014
TI  - Simultaneous measurements of PSII activity and thallus temperature during linear cooling. A method to assess interspecific differences in photosynthetic processes in lichens from polar regions.
SN  - 9788073944636
KW  - cryoresistance
KW  - chlorophyll fluorescence
KW  - thallus
KW  - lichen photobiont
KW  - critical temperature
UR  - http://polar.prf.jcu.cz/data/PEC2014_abstract_book_final.pdf
N2  - A comparison of cryoresistance of isolated lichen photobiont and polar lichens is presented. Several species were chosen for this experiment: (1) algal cultures of Trebouxia glomerata, Trebouxia sp. (2) thalli of Usnea antarctica, Usnea aurantiaco-atra, Usnea longissima, Umbilicaria decussata, Umbilicaria cylindrica. All the samples were exposed to temperatures linearly decreasing from +20 °C to -40 °C under controlled conditions. During the experiment, sample temperature and two parameters of chlorophyll fluorescence – (1) potential (FV/FM) and (2) effective quantum yield of photochemical processes in photosystem II (YieldPSII) – were measured simultaneously. Cooling was provided by a KRYO 560-16 (PLANER, United Kingdom) device. For majority of samples, two cooling rates were used: 6 °C min-1 (fast) and 2 °C min-1 (slow) were used. The chlorophyll fluorescence was measured by a PC-linked PAM 2000 fluorometer (H. Walz, Germany). Measurements of YieldPSII were made every 30 s. For all samples, the response of FV/FM and YieldPSII to declining temperature showed an „S curve“ with critical temperatures, indicating high level of cryoresistance of the samples. In an individual sample, critical temperature for FV/FM was typically lower than for YieldPSII.
ER  -

HÁJEK, Josef; Peter VÁCZI; Jana HAZDROVÁ a Miloš BARTÁK. Simultaneous measurements of PSII activity and thallus temperature during linear cooling. A method to assess interspecific differences in photosynthetic processes in lichens from polar regions. In \textit{Polar Ecology Conference, Ceske Budejovice, p. 56-57.}. 2014. ISBN~978-80-7394-463-6.

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