Visualized photosynthetic characteristics of the lichen
Xanthoria elegans related to daily courses of light,
temperature and hydration: a field study from Galindez Island,
maritime Antarctica.

J 2005

Visualized photosynthetic characteristics of the lichen Xanthoria elegans related to daily courses of light, temperature and hydration: a field study from Galindez Island, maritime Antarctica.

BARTÁK, Miloš, Jan GLOSER a Josef HÁJEK

Základní údaje

Originální název

Visualized photosynthetic characteristics of the lichen Xanthoria elegans related to daily courses of light, temperature and hydration: a field study from Galindez Island, maritime Antarctica.

Název česky

Vizualizované fotosyntetické charakteristiky liejníku Xanthoria elegans ve vztahu k denním chodm záení, teploty a vlhkosti: terénní studie z ostrova Galindez, pímoská Antarktida.

Autoři

BARTÁK, Miloš (203 Česká republika, garant), Jan GLOSER (203 Česká republika) a Josef HÁJEK (203 Česká republika)

Vydání

The Lichenologist, Academic Press, 2005, 0024-2829

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Antarktida

Utajení

není předmětem státního či obchodního tajemství

Odkazy

available at the Lichenologist web page:

Impakt faktor

Impact factor: 0.738

Kód RIV

RIV/00216224:14310/05:00013939

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000232277100007

Klíčová slova anglicky

chlorophyll fluorescence imaging; dehydration; photosynthesis; quantum yield of PS II

Štítky

chlorophyll fluorescence imaging, dehydration, photosynthesis

Změněno: 24. 6. 2009 11:02, prof. Ing. Miloš Barták, CSc.

Anotace

ORIG CZ

V originále

Diurnal courses of photosystem II (PS II) activity of Xanthoria elegans were continuously monitored using a novel technique of chlorophyll fluorescence imaging in the field (maritime Antarctica) over a period of 7 days. The lichen specimens grew on stone surfaces in a North-facing coastal area of Galindez Island (Argentine Islands). A portable fluorometer FluorCam equipped with a CCD camera and image analysis software was placed over a thallus so that false color images of FV/FM and quantum yield of photochemical processes in PS II (śII) distribution over the thallus could be taken in the course of a day. Simultaneously, microclimatic parameters of the habitat were recorded: air and thallus temperature, relative air humidity, PAR (photosynthetically active radiation) and global radiation. Photosynthetic processes in X. elegans were activated by rainfall or water from melting snow. After thallus hydration, FV/FM and śII gradually decreased from their maximal values due to evaporation and progressive loss of water from the thallus. Chlorophyll fluorescence imaging showed that the thallus dehydration started from margins and moved towards central thicker thallus parts that exhibited higher activity of PS II than margins throughout a day. The rate of inhibition of photosynthetic processes in PS II was faster in marginal than in central thallus parts. Dependence of śII on thallus water potential (WP) was investigated during gradual dehydration under laboratory conditions. After decrease of WP form zero to ĄV7 MPa, X. elegans exhibited only 13.8 % decrease in śII from its maximal value. Within the range of WP of from ĄV8 to ĄV20 MPa, śII decrease was more rapid reaching critical point (śII = 0) at WP about ĄV25 MPa. Chlorophyll fluorescence imaging and WP measurements documented that X. elegans is capable to maintain detectable photosynthetic activity even at extremely low WP. Based on our microclimatological data, X. elegans may be photosynthetically active under field conditions for several hours after being wetted from rain or snowfall. It is suggested that chlorophyll fluorescence imaging is a powerfull technique, transferable to field conditions and capable to visualize heterogeneity of photosyntetic processes over a lichen thallus subjected to periodic dehydration.

Česky

Po dobu 7 dnu byly v terennich podminkach detailn monitorovany denni; chody aktivity fotosystemu II (PS II) liejniku Xanthoria elegans za pouziti noveho metodickeho pristupu chlorophyll fluorescence imaging, a to v oblasti ostrova Galindez,primorska Antarktida. Dynamika aktivity PS II byla sledovana v zavislosti na soubezne zaznamenavanych chodech globalni a fotosynteticky aktivni radiace, teploty stelky a vlhkosti vzduchu. Dehydrace byla shledana klicovym faktorem limitace fotosynteticke aktivity Xanthoria elegans.

Návaznosti

MSM 143100007, záměr

Název: Ekologie pobřežní antarktické vegetační oázy

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Ekologie pobřežní antarktické vegetační oázy

Citovat

BARTÁK, Miloš, Jan GLOSER a Josef HÁJEK. Visualized photosynthetic characteristics of the lichen Xanthoria elegans related to daily courses of light, temperature and hydration: a field study from Galindez Island, maritime Antarctica. The Lichenologist. Academic Press, 2005, roč. 37, č. 5, s. 433-443. ISSN 0024-2829.

@article{577903,
   author = {Barták, Miloš and Gloser, Jan and Hájek, Josef},
   article_number = {5},
   keywords = {chlorophyll fluorescence imaging; dehydration; photosynthesis; quantum yield of PS II},
   language = {eng},
   issn = {0024-2829},
   journal = {The Lichenologist},
   title = {Visualized photosynthetic characteristics of the lichen Xanthoria elegans related to daily courses of light, temperature and hydration: a field study from Galindez Island, maritime Antarctica.},
   url = {http://journals.cambridge.org/action/displayIssue?jid=LIC&volumeId=37&issueId=05},
   volume = {37},
   year = {2005}
}

TY  - JOUR
ID  - 577903
AU  - Barták, Miloš - Gloser, Jan - Hájek, Josef
PY  - 2005
TI  - Visualized photosynthetic characteristics of the lichen Xanthoria elegans related to daily courses of light, temperature and hydration: a field study from Galindez Island, maritime Antarctica.
JF  - The Lichenologist
VL  - 37
IS  - 5
SP  - 433-443
EP  - 433-443
PB  - Academic Press
SN  - 00242829
KW  - chlorophyll fluorescence imaging
KW  - dehydration
KW  - photosynthesis
KW  - quantum yield of PS II
UR  - http://journals.cambridge.org/action/displayIssue?jid=LIC&volumeId=37&issueId=05
N2  - Diurnal courses of photosystem II (PS II) activity of Xanthoria elegans were continuously monitored using a novel technique of chlorophyll fluorescence imaging in the field (maritime Antarctica) over a period of 7 days. The lichen specimens grew on stone surfaces in a North-facing coastal area of Galindez Island (Argentine Islands). A portable fluorometer FluorCam equipped with a CCD camera and image analysis software was placed over a thallus so that false color images of FV/FM and quantum yield of photochemical processes in PS II (śII) distribution over the thallus could be taken in the course of a day. Simultaneously, microclimatic parameters of the habitat were recorded: air and thallus temperature, relative air humidity, PAR (photosynthetically active radiation) and global radiation. Photosynthetic processes in X. elegans were activated by rainfall or water from melting snow. After thallus hydration, FV/FM and śII gradually decreased from their maximal values due to evaporation and progressive loss of water from the thallus. Chlorophyll fluorescence imaging showed that the thallus dehydration started from margins and moved towards central thicker thallus parts that exhibited higher activity of PS II than margins throughout a day. The rate of inhibition of photosynthetic processes in PS II was faster in marginal than in central thallus parts. Dependence of śII on thallus water potential (WP) was investigated during gradual dehydration under laboratory conditions. After decrease of WP form zero to ĄV7 MPa, X. elegans exhibited only 13.8 % decrease in śII from its maximal value. Within the range of WP of from ĄV8 to ĄV20 MPa, śII decrease was more rapid reaching critical point (śII = 0) at WP about ĄV25 MPa. Chlorophyll fluorescence imaging and WP measurements documented that X. elegans is capable to maintain detectable photosynthetic activity even at extremely low WP. Based on our microclimatological data, X. elegans may be photosynthetically active under field conditions for several hours after being wetted from rain or snowfall. It is suggested that chlorophyll fluorescence imaging is a powerfull technique, transferable to field conditions and capable to visualize heterogeneity of photosyntetic processes over a lichen thallus subjected to periodic dehydration.
ER  -

BARTÁK, Miloš, Jan GLOSER a Josef HÁJEK. Visualized photosynthetic characteristics of the lichen $<$i$>$Xanthoria elegans$<$/i$>$ related to daily courses of light, temperature and hydration: a field study from Galindez Island, maritime Antarctica. \textit{The Lichenologist}. Academic Press, 2005, roč.~37, č.~5, s.~433-443. ISSN~0024-2829.

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