2004
RELATION OF QUANTUM YIELD OF PHOTOSYSTEM II TO OXYGEN EVOLUTION RATE IN A LICHEN PHOTOBIONT TREBOUXIA ERICI
VÁCZI, Peter a Miloš BARTÁKZákladní údaje
Originální název
RELATION OF QUANTUM YIELD OF PHOTOSYSTEM II TO OXYGEN EVOLUTION RATE IN A LICHEN PHOTOBIONT TREBOUXIA ERICI
Název česky
Vztah kvantového výtěžku fotosystému II a rychlosti vývinu kyslíku u lišejníkového fotobionta Trebouxia erici
Autoři
VÁCZI, Peter (703 Slovensko) a Miloš BARTÁK (203 Česká republika, garant)
Vydání
Warszawa, Acta Physiologiae Plantarum, s. 176-176, 2004
Nakladatel
Polish Academy of Science
Další údaje
Jazyk
angličtina
Typ výsledku
Stať ve sborníku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Polsko
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 0.433
Kód RIV
RIV/00216224:14310/04:00011566
Organizační jednotka
Přírodovědecká fakulta
ISSN
UT WoS
000205415400453
Klíčová slova anglicky
quantum yield; oxygen evolution; osmotic stress; lichen photobiont; Trebouxia
Změněno: 24. 6. 2009 10:38, Mgr. Peter Váczi, Ph.D.
V originále
Introduction: Lichen photosynthesis has been studied on a thalus level quite frequently (e.g. Kappen et al., 1998). Detailed photosynthetic studies on photobiont per se are not frequent. In the study the relation between oxygen evolution rate (OER) and quantum yield of photochemical reactions in photosystem II (ÖII) was examined in lichen symbiotic alga Trebouxia erici (axenic culture) exposed to different levels of photosynthetically active radiation (PAR) affected by osmotic dehydration. Material and Methods: Stock cultures cultivated in Petri dishes on agar BBM3N medium were transferred into liquid BBM3N medium (Ahmadjian, 1993). Cultures acclimated to liquid medium for 5 days were used for a simultaneous measurement of ÖII and OER in stepwise increasing PAR (37, 66, 135, 270, and 500 ľmol m-2 s-1). For measurement, double-modulated fluorometer FL-200 (PSI, CZ) was used equipped with a cuvette with an in-built oxygen electrode OC 223-B (THETA, CZ) connected to an O2-meter OxyCorder 401 (PSI, CZ). The effect of osmotic dehydration on the OER/ÖII relationship was evaluated for Trebouxia erici cells exposed to 2,0 M sucrose (Ř = -7.4 MPa) at 24 C for 60 hours. Results and Conclusions: OER and ÖII curvilinearly increased (OER) and decreased (ÖII) throughout all used irradiances. Under osmotic stress both parameters were significantly reduced. OER showed its maximum (1,2 ľmol l-1 s-1) at about 130 ľmol m-2 s -1. In non-stressed (control) culture, the ÖII to OER relation was linear. In osmotically-stressed culture, however, the relation was curvilinear due to reduced OER values in the irradiance above 200 ľmol m-2 s-1. The relation of ÖII and OER in increasing irradiance denote linear dependency in control, however, in an osmotically-stressed variant, the relation represents curvilinear dependency. In conclusion, under osmotic stress, photochemical linear electron transport chain is less limited than biochemical photosynthetic reactions of Trebouxia erici. References: Ahmadjian V. 1993. The Lichen Symbiosis. John Wiley & Sons, Inc., New York ed., 264 pp. Kappen L, Schroeter B, Green TGA and Seppelt RD. 1998. Chlorophyll a Fluorescence and CO2 Exchange of Umbilicaria Aprina Under Extreme Light Stress in the Cold. Oecologia 113(3): 325-331.
Česky
RELATION OF QUANTUM YIELD OF PHOTOSYSTEM II TO OXYGEN EVOLUTION RATE IN A LICHEN PHOTOBIONT TREBOUXIA ERICI
Návaznosti
GA522/03/0754, projekt VaV |
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