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- W2605061398 abstract "Introduction: Chlorophyll fluorescence induction (FI) measuredwith photosynthetic samples (higher plants, algae,cyanobacteria) within the first seconds of intensive lightexcitation (thousands of mmol photons m-2 s -1) revealscharacteristic O-J-I-P transient. Parameters calculated fromthe transient are often used for detection of plant stress onthe photosystem (PS) level (e.g. Strasser et al., 2000). Weinvestigated the FI in lichen thalli and isolated lichenphotobionts. Material and Methods: Thalli of foliose lichenspecies Lasallia pustulata and Umbilicaria hirsuta werecollected in the field. The lichen photobiont strain, Trebouxiaerici Ahmadjian, as a representative of green alga genuspresented in both lichen species, was cultured in BBM3N mediumat 20 C at the regime 16h light/8h dark. FI was measured usingPlant Efficiency Analyser (Hansatech, Norfolk, UK). Intensityof red exciting light was about 6000 ľmol photons m-2 s-1.Results and Conclusions: FI of predarkened lichen speciesrevealed the P step splitted into two distinct steps appearingat 200 ms and 1-2 s. Similar steps in FI (called H and G,respectively) have been reported for some foraminifers(Tsimilli-Michael et al., 1999). In lichens, the G step wasfound markedly and reversibly reduced after photoinhibitorytreatment (1500 mmol photons m-2 s -1, PAR; 50 min; 5 C) whilerelative heights of the other steps in FI were retained. The FImeasured with the photobiont suspension revealed again theO-J-I-H-G transient. Whereas the H and G steps remaineddiscriminated in FI in the presence of methylviologen, anelectron acceptor behind PSI, they were merged in the presenceof artificial PSII electron acceptors. References: Strasser RJ,Srivastava A, Tsimilli-Michael M. 2000. The fluorescencetransient as a tool to characterize and screen photosyntheticsamples. In: Yunus M, Pathre U, Mohanty P, eds. Probingphotosynthesis: mechanisms, regulation and adaptation. LondonUK: Taylor & Francis, 445-483. Tsimilli-Michael M, Pecheux M,Strasser RJ. 1999. Light and heat stress adaptation of thesymbionts of temperate and coral reef foraminifers probed inhospite by the chlorophyll a fluorescence kinetics. Z.Naturforsch. 54c: 671-680. Acknowledgements: Supported by GACR, grant No. 522/03/0754)." @default.
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- W2605061398 date "2004-01-01" @default.
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- W2605061398 title "Unusual step(s) in the fast chlorophyll fluorescence inductionin lichens." @default.
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