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@proceedings{892989,
author = {Hájek, Josef and Smejkal, Lubomír and Barták, Miloš and Váczi, Peter and Lipavská, Helena},
booktitle = {The XVII Congress of the Federation of European Societies of Plant Biology (FESPB 2010) will be held at the Valencia Conference Centre (Palacio de Congresos). Valencia, Spain. 4 - 9 July 2010.},
keywords = {polyols; positive effects of extrenally added ribitol; primary photosynthetic processes; low and freezing temperature; lichen; chlorophyll fluorescence parameters},
language = {eng},
title = {Effects of extrenally added ribitol on primary photosynthetic processes at low and freezing temperature in lichen thalli.},
url = {http://www.geyseco.es/fespb/fespb.html},
year = {2010}
}
TY - CONF
ID - 892989
AU - Hájek, Josef - Smejkal, Lubomír - Barták, Miloš - Váczi, Peter - Lipavská, Helena
PY - 2010
TI - Effects of extrenally added ribitol on primary photosynthetic processes at low and freezing temperature in lichen thalli.
KW - polyols
KW - positive effects of extrenally added ribitol
KW - primary photosynthetic processes
KW - low and freezing temperature
KW - lichen
KW - chlorophyll fluorescence parameters
UR - http://www.geyseco.es/fespb/fespb.html
N2 - In lichens, polyols (sugar alcohols, e.g. ribitol, arabitol, mannitol) have several physiological roles. They are effective carbon storage and anti-freezing substances. Natural levels of polyols in lichens are species-specific and vary within 1.4-8.8 mg.g-1 DW (ribitol), 0.4-29.0 mg.g-1 (mannitol). In our study, we tested positive effects of extrenally added ribitol on primary photosynthetic processes at low/freezing temperature and evaluated interspecific differences between 3 fruticose species (Cetraria islandica, Cetraria nivalis, Cetrariella delisei collected in Southern Norway and single foliose lichen collected in Svalbard. Lichen thalli were exposed to ribitol concentrations of 0 (control), 16, 32, 40, 50 mM for 168 h at 0 deg C and two subzero temperatures. The chlorophyll fluorescence parameters (potential yield of photochemical processes in photosystem II (FV/FM), effective quantum yield in PS II (Yield), and non-photochemical quenching (NPQ) were monitored in 24-h intervals using a chlorophyll fluorescence imaging (Handy Fluor Cam, HFC-010, PSI, CZ). Contents of polyols and other non-structural saccharides (NSS) were evaluated before and after the treatment by a HPLC. Contents of chlorophyll a, b, and total carotenoids were measured by a spectrophotometer (Spekord, Germany). The results indicated importance of polyols in antifreezing tolerance of lichens since positive affect of ribitol addition was apparent at freezing temperature. Funded by the GAAV KJB601630808. Topic: Environmental Stresses and Acclimation. P01-096.
ER -
HÁJEK, Josef, Lubomír SMEJKAL, Miloš BARTÁK, Peter VÁCZI and Helena LIPAVSKÁ. Effects of extrenally added ribitol on primary photosynthetic processes at low and freezing temperature in lichen thalli. In \textit{The XVII Congress of the Federation of European Societies of Plant Biology (FESPB 2010) will be held at the Valencia Conference Centre (Palacio de Congresos). Valencia, Spain. 4 - 9 July 2010.}. 2010.
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