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@inproceedings{777150,
author = {Hájek, Josef and Váczi, Peter and Barták, Miloš and Smejkal, Lubomír},
address = {Lund},
booktitle = {Physiologia Plantarum. Special Issue: Redox Signal Integration. FESPB 2008 Abstracts},
keywords = {polyols; cryoprotective role; low temperature; ribitol},
language = {eng},
location = {Lund},
pages = {09-056},
publisher = {John Wiley - Blackwell},
title = {Addition of ribitol into Xanthoparmelia somloensis thallus alters photosynthetic processes in PS II of symbiotic alga at sub-zero temperature},
url = {http://www.fespb2008.org},
year = {2008}
}
TY - JOUR
ID - 777150
AU - Hájek, Josef - Váczi, Peter - Barták, Miloš - Smejkal, Lubomír
PY - 2008
TI - Addition of ribitol into Xanthoparmelia somloensis thallus alters photosynthetic processes in PS II of symbiotic alga at sub-zero temperature
PB - John Wiley - Blackwell
CY - Lund
KW - polyols
KW - cryoprotective role
KW - low temperature
KW - ribitol
UR - http://www.fespb2008.org
N2 - Ribitol and other polyols have a cryoprotective role in plants and lichens. We tested positive effects of extrenally added ribitol (32, 50 mM)on primary photochemical processes at low temperature (5, 0, and -5 deg C) in X. somloensis. After ribitol addition, thalli segments were exposed to 300 umol m-2 s-1 at the above temperatures for 168 h. Each 24 h, chlorophyll fl uorescence parameters (Fv/Fm, effective quantum yield of PS II - Yield PS II, non-photochemical quenching - NPQ) were measured by an imaging fl uorometer (HFC-010, P.S.I., CZ). Positive effect of ribitol on Fv/Fm and Yield PS II, was apparent only at -5 deg C. The significant effect was seen early, i.e. within the fi rst 24 h. The difference in Fv/Fm and Yield PS II between control and 32 mM treated thalli was seen throughout the whole exposition period. Surprisingly, 50 mM treatment led to a decrease in Fv/Fm and Yield PS II values at -5 deg C, while no change was seen at 0, 5 deg C. Such ribitol concentration was a considerable stressor to PS II which might be documented by dramatic increase in NPQ. Supported by the GAAV KJB601630808 funding.
ER -
HÁJEK, Josef, Peter VÁCZI, Miloš BARTÁK a Lubomír SMEJKAL. Addition of ribitol into Xanthoparmelia somloensis thallus alters photosynthetic processes in PS II of symbiotic alga at sub-zero temperature. In \textit{Physiologia Plantarum. Special Issue: Redox Signal Integration. FESPB 2008 Abstracts}. Lund: John Wiley - Blackwell. s.~09-056, 1 s. ISSN~0031-9317. 2008.
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