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@article{842962,
author = {Hájek, Josef and Váczi, Peter and Barták, Miloš},
article_location = {Praha},
article_number = {2},
keywords = {chlorophyll fluorescence imaging; freezing tolerance; photosystem II; polyols},
language = {eng},
issn = {0300-3604},
journal = {Photosynthetica},
title = {Photosynthetic electron transport at low temperatures in the green algal foliose lichens Lasallia pustulata and Umbilicaria hirsuta affected by manipulated levels of ribitol},
volume = {47},
year = {2009}
}
TY - JOUR
ID - 842962
AU - Hájek, Josef - Váczi, Peter - Barták, Miloš
PY - 2009
TI - Photosynthetic electron transport at low temperatures in the green algal foliose lichens Lasallia pustulata and Umbilicaria hirsuta affected by manipulated levels of ribitol
JF - Photosynthetica
VL - 47
IS - 2
SP - 199-205
EP - 199-205
PB - Elsevier
SN - 03003604
KW - chlorophyll fluorescence imaging
KW - freezing tolerance
KW - photosystem II
KW - polyols
N2 - In lichens, ribitol is known as a carbon storage compound, an osmotic agens involved effectively in cell compartments protection during dehydration of lichen thalli and as a cryoprotective compound. In our study, we investigated the effect of ribitol on photochemical processes of photosynthesis in foliose lichens [Lasallia pustulata (L.) M,rat., Umbilicaria hirsuta (Sw. ex Westr.) Hoffm.] at low temperature. The effects of three concentrations of ribitol, added externally to thalli segments on several chlorophyll (Chl) fluorescence parameters, were evaluated. The 72 h exposition to 8, 16, and 26 mM ribitol led to a concentration-dependent increase in F-V/F-M, decrease in non-photochemical quenching (NPQ) but no change in quantum yield of photosystem II photochemistry (I broken vertical bar(PSII)) values at -5 A degrees C). At higher temperature (0, +5 A degrees C), no effect of ribitol addition on the photosynthetic parameters was apparent.
ER -
HÁJEK, Josef, Peter VÁCZI a Miloš BARTÁK. Photosynthetic electron transport at low temperatures in the green algal foliose lichens Lasallia pustulata and Umbilicaria hirsuta affected by manipulated levels of ribitol. \textit{Photosynthetica}. Praha: Elsevier, 2009, roč.~47, č.~2, s.~199-205, 6 s. ISSN~0300-3604.
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