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@article{857330, author = {Hájek, Josef and Váczi, Peter and Barták, Miloš and Smejkal, Lubomír and Lipavská, Helena}, article_location = {NETHERLANDS}, article_number = {4}, keywords = {chlorophyll fluorescence imaging; fluorescence parameters; lichen thallus; low temperature; Trebouxia}, language = {eng}, issn = {0006-3134}, journal = {BIOLOGIA PLANTARUM}, title = {Cryoproective role of ribitol in Xanthoparmelia somloensis}, volume = {53}, year = {2009} }
TY - JOUR ID - 857330 AU - Hájek, Josef - Váczi, Peter - Barták, Miloš - Smejkal, Lubomír - Lipavská, Helena PY - 2009 TI - Cryoproective role of ribitol in Xanthoparmelia somloensis JF - BIOLOGIA PLANTARUM VL - 53 IS - 4 SP - 677-684 EP - 677-684 PB - SPRINGER SN - 00063134 KW - chlorophyll fluorescence imaging KW - fluorescence parameters KW - lichen thallus KW - low temperature KW - Trebouxia N2 - Thalli of Xanthoparmelia somloensis with natural content of polyols (control) and polyol free thalli (acetone rinsed) were used to study ribitol effects at low temperatures. Thalli segments were cultivated in ribitol concentration of 32 or 50 mM for 168 h at temperatures +5, 0, and minus 5 deg C. The chlorophyll fluorescence parameters (potential yield of photochemical reactions in PS 2 (variable to maximum fluorescence ratio, Fv/Fm), effective quantum yield of photochemical reactions in PS 2 (Yield PS2), and nonphotochemical quenching (NPQ) were monitored in 24h intervals using an imaging system. The effect of 32 mM ribitol on Fv/Fm and Yield PS2 was apparent only at minus 5 deg C, however, the effect was seen throughout the whole exposure. Surprisingly, 50 mM ribitol concentration treatment led to a decrease in Fv/Fm and Yield PS2 and to an increase in NPQ values at minus 5 deg C, while no change was observed at 0 deg C and +5 deg C. Acetone rinsing caused decrease of Fv/Fm, Yield PS2 and NPQ. ER -
HÁJEK, Josef, Peter VÁCZI, Miloš BARTÁK, Lubomír SMEJKAL a Helena LIPAVSKÁ. Cryoproective role of ribitol in Xanthoparmelia somloensis. \textit{BIOLOGIA PLANTARUM}. NETHERLANDS: SPRINGER, 2009, roč.~53, č.~4, s.~677-684. ISSN~0006-3134.
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