Photosynthetica 2009, 47(2):199-205 | DOI: 10.1007/s11099-009-0033-4

Photosynthetic electron transport at low temperatures in the green algal foliose lichens Lasallia pustulata and Umbilicaria hirsuta affected by manipulated levels of ribitol

J. Hájek1,*, P. Váczi1, M. Barták1
1 Institute of Experimental Biology, Department of Plant Physiology and Anatomy, Faculty of Science, Masaryk University, Brno, Czech Republic

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.) Mérat., 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 FV/FM, decrease in non-photochemical quenching (NPQ) but no change in quantum yield of photosystem II photochemistry (ΦPSII) values at -5 °C). At higher temperature (0, +5 °C), no effect of ribitol addition on the photosynthetic parameters was apparent.

Additional key words: chlorophyll fluorescence imaging; freezing tolerance; photosystem II; polyols

Received: April 7, 2008; Accepted: June 5, 2009; Published: June 1, 2009  Show citation

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Hájek, J., Váczi, P., & Barták, M. (2009). Photosynthetic electron transport at low temperatures in the green algal foliose lichens Lasallia pustulata and Umbilicaria hirsuta affected by manipulated levels of ribitol. Photosynthetica, 47(2), 199-205. doi: 10.1007/s11099-009-0033-4
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