Photosynthetic electron transport at low temperatures in the green algal foliose lichens <Emphasis Type="Italic">Lasallia pustulata</Emphasis> and <Emphasis Type="Italic">Umbilicaria hirsuta</Emphasis> affected by manipulated levels of ribitol |
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Authors: | J Hájek P Váczi M Barták |
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Institution: | (1) Institute of Experimental Biology, Department of Plant Physiology and Anatomy, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic |
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Abstract: | 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. |
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Keywords: | Additional" target="_blank">Additional chlorophyll fluorescence imaging freezing tolerance photosystem II polyols |
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