Curling during desiccation protects the foliose lichen Lobaria pulmonaria against photoinhibition |
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Authors: | Milo? Barták Knut Asbjørn Solhaug Hana Vráblíková Yngvar Gauslaa |
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Institution: | Department of Plant Physiology and Anatomy, Masaryk University, Kotlarska 2, 61137, Brno, Czech Republic. |
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Abstract: | This study aims to assess the photoprotective potential of desiccation-induced curling in the light-susceptible old forest
lichen Lobaria pulmonaria by using chlorophyll fluorescence imaging. Naturally curled thalli showed less photoinhibition-induced limitations in primary
processes of photosynthesis than artificially flattened specimens during exposures to 450 μmol m−2 s−1 in the laboratory after both 12- (medium dose treatment) and 62-h duration (high dose treatment). Thallus areas shaded by
curled lobes during light exposure showed unchanged values of measured chlorophyll fluorescence parameters (F
V/F
M, ΦPS II), whereas non-shaded parts of curled thalli, as well as the mean for the entire flattened thalli, showed photoinhibitory
limitation after light treatments. Furthermore, the chlorophyll fluorescence imaging showed that the typical small-scale reticulated
ridges on the upper side of L. pulmonaria caused a spatial, small-scale reduction in damage due to minor shading. Severe dry-state photoinhibition readily occurred
in flattened and light-treated L. pulmonaria, although the mechanisms for such damage in a desiccated and inactive stage are not well known. Natural curling is one strategy
to reduce the chance for serious photoinhibition in desiccated L. pulmonaria thalli during high light exposures. |
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Keywords: | Chlorophyll fluorescence imaging Lobaria pulmonaria Photoprotection Poikilohydric organisms |
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