Publication details

Application of fluorometric methods to measurements of lichen photosynthetic responses to changing temperature and thallus hydration.



Year of publication 2001
Type Article in Proceedings
Conference Ecology of Antarctic Coastal Oasis.
MU Faculty or unit

Faculty of Science

Field Botany
Keywords Cladonia digitata; Hypogymnia physodes; photosynthetic parameters; desiccation; low temperature
Description Slow chlorophyll fluorescence kinetics with quenching analysis, rapid light-response curves of photosynthesis were used to assess response of two lichen species to temperature fall (from 22 to 5 degC) and gradual thalli desiccation (from full hydration (100%) to dry state (0 % of relative water content)). Desiccation to 0-45% led to the decrease in Fv/Fm and PS II quantum yield, while qP was unaffected. Desiccation also promoted qN (non-radiative energy dissipation processes). In the species studied, temperature fall induced decrease in PS II quantum yield and the rate of gross photosynthetis.
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