Application of fluorometric methods to measurements of lichen photosynthetic responses to changing temperature and thallus hydration.
| Authors | |
|---|---|
| Year of publication | 2001 |
| Type | Article in Proceedings |
| Conference | Ecology of Antarctic Coastal Oasis. |
| MU Faculty or unit | |
| Citation | |
| 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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