Photosynthesis and photoprotection are more influenced by light duration than light intensity in the lichen <i>Lasallia pustulata</i>
| Authors | |
|---|---|
| Year of publication | 2006 |
| Type | Article in Proceedings |
| Conference | FESPB 2006 Congress: Book of Abstracts |
| MU Faculty or unit | |
| Citation | |
| Web | Congress website |
| Field | Botany |
| Keywords | zeaxanhtin;DEPS;photosynthesis;chlorophyll fluorescence;high light stress |
| Description | The aim of our study was the evaluation of the effect of short-term vs. long-term light exposure and their combination in the lichen Lasallia pustulate. We studied the responses to light exposures by measuring of chlorophyll (Chl) fluorescence parameters and determination of conversion state of xanthophyll cycle pigments (DEPS). We exposed lichen thalli to 4 different light treatments: 1. short-term high light (SHL), 2. continuous low light (LL), 3. continuous LL with SHL applied once every 24 h during the experiment, 4. dark with SHL applied once every 24 h during the experiment. Effect of repeated SHL exposures was more apparent in Chl fluorescence parameters of thalli placed in the dark than the thalli placed under continuous LL. However, DEPS recovered to initial values in thalli placed in the dark after each SHL event, even after repeated SHL treatments. Similarly, repeated SHL applied on LL thalli caused no difference in Chl fluorescence and DEPS compared to LL thalli. In conclusion, rather the light duration than its dose is more photoinhibiting for photosyntetic performance in L. pustulata. |
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