Abstract
Lichen thalli were exposed to 4 regimes differing in irradiance and duration of irradiation. Photosynthetic efficiency of thalli was monitored by chlorophyll fluorescence parameters and xanthophyll cycle analysis. Maximal quantum yield of photosystem 2 (FV/FM) decreased gradually with time in long-term treatment. The effect of additional short-term high irradiance (HI) treatment applied each 24 h was not significant. Nevertheless, short-term HI applied repeatedly on thalli kept in the dark led to a significant decrease of FV/FM. Non-photochemical quenching recorded during the long-term treatment corresponded to the content of zeaxanthin (Z). In short-term treatment, however, proportion of Z (and antheraxanthin) to total amount of xanthophyll cycle pigments recovered to the initial values every 24 h after each repeated short-term HI event in thalli kept in dark. Thus duration of irradiation rather than irradiance and frequency of HI events is important for a decrease in primary photosynthetic processes in wet thalli of Lasallia pustulata. Rapidly responding photoprotective mechanisms, such as conversion of xanthophyll cycle pigments, are involved mainly in short-term irradiation events, even at HI.
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Abbreviations
- A:
-
antheraxanthin
- CMI:
-
continuous medium irradiance
- Chl:
-
chlorophyll
- DEPS:
-
de-epoxidation state of xanthophyll cycle pigments
- DM:
-
dry mass
- FV/FM :
-
dark-adapted maximal quantum yield
- HI:
-
high irradiance
- LHC:
-
light-harvesting complex
- MI:
-
medium irradiance
- NPQ:
-
non-photochemical quenching
- qP :
-
photochemical quenching
- PS2:
-
photosystem 2
- RHIM :
-
repetitive high irradiance applied simultaneously with continuous medium irradiance
- RHID :
-
repetitive high irradiance applied in the dark
- V:
-
violaxanthin
- Z:
-
zeaxanthin
- Φ2 :
-
quantum yield of photochemical reactions in PS2
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Barták, M., Vráblíková-Cempírková, H., Štepigová, J. et al. Duration of irradiation rather than quantity and frequency of high irradiance inhibits photosynthetic processes in the lichen Lasallia pustulata . Photosynthetica 46, 161–169 (2008). https://doi.org/10.1007/s11099-008-0027-7
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DOI: https://doi.org/10.1007/s11099-008-0027-7