Antarctic lichens exhibit diverse photobiont distributions and a complex regulation of non-photochemical quenching
Jazyk angličtina Země Anglie, Velká Británie Médium print-electronic
Typ dokumentu časopisecké články
PubMed
39923706
DOI
10.1016/j.saa.2025.125810
PII: S1386-1425(25)00116-7
Knihovny.cz E-zdroje
- Klíčová slova
- Carotenoids, Chlorophyll a fluorescence transient, High resolution microscopy, Optical signal, Raman spectra, Scytonemin,
- MeSH
- chlorofyl a * metabolismus MeSH
- chlorofyl * metabolismus analýza MeSH
- lišejníky * metabolismus chemie fyziologie MeSH
- Ramanova spektroskopie * MeSH
- sinice metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Antarktida MeSH
- Názvy látek
- chlorofyl a * MeSH
- chlorofyl * MeSH
The structure, function, and molecular mechanisms of lichen survival in harsh habitats like Antarctica and Alpine localities, where environmental extremes change frequently, are highly interesting yet largely underexplored. We used high resolution microscopy, Raman spectroscopy, and chlorophyll a fluorescence to investigate the basic structure and function, i.e., intrathalline distribution and allocation of photobionts, as well as the heat dissipation process in three Antarctic lichens: Dermatocarpon polyphyllizum (DP), Umbilicaria antarctica (UA), and Leptogium puberulum (LP). Microscopic images of their transverse slices revealed visual insights into the heterogeneous distribution of photobionts within their structurally distinct thalli. Raman spectra showed shifts in the carotenoid Raman ν1(CC) band between lichens with algal (DP and UA) and cyanobacterial (LP) photobionts, and interestingly, they revealed biosynthesis of scytonemin, a UV-screening pigment, in cyanolichen LP. We found that increasing actinic irradiance has a nearly equal effect on the shape of chlorophyll fluorescence transients also during dark relaxation in lichens with algal photobionts, but it differed greatly for cyanolichen LP. The dark relaxation kinetics of non-photochemical quenching (NPQ) in experimental lichens differed significantly between lichens with algal photobionts DP and UA; however, this parameter could not be calculated in cyanolichen LP. The components of NPQ revealed that rapidly relaxing energy dependent quenching, ΦqE, is active and protects the thallus of DP predominantly; however, in UA state transition quenching, ΦqT, predominates. The diversity in NPQ across the three examined lichens revealed intriguing aspects of heat dissipation in their photobionts as a mechanism for survival under Antarctica conditions.
Global Change Research Institute Czech Academy of Sciences Bělidla 986 4a 603 00 Brno Czech Republic
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