Freezing temperature effects on photosystem II in Antarctic lichens evaluated by chlorophyll fluorescence

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Authors

ANDRZEJOWSKA Aleksandra HÁJEK Josef PUHOVKIN Anton HARANCZYK Hubert BARTÁK Miloš

Year of publication 2024
Type Article in Periodical
Magazine / Source Journal of Plant Physiology
MU Faculty or unit

Faculty of Science

Citation
Web článek dostupný na tomto linku
Doi http://dx.doi.org/10.1016/j.jplph.2024.154192
Keywords Chlorophyll fluorescence; Linear cooling; Antarctic lichens; Kautsky kinetic; Freezing tolerance; Photosynthesis
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Description This study explores and compares the limits for photosynthesis in subzero temperatures of six Antarctic lichens: Sphaerophorus globosus, Caloplaca regalis, Umbilicaria antarctica, Pseudephebe minuscula, Parmelia saxatilis and Lecania brialmontii combining linear cooling and chlorophyll fluorescence methods. The results revealed triphasic S-curves in the temperature response of the maximum quantum yield (FV/FM) and effective quantum yield of photosystem II (?PSII) for all species. All investigated species showed a high level of cryoresistance with critical temperatures (Tc) below - 20 ?C.
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