The relationship between thermal dissipation of light energy (as indicated by the quenching of chlorophyll fluorescence), zeaxanthin availability and protonation reactions was investigated in the moss Rhytidiadelphus squarrosus (Hedw.) Warnst. In the absence of zeaxanthin and actinic illumination,
Dissipation of light energy was studied in the moss Rhytidiadelphus squarrosus (Hedw.) Warnst., and in leaves of Spinacia oleracea L. and Arabidopsis thaliana (L.) Heynh., using chlorophyll fluorescence as an indicator reaction. Maximum chlorophyll fluorescence of
Seasonal differences have been observed in the ability of desiccated mosses to dissipate absorbed light energy harmlessly into heat. During the dry summer season desiccation-tolerant mosses were more protected against photo-oxidative damage in the dry state than during the more humid winter season.
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