Summary
The effect of high temperatures on the photosynthetic apparatus of Preissia quadrata (Scop.) Nees, Conocephalum conicum (L.) Dum. and Marchantia polymorpha L. were investigated. changes in the activities of various photosynthetic reactions were followed by measuring light-dependent oxygen evolution, chlorophyll a fluorescence and light-induced absorbance changes at 518 nm.
Mild heat treatment of the thalli led to reversible depression of photosynthesis; the period necessary for complete recovery depended on the extent of heat damage. Irreversible inactivation of photosynthesis after more severe heat stress was caused by damage of photosystem II. On principle, the pattern of reversible and irreversible heat inactivation of photosynthetic reactions in liverwort thalli resembles that observed in leaves of higher plants. However, in contrast to a number of Spermatophyta, exposure of liverwort thalli to high sublethal temperatures did not result in a significant increase in the heat stability of the photosynthetic apparatus indicating that the heat hardening capacity of hygrophytic hepatics is extremely low.
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Weis, E., Wamper, D. & Santarius, K.A. Heat sensitivity and thermal adaptation of photosynthesis in liverwort thalli. Oecologia 69, 134–139 (1986). https://doi.org/10.1007/BF00399049
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DOI: https://doi.org/10.1007/BF00399049