Abstract
Lichens are unique phototrophic organisms whose physiology of stress tolerance attracts much attention. Parameters of photosynthetic and respiratory activities of the epiphytic large-leaved lichen Lobaria pulmonaria were investigated with an aim to reveal physiological responses to seasonal changes in environmental conditions. The highest accumulation of chlorophylls in thalli (2.3 mg/g dry wt) was noted in autumn (October); the amount of green pigments decreased 2.5 times in spring (April). The chlorophyll/carotenoid ratio varied from 3.1 to 4.4. The extent of deepoxidation of xanthophyll cycle pigments equaled 34% in winter but it was two times as low in summer. When L. pulmonaria thalli were hydrated and acclimated shortly under standard laboratory conditions, they exhibited a relatively high photochemical activity and were able to assimilate CO2 throughout the entire annual cycle. The rate of net CO2 uptake by thalli under optimal irradiance and temperature ranged from 3 to 5 µmol CO2/m2 s and the highest values were recorded in spring. No significant seasonal changes were observed in the total respiration rate of thalli. The proportions of various respiratory pathways were altered in spring and autumn, and metabolic heat production was accelerated due to the activation of an energetically low-efficient alternative respiratory pathway. The results provide evidence that the functional adaptation of photo- and mycobionts in the lichen is implicated in resistance of this complete system to seasonal changes in environmental conditions.
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ACKNOWLEDGMENTS
We are grateful to Candidate of Science M.S. Khristin (Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino) for help with measurements of low-temperature fluorescence spectra on L. pulmonaria thalli.
Funding
This work was supported by the state budget assignment for research and development, project no. AAAA-A17-117033010038-7 Physiology and Stress Resistance of Photosynthesis in Plants and Poikilohydric Photoautotrophs in Conditions of the North.
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Translated by A. Bulychev
Abbreviations: AP—alternative respiratory pathway; Car—carotenoids; Chl—chlorophyll; CP—cytochrome respiratory pathway; DEPS—deepoxidation state of violaxanthin cycle pigments; ETC—electron transport chain; PPFD—photosynthetic photon flux density; PSI—photosystem I; PSII—photosystem II; PSA—photosynthetic apparatus; RH—relative humidity; VXC—violaxanthin cycle.
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Shelyakin, M.A., Zakhozhiy, I.G., Dalke, I.V. et al. Photosynthetic and Respiratory Capacity of Foliose Lichen Lobaria pulmonaria throughout the Annual Cycle. Russ J Plant Physiol 68, 1048–1058 (2021). https://doi.org/10.1134/S1021443721060182
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DOI: https://doi.org/10.1134/S1021443721060182