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Relationships between water status and photosystem functionality in a chlorolichen and its isolated photobiont

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Abstract

Main conclusion

Drought tolerance was greater in the whole lichen than in its isolated photobiont. Cell turgor state has an influence on the functionality of photosynthetic process in lichens.

Irreversible thermodynamics is widely used to describe the water relations of vascular plants. However, poikilohydrous organisms like lichens and aeroterrestrial microalgae have seldom been studied using this approach. Water relations of lichens are generally addressed without separate analysis of the mycobiont and photobiont, and only few studies have correlated changes in photosynthetic efficiency of dehydrating lichens to accurate measurements of their water potential components. We measured water potential isotherms and chlorophyll a fluorescence in the lichen Flavoparmelia caperata harvested in different seasons, as well as in its isolated photobiont, the green alga Trebouxia gelatinosa, either exposed to water stress cycles or fully hydrated. No significant seasonal trends were observed in lichen water relations parameters. Turgor loss point and osmotic potential of the whole thallus were significantly lower than those measured in the photobiont, while differences between the water stressed photobiont and controls were not significant. Dehydration-induced drop of F v/F m was correlated with turgor loss, revealing that the photosynthetic activity of lichens partly depends on their turgor level. We provided one of the first quantitative evidences of the influence that turgor status could exert on the functionality of photosynthetic processes in lichens.

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  1. Department of Life Sciences, University of Trieste, Via L. Giorgieri 10, 34127, Trieste, Italy

    Francesco Petruzzellis, Tadeja Savi, Stefano Bertuzzi, Alice Montagner, Mauro Tretiach & Andrea Nardini

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  1. Francesco Petruzzellis
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  2. Tadeja Savi
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  3. Stefano Bertuzzi
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Correspondence to Francesco Petruzzellis.

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Petruzzellis, F., Savi, T., Bertuzzi, S. et al. Relationships between water status and photosystem functionality in a chlorolichen and its isolated photobiont. Planta 247, 705–714 (2018). https://doi.org/10.1007/s00425-017-2814-5

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