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Bark extract influence on spore germination in corticolous lichen Xanthoria parietina in vitro

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Abstract

During establishment and subsequent growth, corticolous lichen fungi are subjected to the chemical composition and pH of the stemflow, which depend on the water-soluble compounds released from the bark. The present study explored the use of spore-shot isolation to test the effect of bark extracts on germination and initial mycelium growth. The pH, phenolic content and glucose equivalents of the bark extracts were also related to spore germination. Bark samples from Acer pseudoplatanus, Alnus glutinosa, Betula pendula, Fagus sylvatica, Fraxinus excelsior, Quercus robur and Tilia cordata were collected at two heights. We extracted water-soluble compounds and isolated fungal spore groups from Xanthoria parietina (L.) Th. Fr. in vitro on water agar mixed with extracts. Spores germinated and grew on pure water agar (control) and media with extracts from Acer, Betula and Fagus. Growth was significantly lower on Acer than on Betula, Fagus and controls. No germination took place on the remaining media suggesting a strong inhibitory effect of Fraxinus, Quercus, Tilia and Alnus. Germination occurred within a week and was an all-or-none response. The mycelia grew slowly, and diameters within 90 days ranged from 0.25 to 3.05 mm. All bark extracts that allowed germination showed a pH above 5.1 and relatively low amounts of phenols and glucose equivalents. This suggests that low pH and strong concentrations of dissolved compounds in the stemflow may prevent lichen colonisation. This method can be variously applied for studying behaviour of dispersed lichen spores.

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Primary data for this study will be stored in the repository Data DOI at the University of Copenhagen.

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Acknowledgements

We are very grateful to 15. Juni Fonden (Grant/Award number 2015-A-4A) and the foundation Godfred Birkedal Hartmanns Familiefond (Grants of 18 May 2016 ‘Water household in bark’ and 23 May 2017 ‘Bark as habitat’) who supported this study. Great thanks are due to Radina Tokin, who was an indispensable help during the measurements of phenolic content and glucose equivalents in the bark extracts. Great thanks are also due to Eric Steen Hansen for his help with verification of the collected lichen material and to Thomas Nord-Larsen, Torben Riis-Nielsen and Sebastian Kepfer Rojas for their statistical advice.

Funding

This study was supported by 15. Juni Fonden (Grant/Award number 2015-A-4A).

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H.N.R. conceived the study and designed the experimental setup together with H.M.E.L. H.M.E.L. collected the data and made the statistical analysis. H.M.E.L. and H.N.R. wrote and revised the manuscript together.

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Correspondence to Hanne Marie Ellegård Larsen.

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Larsen, H.M.E., Rasmussen, H.N. Bark extract influence on spore germination in corticolous lichen Xanthoria parietina in vitro. Mycol Progress 20, 313–323 (2021). https://doi.org/10.1007/s11557-021-01673-0

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