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Core taxa and photobiont-microbial interaction within the lichen Heterodermia obscurata (Physcsiaceae, Heterodermia)

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Abstract

The dual nature of fungal-algal lichen symbioses is extended by other microbial associations. Increasing evidence has confirmed that lichens are successful holobionts composed of complex and multiple species. Specific interactions between these microbes contributed to the lichens’ health, growth and fitness. Previous studies suggested that the composition of microorganisms in lichens was potentially influenced by the genetic background of the host-symbiont, large-scale geography or different photobiont-types (cyanobiont and chlorobiont). However, our knowledge of the interactions between the main symbiotic partners under a certain ecological condition and how horizontal acquisition of these microorganisms contributes to endolichenic microbiome diversity remains limited. In the present study, using amplicon sequencing, we investigated the complex diversity and community composition of fungi, bacteria, and microalgae within Heterodermia obscurata from a similar niche. We found that endophytic bacteria displayed greater diversity than fungi and microalgae. Although preferences for core taxa varied among the different definitions, all analyses support that lichen-forming genus Heterodermia and green alga Trebouxia sp. OTU A15 were the main symbionts, and the bacterium Beijerinckiaceae was the core microbiome in H. obscurata. Significantly, we found that different alga species (Trebouxia) from H. obscurata are accompanying with a shift in composition and function of endolichenic bacteria and fungi. This finding suggested that besides host- or habitat specificity as well as photobiont-types, the shifts of dominant alga may also contribute to the taxonomical and functional differences of microbiomes within lichens.

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Data availability

The raw data were deposited in the NCBI Sequence Read Archive (SRA) with the accession BioProject ID PRJNA672244 (https://dataview.ncbi.nlm.nih.gov/object/PRJNA672244). The voucher specimens of materials were saved in the Herbarium, Kunming Institute of Botany, CAS.

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Acknowledgements

The authors thank Dr. Jian Liu, Ying Zheng, Yujuan Zhao and Li Hu for manuscript revision. We would like to thank the anonymous reviewers for the thoughtful comments and constructive suggestions toward improving our manuscript.

Funding

This work was supported by the National Key R&D Program of China [2017YF0505200 to H.S.] and the Strategic Biological Resources Service Network Programme of Chinese Academy of Sciences [ZSSD-006 to X.G. ].

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Contributions

Xun Gong contributed to the study conception. Lisong Wang identified the material. Haiyan Xu and Xiuyan Feng performed data collection and analyses. Haiyan Xu wrote the first draft, and all authors commented, revised and approved the manuscript.

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Correspondence to Xun Gong.

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The authors declare that they have no conflict of interest.

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Xu, H., Wang, L., Feng, X. et al. Core taxa and photobiont-microbial interaction within the lichen Heterodermia obscurata (Physcsiaceae, Heterodermia). Symbiosis 86, 187–204 (2022). https://doi.org/10.1007/s13199-022-00832-5

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  • DOI: https://doi.org/10.1007/s13199-022-00832-5

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