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The genetic diversity of Asplenium viride (Aspleniaceae) fern colonizing heavy metal-polluted sites

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Abstract

Asplenium viride is a diploid species, belonging to the largest genus of the cosmopolitan fern family Aspleniaceae and occurring on various types of alkaline rocks. It is known to colonize sites with high concentrations of heavy metals, exhibiting changes in frond morphology. A. viride can sometimes form new substrate-dependent ecotypes that can be morphologically and genetically different from parental populations. This study aimed to evaluate the morphological and genetic diversity of A. viride, and test for a potential correlation between variability and heavy metal concentration. Analysis of A. viride specimens from one metalliferous and five non-metalliferous sites showed elevated concentrations of heavy metals in roots of metalliferous plants. The concentrations were higher in roots than in aboveground organs, especially in the case of Cd and Pb, suggesting an excluder strategy for these metals. Both metalliferous and non-metaliferous sites were populated by plants with similar ploidy levels. The overall genetic diversity was low (HT = 0.25) and concentrated between populations (GST = 0.62). The obtained 2C DNA content ranged from 8.67 pg/2C to 8.69 pg/2C. STRUCTURE analysis revealed two groups among the studied populations which did not correlate with heavy metal concentrations and were not significantly supported by AMOVA. This suggests that factors influencing genetic diversity of A. viride are a consequence of intragametophytic selfing caused by patchy habitats and subsequent founder effects, resulting from long-distance colonization by single spores. The species has a potential to colonize heavy metal polluted sites; however, it does not seem to form genetically distinct ecotypes at those sites.

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Acknowledgements

The research was funded by the Institute of Biology of the Nicolaus Copernicus University in Toruń, the Institute of Biology of the Pedagogical University of Kraków, the Department of Agricultural Biotechnology of Bydgoszcz University of Science and Technology, and the W. Szafer Institute of Botany of the Polish Academy of Sciences.

Funding

The research was funded by the Institute of Biology of the Nicolaus Copernicus University in Toruń, the Institute of Biology of the Pedagogical University of Kraków, the Department of Agricultural Biotechnology, the Faculty of Agriculture and Biotechnology of the Bydgoszcz University of Science and Technology, and the W. Szafer Institute of Botany of the Polish Academy of Sciences.

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MWW and GM conceived the idea and wrote the manuscript with input from IJ, AMS, and MP. AMS, GM, and MWW secured funding to support the work. GM, IJ, and AMS performed all the analyses and produced figures and tables. MWW and MP performed the field sampling, taxonomic revision, specimens collection, and conserved material to analyses.

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Correspondence to Marcin W. Woch.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Woch, M.W., Migdałek, G., Jedrzejczyk, I. et al. The genetic diversity of Asplenium viride (Aspleniaceae) fern colonizing heavy metal-polluted sites. Plant Growth Regul 98, 359–369 (2022). https://doi.org/10.1007/s10725-022-00864-3

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