Plastome phylogenomics and new fossil evidence from Dominican amber shed light on the evolutionary history of the Neotropical fern genus Pecluma.

Autor: Regalado L; Department of Geobiology, University of Göttingen, Goldschmidtstraße 3, Göttingen, 37077, Germany.; Department of Systematics, Biodiversity and Evolution of Plants (with Herbarium), Albrecht-von-Haller Institute for Plant Sciences, University of Göttingen, Untere Karspüle 2, Göttingen, 37073, Germany., Appelhans MS; Department of Systematics, Biodiversity and Evolution of Plants (with Herbarium), Albrecht-von-Haller Institute for Plant Sciences, University of Göttingen, Untere Karspüle 2, Göttingen, 37073, Germany., Poehlein A; Department of Genomic and Applied Microbiology & Göttingen Genomics Laboratory, Institute of Microbiology and Genetics, University of Göttingen, Grisebachstraße 8, Göttingen, 37077, Germany., Himmelbach A; Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstraße 3, Seeland, 06466, Germany., Schmidt AR; Department of Geobiology, University of Göttingen, Goldschmidtstraße 3, Göttingen, 37077, Germany.
Jazyk: angličtina
Zdroj: American journal of botany [Am J Bot] 2024 Oct; Vol. 111 (10), pp. e16410. Date of Electronic Publication: 2024 Sep 30.
DOI: 10.1002/ajb2.16410
Abstrakt: Premise: Molecular studies based on chloroplast markers have questioned the monophyly of the fern genus Pecluma (Polypodioideae, Polypodiaceae), which has several species of Polypodium nested within it. We explored the delimitation of Pecluma and its biogeographic pattern by evaluating the phylogenetic position of four Polypodium species not sequenced thus far and integrating the first fossil evidence of Pecluma.
Methods: Using herbarium material, we applied a genome-skimming approach to obtain a phylogenetic hypothesis of Polypodioideae; assessed the combination of character states observed in the fossil from Miocene Dominican amber using a previously published phylogeny of Polypodioideae based on four plastid markers as framework; calculated divergence times; and conducted an ancestral area estimation.
Results: Within Polypodioideae, Pecluma was recovered as sister to Phlebodium. Three of the newly sequenced species-Polypodium otites, P. pinnatissimum, and P. ursipes-were recovered with maximum support within the Pecluma clade, whereas P. christensenii remained within Polypodium. The closest combination of character states of the fossil was found within Pecluma. Our biogeographic analyses suggest an Eocene origin of the genus in South America, with several subsequent Oligocene and Miocene colonization events to Mexico-Central America and to the West Indies.
Conclusions: Although the circumscription of Pecluma is still challenging, our results elucidate the origin and age of the genus. The newly described fossil, Pecluma hispaniolae sp. nov., supports the hypothesis that the epiphytic communities of the Greater Antilles exhibit a constant generic composition since the Miocene. We propose new combinations (Pecluma otites, Pecluma pinnatissima, and Pecluma ursipes) to accommodate three species previously classified in Polypodium.
(© 2024 The Author(s). American Journal of Botany published by Wiley Periodicals LLC on behalf of Botanical Society of America.)
Databáze: MEDLINE
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