Strong phylogenetic congruence between Tulasnella fungi and their associated Drakaeinae orchids.

Autor: Arifin AR; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, Australia.; Department of Plant Pathology, Washington State University Tree Fruit Research and Extension Center, Wenatchee, Washington, USA., Phillips RD; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, Australia.; Department of Ecology, Environment & Evolution, La Trobe University, Bundoora, Victoria, Australia.; Department of Biodiversity, Conservation and Attractions, Kings Park Science, Perth, Western Australia, Australia.; Royal Botanic Gardens Victoria, Victoria, Australia., Linde CC; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, Australia.
Jazyk: angličtina
Zdroj: Journal of evolutionary biology [J Evol Biol] 2023 Jan; Vol. 36 (1), pp. 221-237. Date of Electronic Publication: 2022 Oct 30.
DOI: 10.1111/jeb.14107
Abstrakt: The study of congruency between phylogenies of interacting species can provide a powerful approach for understanding the evolutionary history of symbiotic associations. Orchid mycorrhizal fungi can survive independently of orchids making cospeciation unlikely, leading us to predict that any congruence would arise from host-switches to closely related fungal species. The Australasian orchid subtribe Drakaeinae is an iconic group of sexually deceptive orchids that consists of approximately 66 species. In this study, we investigated the evolutionary relationships between representatives of all six Drakaeinae orchid genera (39 species) and their mycorrhizal fungi. We used an exome capture dataset to generate the first well-resolved phylogeny of the Drakaeinae genera. A total of 10 closely related Tulasnella Operational Taxonomic Units (OTUs) and previously described species were associated with the Drakaeinae orchids. Three of them were shared among orchid genera, with each genus associating with 1-6 Tulasnella lineages. Cophylogenetic analyses show Drakaeinae orchids and their Tulasnella associates exhibit significant congruence (p < 0.001) in the topology of their phylogenetic trees. An event-based method also revealed significant congruence in Drakaeinae-Tulasnella relationships, with duplications (35), losses (25), and failure to diverge (9) the most frequent events, with minimal evidence for cospeciation (1) and host-switches (2). The high number of duplications suggests that the orchids speciate independently from the fungi, and the fungal species association of the ancestral orchid species is typically maintained in the daughter species. For the Drakaeinae-Tulasnella interaction, a pattern of phylogenetic niche conservatism rather than coevolution likely explains the observed phylogenetic congruency in orchid and fungal phylogenies. Given that many orchid genera are characterized by sharing of fungal species between closely related orchid species, we predict that these findings may apply to a wide range of orchid lineages.
(© 2022 The Authors. Journal of Evolutionary Biology published by John Wiley & Sons Ltd on behalf of European Society for Evolutionary Biology.)
Databáze: MEDLINE
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