rpodonnell.bsky.social
Fungal & plant evolution PhD student @EcoEvo_ANU | Orchids & their mycorrhizal symbionts: phylogenomics, popgen, speciation, systematics & taxonomy | rpodonnell.github.io 🍄🌿🌷📖🇵🇭🏳️🌈∞
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We argue that the continued use of anamorph/teleomorph-typified generic names in #Ceratobasidiaceae hinders a holistic understanding of this family, when it is clear that pathogenic and symbiotic species are likely united in their fundamental biology.
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We also found a distinct difference in the way certain names are used in the literature: pathogen researchers are more likely to use Rhizoctonia and Thanatephorus; while orchid mycorrhizal researchers are more likely to use Ceratobasidium and Ceratorhiza.
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Names transferred to #Rhizoctonia include species formerly circumscribed within #Ceratobasidium, #Ceratorhiza, #Moniliopsis, #Thanatephorus, #Tofispora, and #Ypsilonidium (among other synonyms).
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We reiterate the fact that the genera within Ceratobasidiaceae are paraphyletic, and formalise the recognition of a single genus; Rhizoctonia. We present 32 new combinations, to make a total of 52 accepted species of Rhizoctonia.
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Winto is my flavour of the month (read 2023-2024) as I’ve been making my way through his back catalogue
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😮
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I know I dropped off for a couple days of days, gotta get back on the wagon!
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Thank you!
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I’m incredibly grateful for my collaborative team, most notably Darren Wong who introduced me to bioinformatics on the command line. If it wasn’t for him, my pipelines would probably still be running after all these years.
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This whole manuscript started as a side project, since there was some existing data that my supervisors wanted me to see if I could eek any more phylogenetic resolution out of. It quickly became my main focus and took on a life of its own, and my PhD has gone very differently to what I’d planned
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Thank you also to @3rdreviewer.bsky.social who went 3rd reviewer on an early draft of this manuscript during a brief visit to the ANU a couple years ago which prompted a complete rewrite, and to @roblanfear.bsky.social and @fredjaya.bsky.social for comments and assistance with some phylo stats
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Special thanks to Stephanie Lyon who very kindly shared with us unpublished fungal data from the Acianthinae from their PhD thesis work
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This work wouldn’t have been possible without the huge amounts of publicly available data shared by the plant and fungal research community, and I’m extremely grateful for everyone who has made their data available
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We show that in spite of complex evolutionary histories, host-symbiont relationships can be used to help detangle alternative phylogenetic hypotheses.
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We sequenced a transcriptome for the rare mycoheterotrophic underground orchid Rhizanthella, which has eluded phylogenetic placement due to its degraded plastome. For the 1st time we recovered Rhizanthella as sister to Prasophyllum, supported by their exclusive partnerships with Ceratobasidiaceae
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Fungal symbiont preferences are indeed phylogenetically structured in the tribe, supporting Warcup’s earlier hypothesis. Furthermore, these preferences do appear to support certain topological arrangements over others.
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We found an unprecedented level of fungal niche specialisation: whole genera, subtribes, and groups of related subtribes appear to utilise a single fungal family. Moreover, these relationships appear to have become increasingly specialised through time, evolving from a more gregarious ancestor.
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We then mined the literature and over 3000 publicly available fungal sequences representing almost 70 years of work into the mycorrhizal relationships of the Australian terrestrial orchid flora to identify and codify dominant fungal partners for members of the tribe.
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A lack of significant differences in alternate topology frequencies at key problematic nodes suggests that ILS is the main driver of discordance here. This, combined with our estimates that most subtribes diverged within ~10my, is suggestive of a rapid radiation in the tribe’s past
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We used transcriptomes and target capture sequences to infer and date a genus-level phylogeny for the Diurideae. All subtribes within Diurideae are estimated to have diverged before the E-O boundary. We also found high levels of phylogenetic discordance along the tribe’s backbone.