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Wang, Shenyi [1], Li, Pan [2], Cameron, Kenneth [3].

Plastome structure, phylogenetics, and historical biogeography of Liliaceae subfamily Streptopoideae.

Liliaceae have always been a challenging family to classify and the taxonomy of one constituentsubfamily, Streptopoideae, has also been plagued with controversy. As currently circumscribedStreptopoideae contain three genera: Prosartes, Scoliopus, and Streptopus with 17 species that aredistributed across the Northern Hemisphere. A few of the species even exhibit inter-continentaldisjunctions. Although several higher-level molecular phylogenetic studies have included a handful ofspecies from this subfamily as placeholders, the whole picture of finer scale phylogenetics among theseplants has never been studied adequately. We resolved the phylogenetic relationships,estimated divergence times among clades, and reconstructed historical biogeography withinStreptopoideae and several outgoup taxa using newly sequenced de novo assembled and annotated wholechloroplast genomes. We achieved a high level of sampling for the ingroup (15 of 17 species), and alsoconsidered a moderate level of intraspecific sampling for the two species, S. amplexifolius and S.lanceolatus, with the widest geographic distribution. We compared and contrasted the structure ofStreptopoideae plastomes, demonstrating that they have relatively large genomes, but with same genearrangement that characterizes other Liliaceae. A relatively well resolved and supported phylogeneticreconstruction supports the North American genera Prosartes and Scoliopus sharing a recent commonancestor, with Streptopus as sister to them. The subfamily diverged from its shared ancestor with Tricyrtisat least 57 Mya in the late Paleocene of either Western North America or East Asia. The species ofStreptopus in North America appear to have migrated to the east from Asia more recently. Relationshipswithin each genus are fully resolved, but mostly supported only by short branch lengths. One individualof S. lanceolatus from the Pacific Northwest showed evidence of chloroplast capture from sympatric S.amplexfolius. These results indicate that alternative molecular methods targeting the nuclear genome will be needed to further tease apart the evolutionary history of this group.

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1 - Univ of Wisconsin-Madison, Dept of Botany, Madison, WI, 53706, USA
2 - Zhejiang University, College Of Life Sciences, 866 Yuhangtang Rd., Xihu District, Hangzhou, 33, 310058, China
3 - University Of Wisconsin, Department Of Botany, 154 Birge Hall, 450 Lincoln Drive, Madison, WI, 53706, United States

North America

Presentation Type: Oral Paper
Session: SYSTIII, Systematics III: Algae to Lilioid Monocots
Location: Virtual/Virtual
Date: Tuesday, July 20th, 2021
Time: 4:45 PM(EDT)
Number: SYSTIII008
Abstract ID:405
Candidate for Awards:None

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