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Abstract Detail

Chromosome and Karyotype Evolution in Plants

Baniaga, Anthony [1], Spriggs, Elizabeth [2], Edwards, Erika J. [3], Donoghue, Michael [4].

The puzzle of polyploidy in the Viburnum dentatum species complex of eastern North America.

The Viburnum dentatum species complex (Adoxaceae) is a clade of several closely related lineages that exhibit complex patterns of geographical, morphological, and molecular variation. Populations are widely distributed throughout a variety of microhabitats (mesic forests, wetlands, sand dunes) from eastern Texas across to Florida and northward to Nova Scotia. Previous work in this system hinted at geographically structured ploidal variation within the complex, there being tetraploids and octoploids. Drawing upon extensive field collections across the range of the complex, we link cytological investigations with flow cytometry and RAD-sequencing to assess the geographic and taxonomic distribution of ploidy in the complex. We find strong evidence of geographically and genetically clustered ploidal variation, consistent with current taxonomic treatments, with much of the diversity in the group being represented by octoploids. We also show that octoploids have retained nearly duplicate amounts of DNA as tetraploids throughout the complex. However, our phylogenetic inferences of the clade suggest that tetraploids are nested within octoploids. We examine and present several reasons for this result.

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1 - Yale University, Ecology & Evolutionary Biology, 165 Prospect Street, New Haven, CT, 06511, United States
2 - Yale University, Ecology & Evolutionary Biology, 165 Prospect Street, New Haven, CT, 06511, USA
3 - Yale University, Ecology and Evolutionary Biology, 165 Prospect St, Osborn Memorial Labs, New Haven, CT, 06511, USA
4 - Yale University, Department Of Ecology And Evolutionary Biology, 21 Sachem St., New Haven, CT, 06511, United States

species complex
North America

Presentation Type: Colloquium Presentations
Session: C11, Chromosome and Karyotype Evolution in Plants
Location: /
Date: Friday, July 23rd, 2021
Time: 11:30 AM(EDT)
Number: C11007
Abstract ID:271
Candidate for Awards:None

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