Abstract
Phylogenetics is crucial in the study of evolutionary processes and the determination of appropriate conservation units, and often these efforts are complicated by hybridization and introgression. Aliciella subsection Subnuda consists of seven species of herbaceous plants occurring in Utah and the Four Corners region of North America. Previous molecular and morphological work left relationships in the subsection unresolved. Here, we use comparative DNA sequencing of ITS and cpDNA regions and RAD-seq data to clarify phylogenetic relationships and examine the role of hybridization in the subsection. We construct haplotype and nucleotype networks from the cpDNA and ITS sequence matrices and compare nuclear and chloroplast phylogenies to identify multiple putative chloroplast capture events. The RAD-seq maximum likelihood phylogeny robustly resolves relationships between six clades, supportive of merging of two species. We employ STRUCTURE and HyDe on the RAD-seq data to evaluate the influence of hybridization within the subsection. The HyDe results provide evidence of hybridization among and between all species in the subsection. Our study robustly resolves relationships in Aliciella subsection Subnuda and provides a framework for discussing its speciation despite a history of hybridization and introgression.
Degree
MS
College and Department
Life Sciences; Biology
Rights
https://lib.byu.edu/about/copyright/
BYU ScholarsArchive Citation
Saunders, Theresa Conley, "Resolving Relationships and Revealing Hybridization in Aliciella Subsection Subnuda (Polemoniaceae)" (2019). Theses and Dissertations. 9126.
https://scholarsarchive.byu.edu/etd/9126
Date Submitted
2019-11-19
Document Type
Thesis
Handle
http://hdl.lib.byu.edu/1877/etd11764
Keywords
RAD-seq, Aliciella, phylogenetics, hybridization, introgression, integrative taxonomy, cytonuclear discordance
Language
english