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Phylogeny, Biogeography, and Hybridization in Baptisia (Fabaceae): Genomic Insights into Evolutionary Dynamics and Species Boundaries
Phylogeny, Biogeography, and Hybridization in Baptisia (Fabaceae): Genomic Insights into Evolutionary Dynamics and Species Boundaries
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091541.5
- ISBN
- 9798270229351
- DDC
- 581.75
- 서명/저자
- Phylogeny, Biogeography, and Hybridization in <em>Baptisia </em>(Fabaceae): Genomic Insights into Evolutionary Dynamics and Species Boundaries / Todd Allen Farmer
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (177 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: A.
- 주기사항
- Advisors: Jansen, Robert Committee members: Juenger, Thomas; Yatskievych, George; Cannatella, David.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약This dissertation investigates the evolutionary dynamics of hybridization, phylogeny, and biogeography in the North American endemic Baptisia (Fabaceae) through an integrative phylogenomics and population genomics approach. The study focuses on understanding the complexity of species boundaries, gene flow, and hybrid speciation, with particular attention to taxa in North Texas and the greater Coastal Plains Floristic Province (CPFP). Based on more than 800 single-copy nuclear genes and complete chloroplast genomes assembled from whole genomic sequence (WGS) data, Chapter One reconstructs the phylogeny of the North American Thermopsideae, revealing a complex biogeographic history with evidence for multiple dispersal events between North America and East Asia. This work highlights the relictual nature of certain taxa and challenges traditional taxonomic classifications. Using over 300 nuclear supercontigs from targeted enrichment (HybSeq) data, Chapter Two investigates phylogenomic and population genomic patterns in Baptisia, identifying hybridization and introgression at multiple scales and revealing a CPFP-endemic clade whose sister species show parallel allopatric divergence across distinct phytogeographic zones. Leveraging single nucleotide polymorphism (SNP) data, Chapter Three focuses on a North Texas Baptisia hybrid zone, providing insights into the genomic and morphological complexities of hybrids and introgressents, and investigating patterns of unidirectional, bidirectional, and asymmetric gene flow. The study demonstrates the porosity of species boundaries and reveals rare introgressive triple hybridization, suggesting that the consequences of secondary contact among congeners may be more complex than previously understood. Together, these works identify two key adaptive divergences in the evolutionary history of thermopsoid legumes: an ecological shift from montane and subalpine environments to lower-elevation habitats, exemplified by the divergence of Baptisia, and a subsequent, deeper divergence into the sandy soils of the CPFP. Ultimately, this dissertation highlights the central role of hybridization and habitat specialization in shaping biodiversity, providing a comprehensive framework for understanding the adaptive and biogeographic forces shaping coastal plain endemism, while emphasizing the importance of integrative genomic approaches to understanding hybridization, gene flow, and speciation among angiosperms.
- 언어주기
- English
- 일반주제명
- Geography
- 일반주제명
- Genetics
- 키워드
- Hybridization
- 키워드
- Phylogenomics
- 기타저자
- The University of Texas at Austin Plant Biology
- 기본자료저록
- Dissertations Abstracts International. 87-06A.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr|nu||||||||
■020 ▼a9798270229351
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a581.75
■1001 ▼aFarmer, Todd Allen▼eauthor.
■24510▼aPhylogeny, Biogeography, and Hybridization in emBaptisia /em(Fabaceae): Genomic Insights into Evolutionary Dynamics and Species Boundaries ▼cTodd Allen Farmer
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (177 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: A.
■500 ▼aAdvisors: Jansen, Robert Committee members: Juenger, Thomas; Yatskievych, George; Cannatella, David.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aThis dissertation investigates the evolutionary dynamics of hybridization, phylogeny, and biogeography in the North American endemic Baptisia (Fabaceae) through an integrative phylogenomics and population genomics approach. The study focuses on understanding the complexity of species boundaries, gene flow, and hybrid speciation, with particular attention to taxa in North Texas and the greater Coastal Plains Floristic Province (CPFP). Based on more than 800 single-copy nuclear genes and complete chloroplast genomes assembled from whole genomic sequence (WGS) data, Chapter One reconstructs the phylogeny of the North American Thermopsideae, revealing a complex biogeographic history with evidence for multiple dispersal events between North America and East Asia. This work highlights the relictual nature of certain taxa and challenges traditional taxonomic classifications. Using over 300 nuclear supercontigs from targeted enrichment (HybSeq) data, Chapter Two investigates phylogenomic and population genomic patterns in Baptisia, identifying hybridization and introgression at multiple scales and revealing a CPFP-endemic clade whose sister species show parallel allopatric divergence across distinct phytogeographic zones. Leveraging single nucleotide polymorphism (SNP) data, Chapter Three focuses on a North Texas Baptisia hybrid zone, providing insights into the genomic and morphological complexities of hybrids and introgressents, and investigating patterns of unidirectional, bidirectional, and asymmetric gene flow. The study demonstrates the porosity of species boundaries and reveals rare introgressive triple hybridization, suggesting that the consequences of secondary contact among congeners may be more complex than previously understood. Together, these works identify two key adaptive divergences in the evolutionary history of thermopsoid legumes: an ecological shift from montane and subalpine environments to lower-elevation habitats, exemplified by the divergence of Baptisia, and a subsequent, deeper divergence into the sandy soils of the CPFP. Ultimately, this dissertation highlights the central role of hybridization and habitat specialization in shaping biodiversity, providing a comprehensive framework for understanding the adaptive and biogeographic forces shaping coastal plain endemism, while emphasizing the importance of integrative genomic approaches to understanding hybridization, gene flow, and speciation among angiosperms.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aGeography
■650 4▼aGenetics
■653 ▼aHybridization
■653 ▼aPhylogenomics
■653 ▼aCoastal Plains Floristic Province
■7102 ▼aThe University of Texas at Austin▼bPlant Biology.▼edegree granting institution.
■7201 ▼aJansen, Robert▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06A.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361123▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
