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dc.contributor.advisorBarker, Michael S.
dc.contributor.authorBaniaga, Anthony Ernest-Fiorentino
dc.creatorBaniaga, Anthony Ernest-Fiorentino
dc.date.accessioned2019-06-07T22:31:09Z
dc.date.available2019-06-07T22:31:09Z
dc.date.issued2019
dc.identifier.urihttp://hdl.handle.net/10150/632581
dc.description.abstractThe evolutionary processes responsible for generating and maintaining the remarkable diversity of life on earth are mutation, selection, drift, recombination, and gene flow. The relative magnitude of these processes, and their tempo, can be inferred from studying genomes or samples of the genome from individuals or multiple individuals. My dissertation focuses on three types of change in vascular plant genomes, with a focus on lycophytes in the genus Selaginella (Selaginellaceae). In Appendix A I characterize the extremely small genome sizes of Selaginella, and compare their observed disparity in genome size to other vascular plant clades. In Appendix B I examine the temporal activity of long terminal repeat retrotransposons (LTR-RTs) in vascular plants. I illustrate that across vascular plants LTR-RT activity largely explains the observed diversity in genome size. In Appendix C and D I focus on abrupt changes in the genome via polyploidy and hybridization. In Appendix C I demonstrate the importance of climatic niche divergence in polyploid plant species. In Appendix D I investigate the evidence of hybrid speciation in hybrids formed between Selaginella arizonica and S. eremophila in the Sonoran Desert. Using transcriptome sequencing and complementary morphological and ploidal inference, I suggest that both homoploid hybrid and allopolyploid species were formed from the same parents S. arizonica and S. eremophila. This system is the first known example of two types of stabilized hybrid derivatives from the same parents in natural populations.
dc.language.isoen
dc.publisherThe University of Arizona.
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
dc.subjectGenome Size
dc.subjectHybridization
dc.subjectLong Terminal Repeat Retrotransposon
dc.subjectPolyploidy
dc.subjectSelaginella
dc.subjectSonoran Desert
dc.titleChanges in the Genome: Polyploidy, Hybridization, and Genome Size Evolution Explored Through Selaginella and Vascular Plants
dc.typetext
dc.typeElectronic Dissertation
thesis.degree.grantorUniversity of Arizona
thesis.degree.leveldoctoral
dc.contributor.committeememberFerriere, Regis
dc.contributor.committeememberRobichaux, Robert H.
dc.contributor.committeememberSanderson, Michael J.
dc.contributor.committeememberWorobey, Michael
dc.description.releaseRelease after 08/01/2020
thesis.degree.disciplineGraduate College
thesis.degree.disciplineEcology & Evolutionary Biology
thesis.degree.namePh.D.


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