Phylogenetics and genomic patterns of speciation in Pinus with an empahsis on subgenus Strobus
| Autor: | Syring, John V. |
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| Rok vydání: | 2006 |
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| Druh dokumentu: | Thesis/Dissertation |
| Popis: | Data from nuclear ribosomal internal transcribed spacer regions (nrITS) and chloroplast DNA (cpDNA) have failed to resolve phylogenetic relationships in Pinus. To provide greater interspecific resolution, five low-copy nuclear genes were developed from mapped conifer anchor loci. Four genes were sequenced from species representing all Pinus subsections. Individual loci do not uniformly support the nrITS or cpDNA hypotheses. Combined analysis of low-copy nuclear loci produces a well-supported subsectional topology. The phylogenetic positions of P. nelsonii and P. krempfii are of systematic interest. Results strongly support P. nelsonii as sister to sect. Parrya, and suggest a moderately well-supported position of P. krempfii as sister to the remaining sect. Quinquefoliae. The most informative locus, a Late Embryogenesis Abundant-like gene, was used to explore phylogenetic relationships among closely related species in subg. Strobus. Thirty-nine species were sequenced, with two or more alleles representing 33 species. Nineteen of 33 species exhibited allelic nonmonophyly in the strict consensus tree. Nucleotide diversity was strongly associated (P Graduation date: 2006 |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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