@ARTICLE{TreeBASE2Ref18178, author = {Paul G. Wolf and Pamela S. Soltis and Douglas E. Soltis}, title = {Phylogenetic significance of chloroplast restriction site variation in the Ipomopsis aggregata complex and related species (Polemoniaceae).}, year = {1993}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {18}, number = {}, pages = {652--662}, abstract = {The Ipomopsis aggregata complex comprises diploid, perennial, montane herbs, distributed across western North America. We used chloroplast DNA (cpDNA) restriction site variation to examine phylogenetic relationships among the three species in the complex, I. aggregata, I. arizonica and I. tenuituba, and several related species. Twenty-one restriction site mutations and four length mutations were used to reconstruct a phylogenetic tree by cladistic methods. With a few exceptions, patterns of cpDNA variation within I. aggregata were consistent with current taxonomy and reflected the geographic distributions of subspecies and populations. However, cpDNA-based relationships among species were not congruent with a pre-I992 taxonomy of the group. Ipomopsis tenuituba did not form a distinct clade; two populations of this species had the same primitive cpDNA as l. arizonica and I. rubra, whereas two other populations emerged on branches within I. aggregata, and one population (of I. tenuituba subsp. macrosiphon) shared mutations with I. thurberi. It is not clear whether this pattern is the result of cpDNA transfer during periods of hybridization or the tenuituba morphology has arisen independently more than once. Ipomopsis tenuituba subsp. macrosiphon has subsequently been segregated as a species. The level of sequence divergence among species was similar in magnitude to that among populations within each species, consistent with patterns of recent divergence and subsequent hybridization among the three species in the complex. In addition, relationships based on cpDNA variation reflected taxonomy and geographic distribution more congruently than did allozymes. The results from this study suggest that evolution of the I. aggregata complex has involved cases of chloroplast DNA transfer between taxa, convergent evolution for certain floral characters, or both.} }

• Go to search
• Citation
• Taxa
• Matrices
• Trees
• Analyses
• 

CiteULike

Delicious

Connotea