Reexamination of a putative diploid hybrid Taxon using genetic evidence: The distinctiveness of Phlox pilosa subsp. deamii (Polemoniaceae)

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Show simple item record Fehlberg, Shannon D. Ty, Maureen M. C. Ferguson, Carolyn J. 2014-12-02T15:36:09Z 2014-12-02T15:36:09Z 2014-12-02
dc.description.abstract Premise of research. A number of recent studies have shown that hybridization plays a key role in the evolution of plants and can lead to the development of genetic and taxonomic novelty, even without a change in ploidy level. Documenting patterns of population genetic diversity for taxa of proposed homoploid hybrid origin and their putative parents leads to an improved understanding of the role of hybridization in the generation of plant diversity. Methodology. Phlox pilosa subsp. deamii is hypothesized to have arisen from diploid hybridization between P. pilosa subsp. pilosa and Phlox amoena. Here we analyzed 18 populations representing all three taxa using a population genetic approach, including microsatellite and chloroplast DNA sequence data. We addressed questions concerning genetic diversity and structure, hybrid origin, and ongoing evolutionary processes. Pivotal results. Several different analyses revealed that genetic variation in P. pilosa subsp. deamii was a mixture of (or was intermediate to) the genetic variation found in P. pilosa subsp. pilosa and P. amoena. However, populations of P. pilosa subsp. deamii were also notably distinct genetically and maintained high levels of genetic diversity. Comparisons between nuclear and chloroplast genetic data provided some evidence for ongoing gene exchange within this system. Conclusions. Phlox pilosa subsp. deamii is distinctive in its genetics, as well as its morphology and ecology. Combined with data from previous studies, population genetic data support a diploid hybrid origin for P. pilosa subsp. deamii, although with sufficient time since its origin for establishment of unique genetic variation. Furthermore, its formation may have come about through complex interactions among the closely related parental taxa, potentially with multiple hybrid generations, backcrossing, and introgression. Such a complex scenario of formation for this subspecific taxon raises questions with respect to the current distinction we make between homoploid hybrid origin of taxa, which is viewed as rare, and introgression, which is undoubtedly prevalent in plants. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.rights (c) 2014 by The University of Chicago en_US
dc.subject Genetic diversity en_US
dc.subject Hybrid origin en_US
dc.subject Hybrid species en_US
dc.subject Introgression en_US
dc.subject Microsatellites en_US
dc.subject Phlox, en_US
dc.subject Reproductive isolation en_US
dc.title Reexamination of a putative diploid hybrid Taxon using genetic evidence: The distinctiveness of Phlox pilosa subsp. deamii (Polemoniaceae) en_US
dc.type Article (publisher version) en_US 2014 en_US
dc.citation.doi 10.1086/677228 en_US
dc.citation.epage 793 en_US
dc.citation.issue 7 en_US
dc.citation.jtitle International Journal of Plant Sciences en_US
dc.citation.spage 781 en_US
dc.citation.volume 175 en_US
dc.contributor.authoreid ferg en_US
dc.contributor.authoreid mauty en_US

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