Taylor, Sunni , Martin, Noland .
Homoploid hybrid speciation in Louisiana Iris.
Natural hybridization is common in plants and has played an important role in the evolution of plant biodiversity. Although hybridization commonly results in the production of hybrids that are less fit than the parental species, some hybrid lineages may be fit in a novel habitat such that the hybrid lineage can diverge from the progenitor species. Homoploid hybrid speciation involves the evolution of reproductive isolation between such a hybrid lineage and the originally hybridizing taxa. When originally described, Iris nelsonii was hypothesized to be a homoploid hybrid species derived from hybridization between three widespread species of Louisiana Iris (Iridaceae): Iris brevicaulis, I. fulva, and I. hexagona. In order to investigate the hypothesized hybrid origin of I. nelsonii, we conducted a survey of genetic variation in populations of the three widespread species and I. nelsonii. Results from this molecular work revealed that I. nelsonii shares genetic variation with all three purported progenitor species, supporting the hypothesis that I. nelsonii is indeed a homoploid hybrid species. Such homoploid hybrid speciation is thought to be a relatively rare event and the Louisiana Irises provide a unique system for studying this interesting evolutionary process.
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1 - Texas State University-San Marcos, Biology, 601 University Dr., San Marcos, TX, 78666, United States
2 - Texas State University, Biology, 601 University Drive, San Marcos, TX, 78666, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell C/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 11:30 AM