Molecular Ecology and Evolution
Taylor, S.J. , Martin, Noland H. , Arnold, Michael .
Hybrid fitness in Louisiana Iris.
We examined the evolutionary dynamics of hybrid zones between Iris fulva and I. brevicaulis by comparing the fitness of the two hybridizing species with that of their F1 and backcross hybrids. Quantitative Trait Locus (QTL) mapping was performed on separate reciprocal backcross mapping populations to examine the genetic architecture of a number of fitness traits assayed in the field. Asexual (ramet production) and sexual (flowers and fruit production) fitness components were assayed over a two-year period in field plots representative of the common habitat of each species. The two species did not differ in asexual growth in either year; however, the species differed in sexual output during both years. I. fulva and backcrosses toward I. fulva produced significantly more flowers per flowering node than I. brevicaulis, whereas a higher percentage of I. brevicaulis and backcross flowers resulted in the production of a fruit. F1 hybrids revealed the highest values for most fitness components. QTL analyses on these fitness components in both mapping populations revealed multiple genomic regions contributing to the variation in fitness observed in backcross hybrids. Further, some QTLs were found to influence the phenotypic expression of distinct fitness traits across both years in both field sites.
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1 - Texas State University, Department of Biology, 601 University Drive, San Marcos, Texas, 78666, USA
2 - University of Georgia, Department Genetics, Life Sciences Building, Athens, Georgia, 30602, USA
Presentation Type: Poster:Posters for Topics
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM