Abstract
In this review, we discuss findings from studies carried out over the past 20+ years that document the occurrence of asymmetric introgressive hybridization in a plant clade. In particular, analyses of natural and experimental hybridization have demonstrated the consistent introgression of genes from Iris fulva into both Iris brevicaulis and Iris hexagona. Furthermore, our analyses have detected certain prezygotic and postzygotic barriers to reproduction that appear to contribute to the asymmetric introgression. Finally, our studies have determined that a portion of the genes transferred apparently affects adaptive traits.
Highlights
The network of interactions between flowering plants and their pollinators can be complex in terms of the number of pollinator classes visiting a given plant species
We will discuss genetic analyses of natural and experimental hybrid populations formed from crosses between Iris fulva, Iris brevicaulis and Iris hexagona that 1) detected the occurrence of asymmetric introgression, 2) defined some of the reproductive isolating barriers contributing to the asymmetric introgression and 3) revealed the genetic architecture associated with this asymmetric exchange
Evolutionary and ecological studies of Louisiana Irises have confirmed the process of asymmetric introgression
Summary
The network of interactions between flowering plants and their pollinators can be complex in terms of the number of pollinator classes visiting a given plant species. Evolutionarily important, consequence can occur when there is spatial overlap between closely related plant taxa These co-occurrences may lead to the process of introgressive hybridization (or introgression), a process by which genes are transferred through the formation of an initial F1 hybrid that subsequently crosses with individuals of one or both of the parental species [1]. We will discuss genetic analyses of natural and experimental hybrid populations formed from crosses between Iris fulva, Iris brevicaulis and Iris hexagona that 1) detected the occurrence of asymmetric introgression, 2) defined some of the reproductive isolating barriers contributing to the asymmetric introgression and 3) revealed the genetic architecture (in terms of the distribution of segregation distortion) associated with this asymmetric exchange
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