How can polyploidy result in sympatric speciation

Shared polymorphism across ploidy levels has therefore often been attributed to multiple polyploid origins, whereas the alternative hypothesis of introgressive hybridization has rarely been rigorously tested. Here, we sequence 12 nuclear loci representing 6 genes duplicated by polyploidy in 92 accessions of the tetraploid Capsella bursa-pastoris together with the corresponding loci in 21 accessions of its close diploid relative Capsella rubella. Furthermore, haplotypes are shared across ploidy levels at 4 loci in western but not in eastern Eurasia.

Chromosomal evolution in higher plants. London: Edward Arnold. One of the most cited sources for polyploidy. Chapters of this book focus on hybridization, polyploidy, and attributes of polyploids. Wendel, Jonathan F. The wondrous cycles of polyploidy in plants.

American Journal of Botany — A wonderful perspective on the interplay between polyploidy and subsequent diploidization, and how this repeated process has shaped Angiosperm genomes.

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