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Although polyploidy has long been recognized as a major force in the evolution of plants, most of what we know about the genetic consequences of polyploidy comes from the study of crops and model systems. Furthermore, although many polyploid species have formed repeatedly, patterns of genome evolution and gene expression are largely unknown for natural polyploid populations of independent origin. We therefore examined patterns of loss and expression in duplicate gene pairs (homeologs) in multiple individuals from seven natural populations of independent origin of Tragopogon mirus (Asteraceae), an allopolyploid that formed repeatedly within the last 80 years from the diploids T. dubius and T. porrifolius.

Using cDNA-AFLPs, we found differential band patterns that could be attributable to gene silencing, novel expression …