The nature and genomic landscape of repetitive DNA classes in Chrysanthemum nankingense shows recent genomic changes.

The Chrysanthemum genome has an unusual structure with a very low proportion of tandemly repeated sequences (~1.02%) in the genome, and a high proportion of low-complexity sequences, most likely degenerated remains of transposable elements. Identifying the presence, nature, and genomic organization of major genome fractions, enables inference of evolutionary history of sequences, including degeneration and loss, critical to understanding biodiversity and diversification processes in the genomes of diploid and polyploid Chrysanthemum, Asteraceae and plants more widely.