Fig. 3

Comparative genomics analyses. a Synteny patterns between genomic regions from wintersweet and Amborella. This pattern shows that some typical ancestral regions in the basal angiosperm Amborella have four corresponding copy regions in wintersweet. This collinear relationship is highlighted by one syntenic set shown in red and green colors. b Syntenic blocks between genomes. Dot plots of orthologs show a 4–4 chromosomal relationship between the wintersweet genome and C. kanehirae genome, and 2–4 chromosomal relationship between wintersweet genome and L. chinense genome. c Distribution of synonymous substitution levels (Ks) of syntenic orthologous (dashed curves) and paralogous genes (solid curves) after evolutionary rate correction. d Evolutionary model of the Laurales genomes. The Laurales ancestral chromosomes are represented by ten colors. Polyploidization events are shown by 3 dots of different colors, along with the chromosome fusions (Fu) and fissions (Fi). The modern structure of the Laurales genomes is illustrated at the bottom of the figure. In some regions, we could not determine which ancestral chromosome they derived from, and those regions were represented as white spaces