Fig. 7

Comparative analysis of the S. fibuligera ATCC 36309, and KPH12 and KJJ81 genomes. a Synteny analysis between the two genomic sequences (top) with information on sequence coverage and similarity of the S. fibuligera genomes (bottom). WG dot plots of the two genomes were generated using SyMAP. The red boxes indicate an interchromosomal translocation and the green box indicates a deletion. b Synteny blocks between the two genomic sequences were visualized through chromosome painting in SynChro [85]. c Hybrid formation between two S. fibuligera subspecies with subgenomes A and B, respectively. Two subspecies were separated from the last common ancestor of S. fibuligera by various genetic changes. In the subgenome A lineage, S. fibuligera KPH12 diverged from S. fibuligera ATCC 36309 with additional genetic changes, such as the loss of BGL2 and reciprocal translocation between chromosomes 3 and 5. Hybridization of S. fibuligera KPH12 and a parent with subgenome B, followed by loss of the rDNA cluster in subgenome B, might generate the S. fibuligera KJJ81 hybrid carrying seven chromosome pairs. Loss of some non-essential genes in the subgenome B lineage could occur after a hybridization event (asterisk)