Synteny maps of the S-locus of 11 Poaceae species. The phylogenetic tree (left), representing the different species, was drawn according to the NCBI taxonomy database. For allohexaploid Triticum aestivum L., the three homologous genomes A, B, and D are given. The gene- and marker-less regions are represented as shaded breaks, and a white space indicates an assembly gap. The genes present at the S-locus are represented with directed arrows, and the self-incompatibility candidate genes are colored in teal and blue. A non-functional gene copy of the self-incompatibility candidates is indicated with a white striped pattern. The gene orientation is shown with the pointy side representing the 3′ end. The markers used for the fine-mapping are represented by black bars, and the number of recombinants for each marker is indicated between brackets for L. perenne Kyuss. Lines illustrate the synteny between genes, and in case of orientation change, a small circular arrow is used. In addition, the compatibility phenotype is indicated on the right: self-incompatible (SI) or self-compatible (SC).