Fig. 3

The NBS gene homology analysis results among D. officinale, D. nobile, D. chrysotoxum and V. planifolia. The straight lines represent the orthologous relationships between gene pairs, while curves suggest that the homology type of NBS genes was homochromosomal duplication or heterochromosomal duplication. Blue represents that the NBS gene types between gene pairs were the same, and red represents that the types between gene pairs were different. * The only gene, which was non-NBS gene, was explored from the NBS gene homology analysis