Fig. 4

Chromosomal mapping and collinearity of WRKY genes among Citrus sinensis and Poncirus trifoliata. The horizontal columns represent chromosomes with the chromosome numbers placed in the middle and the gene ID shown outside the plot. The gray lines indicated the collinear blocks within these two species genomes, and the syntenic WRKY gene pairs were highlighted with the blue lines. Tandemly duplicated genes are represented by green blocks and the genes located on the duplicated segmental regions have been highlighted by red lines. The exact position of these WRKY genes was documented in Supplementary Table S2 and S3