Figure 3.

Phytophthora gene-sparse regions are highly enriched in effector genes. (a) Alignment of Phytophthora genomes showing the localization of two avirulence effector genes in gene-sparse regions. The two examples are Phytophthora infestans PiAvr4 and Phytophthora sojae PsAvr4 and PsAvr6. (b) Distribution of Phytophthora infestans RXLR effectors, CRN effectors, and ribosomal protein genes (spots) according to the length of their 5' and 3' flanking intergenic regions. Percentages show the proportion of the gene group falling in the gene-dense region (GDR) and gene-sparse region quadrants as delimited by the 1.5 kb flanking intergenic region length cutoff (dashed lines).