Fig. 1.

Pattern of HGTs between fungi and oomycetes, demonstrating that the majority of the fungal-derived gene transfers are into/or retained by the plant parasitic oomycetes. Using the results of the phylogenetic analysis in combination with alternative topology tests, it was possible to estimate the earliest point of transfer for each of the 21 strongly supported HGTs (Table S3). By comparing the taxonomic distribution of the HGTs it was then possible to identify the putative primary point of acquisition. Incomplete phylogenetic resolution and incomplete taxon sampling may cause these estimates to misplace the HGT events. We also note that the figure is a based on a hypothetical cladogram and does not identify the pattern of transfer relative to either phylogenetic distance or time. Additional genome sampling will enable improved resolution of these transfers. The number labels on each transfer event refer to phylogenetic data in Figs. S1.1–S1.21. Major events in cell evolution are marked to polarize HGTs in relation to evolutionary history of these microbes.