Fig 5. The independent network inferred from the top 1000 fungus-poplar relationships.

Individual genes simultaneously connected with many other genes were sequentially marked as 1, 2, 3, 4, 5, and 6. Mark 1 represents a fungal metalloprotease gene that was surrounded by 10 poplar genes, including 2 DR genes; mark 2 is a poplar DR gene that is connected to 16 fungal genes. Marks 3 and 5 are the poplar genes secretory carrier 3 and NAD(P)-binding Rossmann-fold superfamily protein, respectively; marks 4 and 6 are poplar genes with unknown functions. The three arrows denote the position of 3 DR genes. The fungal genes are shown in red, and the poplar genes are shown in blue.