Venn diagrams of the distribution of differentially expressed miRNAs in response to different symbiotic and pathogenic microorganisms. (a,b) Venn diagrams of known miRNAs (a) and novel miRNAs (b). R.i., Rhizophagus irregularis; S.m., Sinorhizobium meliloti; R.s., Ralstonia solanacearum; V.a-a., Verticillium albo-atrum. The numbers represent the number of miRNAs showing a differential response to the microorganism(s) on each Venn diagram area. miRNAs were declared differential if the adjusted treatment P-value was <0.01 for R.i., S.m. and R.s., and 1 × 10-6 for Va-a. P-values were adjusted to control the false discovery rate using the Benjamini-Hochberg method.