Fig. 6

Phylogeny and tests for gene introgression of five tribes of Oleaceae. a Plastome concatenated tree inferred from a 76-coding gene supermatrix. b ASTRAL species tree and the nuclear concatenated phylogeny inferred from 2608 nuclear genes. Pie charts in the nodes present the proportion of gene trees that support the main topology (red), the first alternative (blue), and the second alternative (green). Gene concordance factor (gCF)/site concordance factor (sCF) values are shown above the branches. ML bootstrap/astral local posterior probabilities are shown below branches. c Cladograms of the coalescent-based species tree (heavy black lines) and 500 gene trees (in green) randomly sampled from 2608 inferred gene trees. d The most common topologies in gene trees, sorted by frequency of occurrence, as shown in brackets. e Comparison of branch length of five tribes. The root-to-tip branch length of each gene tree and each sample were assessed. f Pairwise D per species pair (lower diagonal) and the mean total proportion of introgressed loci per species pair inferred through QuIBL analysis (upper diagonal). 0 values correspond to nonsignificant values. More details were provided in Table S5. g–i Phylogenetic network analysis using PhyloNet. Numerical values next to curved branches indicate inheritance probabilities for each hybrid node. Myx, Myxopyreae; Fon, Fontanesieae; For, Forsythieae; Jas, Jasmineae; Ole, Oleeae