Fig. 3

Species delimitation for Musa itinerans varieties using Bayesian phylogenetics and phylogeography (BP&P) based on 123 single copy nuclear loci. (a) Specie tree estimation: the top four species trees and their posterior probabilities with a total probability of 0.5, and population sizes with Gamma priors θ ~ G (2, 1000) for all populations and divergence times with Gamma priors τ ~ G (2, 2000) for the root age. The abbreviations for different varieties or geographical populations are as follow: Mit: Musa itinerans var. itinerans; Mlc: Musa itinerans var. lechangensis; Mch: Musa itinerans var. chinensis; Mgd1: Musa itinerans var. guangdongensis (population Yangchun, Guangdong); Mgd2: Musa itinerans var. guangdongensis (population Lechang, Guangdong); (b) species delimitation on guide tree: above and below the branches are the posterior speciation probabilities, population sizes are shown on every node, the 95% highest posterior density (HPD) for divergence time are in the brackets and are highlighted using horizontal grey bars. Two geographical populations of M. itinerans var. guangdongensis were lumped with weak posterior probability, the splits of other varieties were supported with high posterior probabilities