Fig. 1

Maximum likelihood phylogenetic analysis of PME family in Arabidopsis thaliana, Fragaria vesca, Malus domestica, Pyrus bretschneideri, Prunus mume, Prunus persica and Rosa chinensis. The full-length sequences of PME proteins were aligned using ClustalX, and the phylogenetic tree was generated using MEGA X with the NJ method. Those PME genes were divided into four main groups, among them, groups 1, 2 and 4 could be further divided into serval sub-groups (groups 1a-1 g, 2a-2b and 4a-4d). Different sub-groups were labelled and distinguished with each other by different branch color. Furthermore, PME genes from different species were labelled with different shape types