Fig. 1

Phylogenetic relationship of PME genes between Citrus sinensis and Arabidopsis thaliana. The phylogenetic tree was constructed by MEGA X using the Maximum Likelihood Method (1000 bootstrap). The green, yellow, red, and purple backgrounds indicate the four subfamilies (Clade I, II, III, IV) of PMEs in Citrus sinensis (circle) and Arabidopsis thaliana (triangle). The probability of each branch was indicated with solid circles on the top of the branch, and the bigger solid circles indicated higher probabilities