Phylogenetic tree of CCO proteins in nine plant species: L. chinense (Lc), Vitis vinifera (Vv), Solanum lycopersicum (Sl), Oryza sativa (Os), Sorghum bicolor (Sb), Zea mays (Zm), Cinnamomum kanehirae (Ck) and Amborella trichopoda (Atr). ClustalW program of MEGA-X was used for multiple sequence alignment. MEGA-X was also used to build the neighbor-joining (NJ) tree, and the bootstrap repeat value parameter was set to 1000 times. The visualization of phylogenetic trees is achieved through the online website iTOL. The stars represent CCO family proteins of L. chinense. The distance scale “Tree scale 0.1” represents the unit length of the difference values between sequences. The CCO protein/gene IDs of each species are listed in Supplementary Table S1, respectively.