Fig. 2

Phylogenetic analysis and synteny analysis of the PPR genes in rice. a Phylogenetic tree of 491 PPR genes in rice. The blue represented the P subfamily and the red represented the PLS subfamily, while the green represented the mixture of PLS proteins and P subfamily genes. Multiple sequence alignment of full-length proteins was performed by ClustalX. The phylogenetic tree was constructed using MEGA7.0 with the neighbor-joining method and 1000 bootstrap replicates. Scale bar represents 0.2 amino acid substitutions per site. b Synteny analysis of PPR genes in rice. Chromosome 1 to 12 are shown with different colors and in a circular form. The different color curves represent the synteny relationship of PPR genes in the rice genome