Fig. 2

Conserved motif and gene structure analyses of PME genes in Citrus sinensis. a The conserved motif distribution of CsPME proteins. Each motif is marked with a number in a colored box (motifs 1 to 15). b Exon–intron structure of CsPME genes. Exons and introns are shown by green rectangles and thin lines. c The conserved amino acids of all the conserved motifs. The untranslated regions (UTRs) are indicated by carnation rectangles. Motif 1, 2, 3, 4, 5, 6, and 7 were pectinesterase activity domains, and motif 10 was pectinesterase inhibitor activity domain