Fig. 4

Types and distributions of repeat sequences and short sequence repeats (SSRs) in Cucurbita ficifolia chloroplast (cp) genomes. (A) Proportion of SSRs in C. ficifolia cp genomes. (B) Numbers of different types of repeat sequences in the C. ficifolia cp genomes. (C) Codon content for the 20 amino acids and stop codons in 86 protein-coding genes of C. ficifolia chloroplast genomes. (D) Sliding window analysis of 160 complete chloroplast (cp) genomes from Cucurbita ficifolia. The x-axis represents the midpoint of the window and the y-axis represents the nucleotide diversity (Pi) of each window. The window length is 600 bp with a 200-bp step size