Fig. 4

Distribution of dN, dS and dN/dS (nonsynonymous/synonymous substitution rate) for 68 cp protein-coding genes obtained from codeml under model M0. The genes were grouped per chloroplast function categories. Each box represents the interquartile range (IQR), showing the middle 50% of the data, with the horizontal line within each box corresponding to the median values for the corresponding category. Outliers are labeled with gene names