RESEARCH ARTICLE Correlation between sequ

all across the angiosperms [1], and its nucleotide substitution rates are usually low relative to the nuclear genome [2]. sets of plastid genes have experienced increased substitu-tion rates and elevated dN/dS ratios, suggesting the possi-Barnard-Kubow et al. BMC Evolutionary Biology (2014) 14:1 DOI 10.1186/s12862-014-0268-ytide substitution rates and potential signatures of selectionCharlottesville, VA 22904-4328, USA Full list of author information is available at the end of the articleHowever, multiple lineages exhibit extensively rearranged plastid genomes as well as increased rates of nucleotide substitution and elevated dN/dS ratios for some genes [3]. While this connection suggests the potential for a common underlying cause of structural instability and increased nucleotide substitution rates [3], it is import-ant to note that while structural instability impacts the plastid genome as whole, the increase in substitutio