Anatomical and physiological specializations for plant adaptation to harsh climates result from molecular mechanisms that can be encoded in the nucleus or organelle. In this study, the complete plastomes of an arctic species, Bunge (Fabaceae), and a closely related temperate species, Douglas ex Hook., were assembled, annotated, and analyzed to identify differences that might help explain their adaptation to different environments. This is consistent with the previously sequenced DC. and plastomes, and plastomes both have the common features of the inverted repeat-lacking clade (IRLC), as well as F intron loss, which is unique to the genus. However, significant differences were observed between the plastomes of and and other closely related species ( spp. and spp.), including a 3 kb inversion, two large insertions (>1 kb), significant modifications of the gene, and an overall larger size.
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