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Comparison of the Whole-Plastome Sequence between the Bonin Islands Endemic Rubus boninensis and Its Close Relative, Rubus trifidus (Rosaceae), in the Southern Korean Peninsula.

ABSTRACT: Rubus boninensis is a rare endemic species found on the Bonin Islands with a very restricted distribution. It is morphologically most closely related to Rubus trifidus, occurring widely in the southern Korean peninsula and Japan. This species pair provides a good example of anagenetic speciation on an oceanic island in the northwestern Pacific Ocean-R. trifidus as a continental progenitor and R. boninensis as an insular derivative species. In this study, we firstly characterized the complete plastome of R. boninensis and R. trifidus and compared this species pair to another anagenetically derived species pair (R. takesimensis-R. crataegifolius). The complete plastome of R. trifidus was 155,823 base pairs (bp) long, slightly longer (16 bp) than that of R. boninensis (155,807 bp). No structural or content rearrangements were found between the species pair. Eleven hotspot regions, including trnH/psbA, were identified between R. trifidus and R. boninensis. Phylogenetic analysis of 19 representative plastomes within the family Rosaceae suggested sister relationships between R. trifidus and R. boninensis, and between R. crataegifolius and R. takesimensis. The plastome resources generated by the present study will help elucidate plastome evolution and resolve phylogenetic relationships within highly complex and reticulated lineages of the genus Rubus.

SUBMITTER: Yang J

PROVIDER: S-EPMC6826710 | biostudies-literature |

REPOSITORIES: biostudies-literature

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