Abstract
The temperate woody bamboos (tribe Arundinarieae) present long-standing taxonomic uncertainty owing to rapid radiation, frequent hybridization, and convergent morphology, which obscure species-level relationships. Although plastome phylogenomics has clarified deep lineages at the species level, Korean and Japanese taxa have received little molecular attention, leaving East Asian species diversity incompletely understood. To address this gap, we analyzed plastid genome data from 36 species and nuclear ribosomal ITS (nrITS) data from 30 species. We newly assembled complete plastomes for 12 species, seven of which are reported here for the first time. The plastome phylogeny recovered two strongly supported lineages, the Arundinaria and Phyllostachys clades, consistent with earlier studies. By contrast, the nrITS phylogeny showed substantial topological incongruence, revealing plastid-nuclear discordance with the plastome tree, particularly in the placement of the Pleioblastus subclade. Nevertheless, many species were consistently resolved within the same clades or subclades across both datasets, indicating stability at lower phylogenetic levels. Seven taxa, however, exhibited conflicting placements, suggesting signals of hybrid origin. A notable case was Arundinaria munsuensis, a Korean endemic restricted to Mt. Jirisan, which was consistently resolved within Pleioblastus in both plastome and nrITS phylogenies, supported also by morphological evidence. We therefore propose the new combination Pleioblastus munsuensis (Y. N. Lee) A. Gantsetseg, Y. J. Jang, E. K. Han & J. H. Lee. Taken together, these findings highlight plastid-nuclear conflict in Arundinarieae, with hybridization likely contributing to phylogenetic instability, and indicate that certain taxa remain in need of species-level taxonomic re-evaluation, either due to hybrid origins or to nomenclatural uncertainty.
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