Triplett, Jimmy K. , Clark, Lynn G. .
Molecular phylogenetics of Pleioblastus sensu stricto (Poaceae: Bambusoideae) and allies in the Japanese Archipelago.
The bamboo genus Pleioblastus sensu stricto encompasses approximately 19 species native to Japan and is characterized by a suite of morphological features including extensive secondary branching and persistent culm leaves. The genus is commonly synonymized with Arundinaria (a North American endemic), but recent molecular evidence clearly distinguishes these genera while revealing complex associations among sympatric East Asian taxa. Pleioblastus and allies form a clade that includes the Sinicae complex (Acidosasa, Indosasa, Pleioblastus sect. Amari, Pseudosasa subg. Sinicae) of Mainland China and Pleioblastus s.s. of Japan. To further explore the phylogeny of the Japanese lineage, we utilized AFLP markers and cpDNA sequence data (rps16-trnQ, trnC-rpoB, trnD-trnT, trnT-trnL) and expanded taxon sampling to include individuals from multiple natural populations. Two major cpDNA lineages were identified: the Ryukyu clade (ca. 4 spp.), within which the type species of Pseudosasa was nested, and the Medakea + Nezasa clade (ca. 15 spp.), within which Semiarundinaria and several species of Sasaella were nested. Genotypic evidence revealed these nested genera to be intergeneric hybrids involving Pleioblastus and species in Sasamorpha, Phyllostachys, and Sasa. Molecular data also provided species-level resolution within Pleioblastus s.s., indicating relatively low genetic diversity in some widespread species, high diversity in some narrow endemics, and numerous cryptic hybrids. Although a number of species were clearly monophyletic, molecular data failed to provide straightforward solutions to many taxonomic problems in this genus, instead highlighting a complex genetic network consistent with incomplete lineage sorting or recurrent introgression. Additional phylogenetic and biogeographic characteristics of Pleioblastus s.s. will be discussed in relation to other genera of temperate woody bamboos.
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1 - University of Missouri-St. Louis, Department of Biology, One University Boulevard, St. Louis, Missouri, 63121, USA
2 - Iowa State University, Department of Ecology, Evolution & Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood D/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 3:30 PM