Triplett, Jimmy , Clark, Lynn , Wen, Jun .
Three nuclear loci resolve the polyploid history of the bamboos.
The true bamboos (Poaceae: Bambusoideae) encompass over 1400 species worldwide and represent the single major grass lineage to diversify in association with forest habitats. Recent molecular evidence suggests that contemporary bamboo diversity is the product of polyploidy events that predate the origin of major lineages, including the tropical bamboos (~783 spp.), the temperate bamboos (~533 spp.), and the herbaceous bamboos (~115 spp.). In the current investigation, three low-copy nuclear genes (gpa1, an endo-1,4-beta glucanase, and a poly-A binding protein) were used to reconstruct phylogenetic relationships within the bamboos in order to examine the origins of polyploidy. These data suggest that ancestral bamboo lineages experienced several episodes of hybridization and polyploidy resulting in independent origins of allopolyploid lineages. Subsequent diversification at the polyploid level produced species that are morphologically and ecologically distinct. Moreover, new species have been produced by ongoing hybridization among allopolyploids. This new evidence, combined with previous studies using chloroplast DNA and AFLPdata, reveals that hybridization and polyploidy have had important and recurrent roles in the evolution of the bamboos.
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1 - Jacksonville State University, 700 Pelham Road North, Jacksonville, AL, 36265, USA
2 - Iowa State University, Department Of Ecology, Evolution, And Organismal Biology, 251 Bessey Hall, Ames, IA, 50011-1020, USA
3 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, 10th St. & Constitution Ave., NW, MRC 166, Washington/DC, N/A, 20013-7012, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Franklin B/Hyatt
Date: Monday, July 9th, 2012
Time: 3:45 PM