Assembling the Tree of the Monocotyledons: Plastome Sequence Phylogeny and Evolution of Poales 1

作者：Thomas J. Givnish, Mercedes Ames, Joel R. McNeal, Michael R. McKain, P. Roxanne Steele, Claude W. dePamphilis, Sean W. Graham, J. Chris Pires, Dennis Wm. Stevenson, Wendy B. Zomlefer, Barbara G. Briggs, Melvin R. Duvall, Michael J. Moore, Jude Heaney, Pamela S. Soltis, Pamela S. Soltis, Kevin R. Thiele, James H. Leebens-Mack · 发表于：Annals of the Missouri Botanical Garden · 年份：2010 · DOI：10.3417/2010023 · 被引用次数：233 · 研究领域：Plant Diversity and Evolution、Plant and animal studies、Plant and Fungal Species Descriptions

The order Poales comprises a substantial portion of plant life (7% of all angiosperms and 33% of monocots) and includes taxa of enormous economic and ecological significance. Molecular and morphological studies over the past two decades, however, leave uncertain many relationships within Poales and among allied commelinid orders. Here we present the results of an initial project by the Monocot AToL (Angiosperm Tree of Life) team on phylogeny and evolution in Poales, using sequence data for 81 plastid genes (exceeding 101 aligned kb) from 83 species of angiosperms. We recovered highly concordant relationships using maximum likelihood (ML) and maximum parsimony (MP), with 98.2% mean ML bootstrap support across monocots. For the first time, ML resolves ties among Poales and other commelinid orders with moderate to strong support. Analyses provide strong support for Bromeliaceae being sister to the rest of Poales; Typhaceae, Rapateaceae, and cyperids (sedges, rushes, and their allies) emerge next along the phylogenetic spine. Graminids (grasses and their allies) and restiids (Restionaceae and its allies) are well supported as sister taxa. MP identifies a xyrid clade (Eriocaulaceae, Mayacaceae, Xyridaceae) sister to cyperids, but ML (with much stronger support) places them as a grade with respect to restiids graminids. The conflict in resolution between these analyses likely reflects long-branch attraction and highly elevated substitution rates in some Poales. All other familial r...