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Abstract Detail

Systematics Section/ASPT

Massoni, Julien [1], Forest, Felix [2], Sauquet, Hervé [3].

Evolutionary history of a 10,000-species clade of angiosperms:reconstructing the phylogeny of magnoliids as a whole.

Large-scale phylogenetic studies conducted over the last two decades have clarified phylogenetic relationships at the base of the angiosperm tree. This new context led to the definition of a new early-diverging clade referred to as magnoliids or Magnoliidae. This monophyletic group is made up of four orders (Canellales, Piperales, Laurales,and Magnoliales) and 20 families, including well-known species such as avocado, pepper or nutmeg. The 10,000 species of Magnoliidae show considerable diversity of floral shapes. Despite the fact that this clade is supported by the great majority of large-scale phylogenetic studies based on molecular and morphological data, no detailed phylogenetic analysis of the group as a whole has been conducted yet. We sampled 241 species representing 92% of genus diversity within Magnoliidae, and 12 markers from the three genomes (chloroplastic: atpB,matK, trnL intron, trnL-trnF spacer, ndhF, rbcL; mitochondrial: atp1, matR, mtLSU, mtSSU; nuclear: 18S, 26S). Phylogenetic analyses using maximum parsimony, maximum likelihood, and Bayesian methods yield well resolved trees consistent with previous family-level and higher-level studies. Magnoliidae are separated in two clades: (Piperales+Canellales) and (Laurales+Magnoliales). On the other hand, our analyses resolved a number of long-standing polytomies. These results highlight the importance of a large taxonomic and molecular sample to resolve both deep and shallow phylogenetic relationships within Magnoliidae. This study is the first step toward a robust and accurate phylogenetic framework needed to reconstruct patterns of floral evolution in this clade.

Broader Impacts:

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1 - Universite Paris-Sud 11, Lab. Ecologie, Systematique, Evolution (ESE), CNRS UMR 8079, Bat. 360, Orsay, N/A, 91405, France
2 - Royal Botanic Gardens - Kew, Jodrell Laboratory, Richmond, Surrey, TW9 3DS, United Kingdom
3 - Universite Paris-Sud 11, CNRS UMR 8079, Bat. 360, Orsay, N/A, 91405, France

Molecular phylogeny.

Presentation Type: Oral Paper:Papers for Sections
Session: 54
Location: Delaware B/Hyatt
Date: Wednesday, July 11th, 2012
Time: 3:45 PM
Number: 54009
Abstract ID:503

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