Phylogeny, molecular and fossil dating, and biogeographic history of Annonaceae and Myristicaceae (Magnoliales)

Doyle, J. A., Sauquet, H., Scharaschkin, T. and Le Thomas, A. (2004) Phylogeny, molecular and fossil dating, and biogeographic history of Annonaceae and Myristicaceae (Magnoliales). International Journal of Plant Sciences, 165 4 Suppl.: S55-S67. doi:10.1086/421068

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Author Doyle, J. A.
Sauquet, H.
Scharaschkin, T.
Le Thomas, A.
Title Phylogeny, molecular and fossil dating, and biogeographic history of Annonaceae and Myristicaceae (Magnoliales)
Journal name International Journal of Plant Sciences   Check publisher's open access policy
ISSN 1058-5893
Publication date 2004-07
Sub-type Article (original research)
DOI 10.1086/421068
Open Access Status File (Publisher version)
Volume 165
Issue 4 Suppl.
Start page S55
End page S67
Total pages 13
Place of publication Chicago, IL, United States
Publisher University of Chicago Press
Collection year 2004
Language eng
Abstract Annonaceae and Myristicaceae, the two largest families of Magnoliales, are pantropical groups of uncertain geographic history. The most recent morphological and molecular phylogenetic analyses identify the Asian-American genus Anaxagorea as sister to all other Annonaceae and the ambavioids, consisting of small genera endemic to South America, Africa, Madagascar, and Asia, as a second branch. However, most genera form a large clade in which the basal lines are African, and South American and Asian taxa are more deeply nested. Although it has been suggested that Anaxagorea was an ancient Laurasian line, present data indicate that this genus is basically South American. These considerations may mean that the family as a whole began its radiation in Africa and South America in the Late Cretaceous, when the South Atlantic was narrower, and several lines dispersed from Africa-Madagascar into Laurasia as the Tethys closed in the Tertiary. This scenario is consistent with the occurrence of annonaceous seeds in the latest Cretaceous of Nigeria and the Eocene of England and with molecular dating of the family. Based on distribution of putatively primitive taxa in Madagascar and derived taxa in Asia, it has been suggested that Myristicaceae had a similar history. Phylogenetic analyses of Myristicaceae, using morphology and several plastid regions, confirm that the ancestral area was Africa-Madagascar and that Asian taxa are derived. However, Myristicaceae as a whole show strikingly lower molecular divergence than Annonaceae, indicating either a much younger age or a marked slowdown in molecular evolution. The fact that the oldest diagnostic fossils of Myristicaceae are Miocene seeds might be taken as evidence that Myristicaceae are much younger than Annonaceae, but this is implausible in requiring transoceanic dispersal of their large, animal-dispersed seeds.
Keyword Plant Sciences
Molecular Dating
Divergence Times
Seed Dispersal
Basal Angiosperms
Flowering Plants
Absolute Rates
18s Rdna
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2005 Higher Education Research Data Collection
School of Biological Sciences Publications
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Created: Wed, 15 Aug 2007, 03:13:40 EST