Bryological and Lichenological Section/ABLS
Goffinet, Bernard , Wickett, Norman J. , Shaw, A.J. , Ros Espin, Rosa M. , Werner, Olaf .
Refining the circumscription of the Funariales (Bryophyta) based on chloroplast genome structure.
THE Funariales comprise three families: Funariaceae, Disceliaceae and Gigaspermaceae. The order shares a common ancestor with the Encalyptales. The monophyly of the Funariales lacks support from either morphological characters due to severe reduction and character loss across all families, or from sequence data, which tend to resolve the order as paraphyletic around the Encalyptales. Inferences from nucleotide sequences indeed suggest, albeit with no support that the Gigaspermaceae are sister to the remainder of the Funariales and Encalyptales. The chloroplast genome of Physcomitrella (Funariaceae) is characterized by the lack, following the transfer to the nucleus, of the rpoA gene and a 71 kb inversion in the large single copy unit. The large inversion was initially considered unique to Physcomitrella, but is here shown to be shared by the Funariaceae, Disceliaceae and the Encalyptales. The Gigaspermaceae, however, lack the inversion: the genes occur in the plesiotypic order, common to all other mosses surveyed. Inversions are rare in the chloroplast genome, and the 71 kb inversion shared by Funariales s. str. and Encalyptales is interpreted here as having occurred once, in the ancestor shared by the Funariaceae, Disceliaceae and Encalyptales. The phylogenetic distribution of the inversion supports the hypothesis that the Funariales s. lat. are polyphyletic. The Gigaspermaceae should be excluded from the Funariales and accommodated in their own order.
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1 - University of Connecticut, Ecology & Evolutionary Biology, 75 North Eagleville Road, U-3043, Storrs, Connecticut, 062693043, USA
2 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
3 - Universidad de Murcia, Biologia vegetal, Facultad de Biologia, Campus de Espinardo, Murcia, 30100, Spain
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 11:00 AM