© 2007 Society of Systematic Biologists
Untangling Complex Histories of Genome Mergings in High Polyploids
1 National Centre for Biosystematics, Natural History Museum, University of Oslo P.O. Box 1172 Blindern, NO-0318, Oslo, Norway E-mail: christian.brochmann{at}nhm.uio.no (C.B.)
2 Department of Systematic Botany, Evolutionary Biology Centre, Uppsala University SE-752 36, Uppsala, Sweden E-mail: bengt.oxelman{at}ebc.uu.se
3 School of Computing Sciences, University of East Anglia Norwich, NR4 7TJ, United Kingdom katharina.huber{at}cmp.uea.ac.uk(K.T.H.) vincent.moulton{at}cmp.uea.ac.uk (V.M.)
Edited by Susanne Renner: Associate Editor
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Abstract |
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Polyploidy, the duplication of entire genomes, plays a major role in plant evolution. In allopolyploids, genome duplication is associated with hybridization between two or more divergent genomes. Successive hybridization and polyploidization events can build up species complexes of allopolyploids with complicated network-like histories, and the evolutionary history of many plant groups cannot be adequately represented by phylogenetic trees because of such reticulate events. The history of complex genome mergings within a high-polyploid species complex in the genus Cerastium (Caryophyllaceae) is here untangled by the use of a network algorithm and noncoding sequences of a low-copy number gene. The resulting network illustrates how hybridization and polyploidization have acted as key evolutionary processes in creating a plant group where high-level allopolyploids clearly outnumber extant parental genomes.
Keywords: Allopolyploidy; low-copy number gene; network construction; reticulate evolution
Received October 27, 2006; Revised January 4, 2007; Accepted February 26, 2007
4 Present Address: Department of Biology, University of Oslo, P.O. Box 1066 Blindern, NO-0316, Oslo, Norway; E-mail: a.k.brysting{at}bio.uio.no
5 Present Address: Department of Plant and Environmental Sciences, Göteborg University, Box 461, SE-40530 Göteborg, Sweden; E-mail: bengt.oxelman{at}dpes.gu.se
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