| Abstract Detail
Molecular Ecology and Evolution Fay, Michael F. [1], Leitch, Ilia J. [1], Beaulieu, Jeremy M. [2], Lysak, Martin A. [3]. Punctuated genome size evolution in Liliaceae. Most angiosperms possess small genomes (mode 1C = 0.6 pg, median 1C = 2.9 pg). Those with truly enormous genomes (i.e., >35 pg) are phylogenetically restricted, occurring in a few families (mostly monocots), including Liliaceae. This family exhibits a wide range in genome size, with species possessing some of the largest genomes so far reported for any plant and others possessing much smaller genomes. To gain insights into when and where genome size change/expansion took place during the evolution of Liliaceae and the mode and tempo of this change, data for 78 species were superimposed onto a phylogenetic tree and analysed. Results suggest genome size in Liliaceae followed a punctuated rather than gradual mode of evolution and that most of the diversification evolved recently rather than early in the evolution of the family. We consider that the large genome sizes of Liliaceae may have emerged passively rather than as a result of selection.
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Related Links:
Plant DNA C-values Database
1 - Royal Botanic Gardens, Kew, Jodrell Laboratory, Richmond, Surrey, TW9 3AB, United Kingdom
2 - California Polytechnic State University San Luis Obispo, Biological Sciences, 1 Grand Ave, San Luis Obispo, CA, 93407, USA
3 - Masaryk University, Department of Functional Genomics and Proteomics, Kamenice 5, Building A2, Brno, 62500, Czech Republic
Keywords:
genome size
evolution
Liliaceae
Fritillaria
phylogenetics
Selection.
Presentation Type: Oral Paper:Papers for Topics
Session: CP41
Location: Boulevard B/Hilton
Date: Wednesday, July 11th, 2007
Time: 11:00 AM
Number: CP41011
Abstract ID:1617 |
