Systematics Section / ASPT
Pfeil, Bernard E. , Bayer, Randall J. .
Assessing hybridisation, lineage sorting and rapid radiation in Citrus.
The taxonomy and phylogeny of Citrus has been a challenge probably for the following reasons: a 4,000 year history of human cultivation, hybridisation and selection (especially of somatic mutations); unusual reproductive biology, such as clonal reproduction via nucellar embryogenesis; a fairly recent radiation of the main genetic diversity; and the ability to hybridise with related genera. This talk will focus on advances in understanding the phylogeny. Studies using one or two cpDNA regions found little phylogenetic resolution, but with many regions added and clear improvements obtained, not all relationships are resolved. Therefore, rapid radiation is suggested. However, untangling the effects of lineage sorting from rapid radiation requires further examination. Nuclear DNA phylogenies have the power to capture both parental lineages of hybridisation events, as well as provide insight into the scope of lineage sorting via coalescence methods.
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1 - CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia
2 - University of Memphis, Department of Biology, 3774 Walker Avenue, Memphis, TN, 38152, USA
Low-copy Nuclear Markers
Presentation Type: Oral Paper:Papers for Sections
Location: International Ballroom South/Hilton
Date: Wednesday, July 11th, 2007
Time: 3:00 PM