Abstract Detail

Genetics Section

Shi, Tao [1], Barker, Michael S. [1].

Paleopolyploidy and diversification of Actinidiaceae and related Ericales.

Analyses of plant genomes suggest that ancient polyploidy may have led to a dramatic increase in diversity in several angiosperm lineages. However, additional genomic analyses are needed to precisely locate ancient polyploidy in the plant phylogeny and assess the contribution of genome multiplication to correlated radiations. Previously, we demonstrated three ancient genome duplications in Actinidia (kiwifruit). Using newly generated Illumina transcriptome data (~1GB/species), we sampled each genus of the Actinidiaceae (Actinidia, Clematoclethra, and Saurauia) and their closest families in Ericales including two carnivorous families- Roridulaceae and Sarraceniaceae, and ornamental plants among the Ericaceae. Analyses of gene families among these species support our previous results with one paleopolyploidy in the ancestry of extant Actinidiaceae species (Ad-α), another ancient polyploidy shared by all the species we sequenced as well as Camellia sinensis (Ad-β), and the well-established At-γ WGD that occurred prior to the divergence of all taxa examined. Preliminary analyses indicate significantly faster rates of species diversification were found in Actinidiaceae correlated with the most recent WGD (Ad-α) than those without, i.e. Roridulaceae and Sarraceniaceae. Ongoing research is directed towards identifying the novel contribution of paleopolyploid-derived genes to the Actinidiaceae genome and identifying candidates associated with diversification. These results represent one of the first case studies of paleopolyploidy and diversification where members of all involved clades are represented by genomic data, and kiwifruit may serve as a model system for studying polyploidy and diversification among angiosperms.

Broader Impacts:

1 - University of Arizona, Ecology & Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, USA

Keywords:
Polyploidy
Actinidia
Ericales
genomics
Illumina
carnivorous
diversification.

Presentation Type: Oral Paper:Papers for Sections
Session: 39
Location: Lindell C/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 8:30 AM
Number: 39003
Abstract ID:348