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Systematics Section / ASPT

Timme, Ruth [1], Kuehl, Jennifer V. [2], Boore, Jeffrey L. [2], Jansen, Robert K. [1].

The first sequenced chloroplast genomes in the Asteraceae: A comparison of Sunflower and Lettuce.

The chloroplast genomes of Helianthus annuus (sunflower) and Lactuca sativa (lettuce) are being sequenced. Draft genomes sequences that cover over 98% of these genomes are complete and finishing is in progress. Both genomes are about 160kb, which is average size in flowering plants. When compared to Tobacco, both genomes have two inversions: a large 22.8 kb inversion and a smaller 3.3 kb inversion nested within it. Previous studies showed that these inversions are shared across the family, but are lacking in the subfamily Barnadesioideae. EST databases for both of these taxa have enabled us to examine RNA editing in these genomes. Further comparisons of these two genomes provide the first large-scale examination of sequence divergence at the whole genome level between two divergent tribes of Asteraceae, Lactuceae and Heliantheae. This information will be valuable for selecting variable regions of the chloroplast genome for future phylogenetic and population studies in the family.


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1 - University of Texas Austin, Section of Integrative Biology, 1 University Station, A6700, Austin, Texas, 78712-7640, USA
2 - DOE Joint Genome Institute, Department of Evolutionary Genomics, 2800 Mitchell Drive, Walnut Creek, California, 94598, USA

Keywords:
Helianthus
Lactuca
Chloroplast genome
sunflower
lettuce.

Presentation Type: Poster
Session: 33-110
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:413


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