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Genetics Section

Guisinger-Bellian, Mary M. [1], Boore, Jeffrey L. [2], Kuehl, Jennifer V. [2], Jansen, Robert K. [3].

Organization and evolution of the chloroplast genome of Erodium texanum (Geraniaceae).

The organization of chloroplast genomes in land plants is generally considered to be highly conserved with few if any changes in gene order and content. Some previously mapped and sequenced genomes in the flowering plant family Geraniaceae exhibit unusual structural changes, including expansion of the inverted repeat (IR), loss of the IR , inversions, and loss or inactivation of several genes. We are sequencing seven chloroplast genomes in the Geraniaceae and the outgroup Hypseocharis (Hypseocharitaceae). In this paper, we report on the progress of the genome sequence of Erodium texanum. Preliminary results indicate a drastic reduction in the size of the inverted repeat leading to a smaller genome than is typical of flowering plants. Relative to the completed genome of Pelargonium x hortorum (Geraniaceae), gene order and genome size of Erodium is significantly different, indicating substantial divergence within the family. Further comparisons of Erodium with other chloroplast genome sequences, especially that of Pelargonium, provide new insights into the mechanisms of chloroplast DNA evolution.


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1 - The University of Texas at Austin, Section of Integrative Biology, 1 University Station, A6720, Austin, Texas, 78712, USA
2 - DOE Joint Genome Institute, Department of Evolutionary Genomics, 2800 Mitchell Drive, Walnut Creek, California, 94598, USA
3 - Universtiy of Texas Austin, Section of Integrative Biology, 1 University Station, A6720, Austin, Texas, 78712, USA

Keywords:
Chloroplast genome
Genome evolution
Plastid DNA
Geraniaceae
Erodium texanum.

Presentation Type: Poster
Session: 33-51
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:148


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