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Abstract Detail


Systematics Section / ASPT

Hansen, Katie [1], Blazier, Chris [2], Rehman, Sumaiyah [3], Kuehl, Jennifer V. [4], Boore, Jeffrey L. [5], Jansen, Robert K. [6].

Comparative Chloroplast Genomics in Passiflora.

Passiflora is a genus nearly 530 species of climbing herbs, woody lianas and shrubs. It is primarily a Neotropical group, however a few species are confined to the Old World in Southeast Asia and Australia. The two largest groups in the genus correspond to subgenera Decaloba and Passiflora (circa 200 sp each). Subgenus Decaloba are primarily herbaceous vines with small flowers and a haploid chromosome number of x=6. Subgenus Passiflora on the other hand, are woody lianas with large, showy flowers, edible fruit and a haploid chromosome number of x=9. Of the two remaining subgenera, Astrophea (52 species) are woody lianas or shrubby trees and Deidamioides (15 species) is probably a paraphyletic group several lineages. Several phylogenies have been published in the last few years using a variety of molecular markers. While the phylogenetic signal is strong, wide-spread reticulation has hampered the determination of species relationships. Here we present the first full chloroplast genomic sequences for Passiflora. There are dramatic differences in gene order and chloroplast genome structure in the X=9 (Subgenus Passiflora) and X=6 ( Subgenus Decaloba) groups. The x=6 group has a very large extension of the inverted repeat, which is completely absent in the x=9 group. In addition, gene order between the groups is quite distinct. These very divergent chloroplast genomic structures will provide several new phylogenetic characters for this genus. A PCR survey of the entire genus for these structural differences is in process and hopefully will provide new clues into the relationships between these four subgenera.


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1 - University of Texas at Austin, School of Biological Sciences, 1 University Station A6700, Austin, Texas, 78712-7640, USA
2 - University of Texas at Austin, Section of Integrative Biology, 1 University Station A6700, Austin, Texas, 78712-7640, USA
3 - University of Texas at Austin, Section of Integrative Biology, 1 University Station, #A6700, Austin, TX, 78712, USA
4 - DOE Joint Genome institute, 2800 Mitchell Drive, Walnut Creek, CA, 94598, USA
5 - DOE Joint Genome Institute, Department of Evolutionary Genomics, 2800 Mitchell Drive, Walnut Creek, California, 94598, USA
6 - University of Texas Austin, Section of Integrative Biology, 1 University Station, A6700, Austin, Texas, 78712-7640, USA

Keywords:
Passiflora
genomics
Chloroplast
systematics.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P59028
Abstract ID:2274


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