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Abstract Detail

Systematics Section / ASPT

Ames, Mercedes [1], Salas, Alberto [2], Spooner, D. M. [3].

The discovery and taxonomic implications of a novel 41 bp chloroplast DNA deletion in wild potatoes.

A 241-bp chloroplast deletion in the intergenic region flanking the 3'end of the trn V-UAC gene has been shown to have major phylogenetic importance in determining the origin of the cultivated potato, as it characterizes most landrace populations from lowland Chile and putative wild species in Bolivia and Argentina, but not landraces from the Andes from Venezuela to northern Argentina. We screened 199 accessions of 38 wild potato species in eight of the 19 tuber-bearing (Solanum section Petota) series that have not been examined before for this deletion as part of a comprehensive taxonomic reevaluation of section Petota. A novel (41 bp) deletion was discovered in this region for 30 accessions of three species: S. chiquidenum (5 of 10 accessions), S. chomatophilum (18 of 28), and S. jalcae (7 of 7), but no 241-bp deletion was found. Accessions with this deletion, and accessions without the deletion, are found throughout the north-south range of all three species in northern and central Peru, but not east of the Marañón River. Multivariate morphological analyses of these 45 accessions shows there to be no morphological associations to the deletion. Solanum chomatophilum and S. jalcae are so similar as to possibly be conspecific, but S. chiquidenum is clearly distinctive, and current phylogenetic interpretations have never suggested these three species to be related.

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1 - University of Wisconsin - Madison, Horticulture, 1575 Linden Dr, Madison, Wisconsin, WI 53706, USA
2 - International Potato Center, Lima, Peru
3 - USDA-ARS, University of Wisconsin, Department of Horticulture, 1575 Linden Drive, Madison, Wisconsin, 53706, USA

Sect. Petota
chloroplast DNA.

Presentation Type: Oral Paper:Papers for Sections
Session: CP05
Location: Lake Erie/Hilton
Date: Monday, July 9th, 2007
Time: 11:00 AM
Number: CP05011
Abstract ID:1527

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