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Abstract Detail


Economic Botany: Evolution of Cultivated Plants

Spooner, D. M. [1], Ghislain, Marc [2], Núñez, Jorge [3], Trujillo, Guillermo [3], del Rosario Herrera, Maria [3], Guzmán, Frank [3].

What is a species of cultivated potato?

The cultivated potato is one of the most important food plants worldwide, yet knowledge of the gene pool structure of the native South American landraces remains largely uninvestigated and is controversial. As a result, contrasting taxonomic treatments of the landraces have continued over last century, with the recognition of anywhere from one to twenty distinct Linnean species, or Cultivar Groups within the single species Solanum tuberosum. We provide a nuclear microsatellite study of 745 landraces of all cultivated species (or Cultivar groups), and eight closely related wild species progenitors, with 50 primer pairs and a plastid DNA deletion marker that has been considered to distinguish Chilean from Andean tetraploid landraces. Neighbor joining results highlight a tendency to separate three groups: 1) putative diploids, 2) putative tetraploids, the hybrid Cultivar Groups Ajanhuiri (diploid), Juzepczukii (triploid), and Curtilobum (pentaploid). The triploid Chaucha Group landraces are widely scattered in both “diploid” and “tetraploid” clusters. However, there are many exceptions of clustering by ploidy and Cultivar Group. Strong bootstrap support occurs only in branches of the Groups Ajanhuiri, Juzepczukii, and Curtilobum. In combination with recent morphological analyses and an examination of the identification history of these collections, we conclude that only Groups Ajanhuiri, Juzepczukii, and Curtilobum are well-defined. For the remaining accessions, consistent and stable identifications are impossible, and their classification as Linnean species is artificial and only serves to maintain confusion in genebanks and in the literature. We rather support their classification as user-defined Cultivar Groups, but variation among the collection makes even this goal difficult.


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1 - USDA-ARS, University of Wisconsin, Department of Horticulture, 1575 Linden Drive, Madison, Wisconsin, 53706, USA
2 - International Potato Center (CIP), PO Box 1558, Lima 12, Peru
3 - International Potato Center (CIP), PO Box 1558, Lima 12, Peru

Keywords:
cultivated
microsatellites
Cultivar Group
Potato (Solanum tuberosum)
Solanaceae.

Presentation Type: Oral Paper:Papers for Topics
Session: CP03
Location: Lake Ontario/Hilton
Date: Monday, July 9th, 2007
Time: 8:00 AM
Number: CP03001
Abstract ID:886


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