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Economic Botany Section

Spooner, D. M. [1], McLean, Karen [2], Ramsay, Gavin [2], Waugh, Robbie [2], Bryan, Glenn [2].

A single domestication for potato based on multilocus AFLP genotyping.

The cultivated potato, Solanum tuberosum, ultimately traces its origin to Andean and Chilean landraces developed by pre-Colombian cultivators. These Andean landraces exhibit tremendous morphological and genetic diversity, and are distributed throughout the Andes, from western Venezuela to northern Argentina, and in southern Chile. The wild species progenitors of these landraces have long been in dispute, but all hypotheses center on a group of about 20 morphologically very similar tuber-bearing (Solanum section Petota) wild taxa referred to as the Solanum brevicaule complex, distributed from central Peru to northern Argentina. We present phylogenetic analyses based on representative cladistic diversity of 367 individual wild (275) and landrace (89) members of potato (all tuber-bearing) and three outgroup non-tuber-bearing members of Solanum section Etuberosum, genotyped with 438 robust Amplified Fragment Length Polymorphisms. Our analyses are consistent with a hypothesis of a "northern" (Peru) and "southern" (Bolivia and Argentina) cladistic split for members of the Solanum brevicaule complex, and with the need for considerable reduction of species in the complex. In contrast to all prior hypotheses our data support a monophyletic origin of the landrace cultivars from the northern component of this complex in Peru, rather than from multiple independent origins from various northern and southern members.


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1 - USDA-ARS, University of Wisconsin, Department of Horticulture, 1575 Linden Drive, Madison, Wisconsin, 53706, USA
2 - Scottish Crop Research Institute, Genome Dynamics Programme, Invergowrie, Dundee, DD2 5DA, United Kingdom

Keywords:
AFLP, domestication, potato, Solanum.

Presentation Type: Oral Paper
Session: 28-2
Location: 412/Hilton
Date: Tuesday, August 16th, 2005
Time: 8:45 AM
Abstract ID:70


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