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A single domestication for potato based on multilocus amplified fragment length polymorphism genotyping
David M Spooner1, Karen McLean, Gavin Ramsay
1U.S. Department of Agriculture, Agricultural Research Service, Department of Horticulture, University of Wisconsin, 1575 Linden Drive, Madison, WI 53706-1590, USA. dspooner@wisc.edu
Summary
Potato landrace origins were traced to the S. brevicaule complex. Phylogenetic analyses reveal a monophyletic origin in Peru, challenging previous hypotheses of multiple origins.
Area of Science:
- Botany
- Genetics
- Agricultural Science
Background:
- Cultivated potato (Solanum tuberosum) diversity originates from Andean and Chilean landraces.
- The wild progenitors are debated but center on the S. brevicaule complex.
- This complex displays significant morphological similarity and geographic distribution.
Purpose of the Study:
- To investigate the phylogenetic origins of potato landraces.
- To clarify the evolutionary relationships within the S. brevicaule complex.
- To test hypotheses regarding the origin of cultivated potatoes.
Main Methods:
- Phylogenetic analyses using cladistic diversity.
- Genotyping of 362 wild and landrace potato members.
- Utilized 438 amplified fragment length polymorphisms (AFLPs).
Main Results:
- Consistent with a northern (Peru) and southern (Bolivia, Argentina) cladistic split within the S. brevicaule complex.
- Suggests a significant reduction in species classification within the complex.
- Supports a single, monophyletic origin for landrace cultivars from northern Peru.
Conclusions:
- Potato landrace cultivars originated from a single ancestral group in northern Peru.
- This finding contrasts with prior hypotheses of multiple origins.
- Recommends a re-evaluation of species boundaries within the S. brevicaule complex.