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Abstract Detail

Crops and Wild Relatives

SPOONER, DAVID [1], Ruess, Holly [2], Arbizu, Carlos [2], Rodríguez, Flor [3], Solis-Lemus, Claudia [4].

Greatly reduced phylogenetic structure in the cultivated potato clade of Solanum section Petota.

The species boundaries of Solanum section Petota are complicated by interspecific hybridization, introgression, allopolyploidy, a mixture of sexual and asexual reproduction, and possible recent species divergence. Every taxonomist who approaches the taxonomy of the group has provided different hypotheses of the number of species and their interrelationships. A recent taxonomic conspectus in 2014 recognized 107 species in section Petota, less than half as many as a treatment in 1990 that recognized 232 species. The group has been studied by morphological and molecular techniques from isozymes, a variety of DNA markers types, and most recently by the use of multiple nuclear orthologs. We here report a phylogenetic analysis of 131 diploid species accessions, using 12 nuclear orthologs, distributed on six of the 12 linkage groups, producing an aligned dataset of 14072 DNA characters, 2171 of which are parsimony informative. The results quantify relatively good phylogenetic structure (as assessed by high bootstrap values and well-resolved branches) in clades traditionally referred to in the potato literature as clades 1+2, 3, and an additional “basal” clade, but drastically reduced phylogenetic structure (as assessed by polytomies, low bootstrap support, and the failure of all species to resolve in species-specific clades) in the clade 4, containing cultivated potatoes and their immediate and close wild relatives. We are using a concordance analysis and goodness-of-fit test in order to investigate whether hybridization is the cause of the taxonomic problems in clade 4.

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1 - USDA Agricultural Research Service, Horticulture, Univ. Wisconsin, 1575 Linden Drive, Madison, WI, 53706, USA
2 - USDA Agricultural Research Service, Univ. Wisconsin, 1575 Linden Drive, Madison, WI, 53706, United States
3 - International Potato Center, P.O. Box 1558, Lima 12, Peru
4 - University of Wisconsin, Botany, Madison, WI, 53706, USA

conserved orthologus sequences (COS).

Presentation Type: Oral Paper
Session: 39, Crops and Wild Relatives
Location: Sundance 2/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 2:45 PM
Number: 39006
Abstract ID:227
Candidate for Awards:None

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