Fajardo, Diego , Spooner, David M. .
Species boundaries and interrelationships of Solanum series Conicibaccata.
Solanum series Conicibaccata Bitter previously contained 40 wild potato (sect. Petota Dumort.) species distributed from southern Mexico to central Bolivia. It contained diploids (2n = 2x = 24), tetraploids (2n = 4x= 48) and hexaploids (2n = 6x = 72). We previously reported the morphological phenetics of this group, and here report our final taxonomic decisions based on prior morphological data, plastid DNA restriction site data, AFLPs, herbarium specimens, and five nuclear ortholog (COSII) DNA sequences (concatenated length 5158 bp). The morphological study shows low resolution among the species. While the nuclear orthologs also show low resolution for the species, they clearly show the diploids to be members of “clade 4” species related to cultivated potato, and show allopolyploid origins for the tetraploids and hexaploids from the diploids and members of “clade 3” species containing members of series Piurana Hawkes and other related species. Low bootstrap support values among the species suggest very recent origins. Combined data lead us to recognize only 17 species: S. ayacuchense Ochoa, S. buesii Vargas, S. bombycinum Ochoa, S. burkartii Ochoa, S. colombianum Dunal, S. flahaultii Bitter, S. garcia-barrigae Ochoa, S. laxissimum Bitter, S. limbaniense Ochoa, S. lobbianum Bitter, S. longiconicum Bitter, S. neovavilovii Ochoa, S. nubicola Ochoa, S. oxycarpum Schiede, S. pillahuatense Vargas, S. salasianum Ochoa,and S. violaceimarmoratum Bitter. Other species that were previously considered as members of series Conicibaccata (S. chomatophilum Bitter and S. paucijugum Bitter) now are placed inside an expanded series Piurana. Solanum colombianum is by far the most widely distributed and polymorphic polyploid member of the series, composed of both tetraploid cytotypes (including 12 previously recognized species), and the hexaploid cytotypes S. moscopanum, S. sucubunense and S. tundalomense.
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1 - University of Wisconsin - Madison, Department of Horticulture, 1575 Linden Dr., Madison, WI, 53706, USA
2 - USDA, Agricultural Research Service, Horticulture, University of Wisconsin, 1575 Linden Drive, Madison, WI, 53706-1590, U.S.A.
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 4:00 PM