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Abstract Detail

Systematics Section

Spooner, David M. [1], Ames, Mercedes [2], Fajardo, Diego [3], Rodriguez, F. [4].

Species boundaries and interrelationships of Solanum sect. Petota (wild and cultivated potatoes) are drastically altered as a result of PBI-funded research.

In 1990, the latest comprehensive taxonomic monograph of Solanum section Petota Dumort. recognized 236 species partitioned into 21 series. Of these, 227 were tuber-bearing and nine non-tuber-bearing. NSF PBI-sponsored research has drastically altered knowledge of their species boundaries and interrelationships. The series contains diploids (2n = 2x = 24), tetraploids (2n = 4x= 48), and hexaploids (and rare triploids and pentaploids). We have approached problems of species boundaries and interrelationships of sect. Petota with morphological phenetics in replicated field trials in the US and Peru, field studies in natural habitats, AFLPs, plastid DNA restriction site data and plastid deletion data, DNA sequences of nuclear orthologs waxy, nitrate reductase, and conserved orthologous set (COSII) markers, and herbarium specimen data, including an examination of nearly all type specimens. Three species Hawkes placed in sect. Petota are now removed to sect. Etuberosum (Buk. & Kameraz) Child (S. etuberosum Lindl., S. fernandezianum Phil., S. palustre Poepp.), two species removed to sect. Lycopersicoides (A. Child) Peralta (S. lycopersicoides Dunal, S. sitiens I. M. Johnston), and two species to section Juglandifolia (Rydberg) A. Child (S. juglandifolium Dunal, S. ochranthum Dunal). Within sect. Petota, most series are unsupported, replaced by a three clade classification), with some of the polyploids supported as allopolyploids with parents among these clades. Our final taxonomic treatment, in preparation in on-line form (http://www.nhm.ac.uk/solanaceaesource), and as printed monographs, is recognizing less than half (110) of the 227 tuber-bearing species of Hawkes, with great reductions in the the traditionally recognized series Conicibaccata and the Solanum brevicaule complex. These comprehensive treatments are encompassing all components of traditional monographs, to include keys, synonyms, typifications, descriptions, images of representative types, distribution maps, line drawings of all recognized species, and over 15,500 locality records of herbarium specimens.

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1 - USDA, Agricultural Research Service, Horticulture, University of Wisconsin, 1575 Linden Drive, Madison, WI, 53706-1590, U.S.A.
2 - University of Wisconsin, Botany, 430 Lincoln Dr, Madison, WI, 53706, USA
3 - University of Wisconsin - Madison, Department of Horticulture, 1575 Linden Dr., Madison, WI, 53706, USA
4 - University of Wisconsin Madison, Horticulture Department, 1575 Linden Dr., Madison, Wisconsin, 53706-1590, USA


Presentation Type: Oral Paper:Papers for BSA Sections
Session: 47
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 4:30 PM
Number: 47014
Abstract ID:24