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(American Journal of Botany. 2001;88:1888-1902.)
© 2001 Botanical Society of America, Inc.

Systematics

Granule-bound starch synthase (GBSSI) gene phylogeny of wild tomatoes (Solanum L. section Lycopersicon [Mill.] Wettst. subsection Lycopersicon)1

Iris E. Peralta2 and David M. Spooner3

Vegetable Crops Research Unit, USDA, Agricultural Research Service, Department of Horticulture, University of Wisconsin, 1575 Linden Drive, Madison, Wisconsin 53706-1590 USA

Eight wild tomato species are native to western South America and one to the Galapagos Islands. Different classifications of tomatoes have been based on morphological or biological criteria. Our primary goal was to examine the phylogenetic relationships of all nine wild tomato species and closely related outgroups, with a concentration on the most widespread and variable tomato species Solanum peruvianum, using DNA sequences of the structural gene granule-bound starch synthase (GBSSI, or waxy). Results show some concordance with previous morphology-based classifications and new relationships. The ingroup comprised a basal polytomy composed of the self-incompatible green-fruited species S. chilense and the central to southern Peruvian populations of S. peruvianum, S. habrochaites, and S. pennellii. A derived clade contains the northern Peruvian populations of S. peruvianum (also self-incompatible, green-fruited), S. chmielewskii, and S. neorickii (self-compatible, green-fruited), and the self-compatible and red- to orange- to yellow-fruited species S. cheesmaniae, S. lycopersicum, and S. pimpinellifolium. Outgroup relationships are largely concordant with prior chloroplast DNA restriction site phylogenies, support S. juglandifolium and S. ochranthum as the closest outgroup to tomatoes with S. lycopersicoides and S. sitiens as basal to these, and support allogamy, self-incompatibility, and green fruits as primitive in the tomato clade.

Key Words: GBSSI • Lycopersicon • phylogeny • Solanaceae • Solanum sect. Lycopersicon • tomato • waxy gene




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