| Abstract Detail
Monday Afternoon Morphology and Taxonomy Dillon, Michael [1], Soejima, Akiko [2], Yi, Tingshuang [1], Nie, Zelong [3], Wen, Jun [3]. Phylogeny of Nolana (Solanoideae-Solanaceae) as inferred from the GBSSI marker: Implications for biogeography and character evolution in the fourth largest genus in the family. PHYLOGENETIC relationships of Nolana (Solanoideae-Solanaceae) were constructed using partial sequences (ca. 930 bp) of the granule-bound starch synthase I (GBSSI) or the waxy gene. Species diversity in Nolana is nearly equally divided between Chile (44 spp.) and Peru (37 spp.), four (4) found in both countries, and one from the Galapagos Islands. With no fewer than 86 species, Nolana is here considered the fourth largest genus in the Solanaceae. Our sampling scheme included 63 of the 86 species of Nolana from Chile, Peru, and the Galapagos Islands, representing both coastal and inland (high-elevation) habitats. This sampling also covered the morphological diversity of the genus such as annual and perennial herbs and shrubs with a variety of leaf and floral morphology, and ecological preferences. Our phylogenetic analysis suggests three major clades (100% bootstrap support) within the genus: (1) a basally branching Nolana sessiliflora; (2) a strongly supported large clade, containing taxa from Chile, Peru, and the Galapagos Islands, and (3) another major clade containing taxa from Chile and Peru. Nolana galapagensis, an endemic to the Galapagos Islands, is sister to N. adansonii from southern Peru and northern Chile. This sister-group relationship was unexpected given that the two species differ substantially in growth habit and leaf and mericarp morphology. The upland species of Nolana have been derived independently several times from the coastal deserts. The Peruvian species have radiated twice from different Chilean ancestors.
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1 - The Field Museum, Botany, 1400 South Lake Shore Drive, Chicago, IL, 60605, USA
2 - Osaka Prefecture University, College of Integrated Arts and Sciences, Sakai, Osaka, 599-8531, Japan
3 - Smithsonian Institution, Botany, mrc-166, Post Office Box 37012, Washington, D. C., 20013-7012, USA
Keywords:
Nolana
Solanaceae
GBSSI-marker.
Session: SOL03-3
Location: Ballroom AB/Monona Terrace
Date: Monday, July 24th, 2006
Time: 2:30 PM
Abstract ID:406 |
