Phylogenetic Relationships in Solanum Section Androceras (Solanaceae)

Phylogenetic Relationships in Solanum Section Androceras (Solanaceae)

The Leptostemonum clade of Solanum contains approximately 350–450 species, including the cultivated eggplant, S. melongena. This clade is characterized by the presence of prickles and apically attenuate anthers. Solanum section Androceras, the focus of this study, is a group of ca. 12 species belong...

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Bibliographic Details
Published in:Systematic botany Vol. 35; no. 4; pp. 885 - 893
Main Authors: Stern, Stephen R, Weese, Terri, Bohs, Lynn A
Format: Journal Article
Language:English
Published: American Society of Plant Toxonomists 01-10-2010
American Society of Plant Taxonomists
Subjects:
Biological taxonomies
chemotaxonomy
chloroplast DNA
color
Datasets
Enantiostyly
Flavonoids
Flowers
Genetic aspects
geographical distribution
Heteranthery
ITS
Melongena
Mexico
molecular sequence data
molecular systematics
Monophyly
nuclear genome
nucleotide sequences
Parsimony
Phylogenetics
Phylogeny
Physiological aspects
plant morphology
plant taxonomy
Plants
ribosomal DNA
sequence analysis
Solanaceae
Solanum
Solanum tenuipes
Taxa
trichomes
Trnt-F
Waxy
United States
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Summary:The Leptostemonum clade of Solanum contains approximately 350–450 species, including the cultivated eggplant, S. melongena. This clade is characterized by the presence of prickles and apically attenuate anthers. Solanum section Androceras, the focus of this study, is a group of ca. 12 species belonging to the Leptostemonum clade. This section is unusual in the genus because of its mostly north temperate distribution and distinctive zygomorphic, heterantherous, and enantiostylous flowers. We infer phylogenetic relationships among 43 Solanum taxa, including 11 species and all varieties of sect. Androceras, using DNA sequence data from two nuclear regions (ITS and the granule-bound starch synthase gene [GBSSI or waxy]) and the chloroplast region trnT-F. The combined phylogenetic tree supports sect. Androceras as a monophyletic group sister to Solanum sect. Crinitum. Only one of the three series proposed by previous taxonomists, ser. Pacificum, is supported as monophyletic. Solanum tenuipes from the northern Chihuahua Desert is sister to the remaining species in sect. Androceras. Species-level relationships were also examined and it was found that two species, S. heterodoxum and S. citrullifolium, are not monophyletic. The ancestral flower color in sect. Androceras appears to be violet, with white and yellow flowers restricted to more derived clades. Characters formerly used to diagnose ser. Androceras, such as exclusively branched hairs and lack of complex foliar flavonoids, appear to have evolved more than once in the section.
Bibliography:http://dx.doi.org/10.1600/036364410X539934
0363-6445(20101201)35:4L.885;1-
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0363-6445
1548-2324
DOI:10.1600/036364410X539934