Phylogenetic relationships in Polygalaceae based on plastid DNA sequences from the trnL-F region

Authors
Citation
C. Persson, Phylogenetic relationships in Polygalaceae based on plastid DNA sequences from the trnL-F region, TAXON, 50(3), 2001, pp. 763-779
Citations number
56
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
TAXON
ISSN journal
0040-0262 → ACNP
Volume
50
Issue
3
Year of publication
2001
Pages
763 - 779
Database
ISI
SICI code
0040-0262(200108)50:3<763:PRIPBO>2.0.ZU;2-F
Abstract
Seventy-three plastid DNA sequences from the trnL-F region were used to inf er phylogenetic relationships among Polygalaceae. The analysis indicates th at Xanthophyllum is the sister group to the remainder of genera in Polygala ceae. Monophyly of tribes Polygaleae and Carpolobieae is corroborated, wher eas monophyly of Moutabeae could not be confirmed. Although intergeneric re lationships within Polygaleae are poorly resolved, most traditional genera are corroborated as monophyletic. However, Polygala and Bredemeyera s.l. fo rm two exceptions and are grossly polyphyletic. Acanthocladus and Badiera ( incl. Hebecarpa), taxa often assigned to Polygala, are more closely related to Bredemeyera s.str. than to other Polygala. Likewise, Bredemeyera s.l. i s broadly polyphyletic since Comesperma and Bredemeyera colletioides (sect. Hualania) have their closest relatives among other genera. Furthermore, Hu alania is also polyphyletic since Bredemeyera microphylla appears as the si ster to the Hebecarpa-Badiera clade. Unlike a previous morphological analys is, Monnina is strongly supported as monophyletic by trnL-F data, but inter nal relationships are partly unresolved. Species of Polygala sensu Chodat h ave a tendency to group by geographical distribution rather than after trad itional sectional affiliation. Thus, although resolution is poor, it is sus pected that several sections of Polygala are not monophyletic and need to b e recircumscribed.