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- Title
Phylogeny of Chamaecrista Moench (Leguminosae-Caesalpinioideae) based on nuclear and chloroplast DNA regions.
- Authors
de Souza Conceiçäo, Adilva; de Queiroz, Luciano Paganucci; Lewis, Gwilym Peter; de Andrade, Maria José Gomes; de Almeida, Paulo Ricardo Machado; Schnadelbach, Alessandra Selbach; van den Berg, Cássio
- Abstract
Chamaecrista Moench is a genus of caesalpinioid legumes with about 330 species mostly from the New World. The phylogeny of the genus was studied using sequence data from nuclear ITS and plastid trnL-F DNA spacers, representing all six sections of Chamaecrista. Separate and combined analyses recovered the same major clades with high bootstrap and posterior probabilities support, except for the subclades of representatives of sections Caliciopsis, Chamaecrista, and Xerocalyx. The monophyly of Chamaecrista was highly supported in all analyses. Sections Apoucouita and Xerocalyx were supported as monophyletic, sect. Absus was paraphyletic and subsect. Baseophyllum was resolved more closely related to species of sections Chamaecrisia, Caliciopsis, and Xerocalyx than to subsect. Absus. The monotypic section Grimaldia was embedded within subsect. Absus. Section Chamaecrista was paraphyletic with respect to sections Caliciopsis and Xerocalyx. Our analyses suggest that the diversification patterns in Chamaecrista occurred through an initial shift from rainforest trees to a more diverse dade of savannah shrubs. Within the latter group, two main subclades were recovered: (I) a planaltine and high-mountain dade characterized by absence of extrafloral nectaries and the appearance of sticky glandular hairs; and (2) a mostly herbaceous dade with axillary fascicled inflorescences and reduced chromosome numbers. This last group is more diverse in open grassland areas and includes many colonizers of waste ground.
- Subjects
AMERICA; PHYLOGENY; CHAMAECRISTA; CHLOROPLAST formation; DNA; PLANT genetics; NUCLEOTIDE sequence; PLANT ecology; PHYSIOLOGY
- Publication
Taxon, 2009, Vol 58, Issue 4, p1168
- ISSN
0040-0262
- Publication type
Article
- DOI
10.1002/tax.584010