Phylogeny of Prosopis (Leguminosae) as shown by morphological and biochemical evidence
Alicia D. Burghardt A C and Shirley M. Espert BA Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CONICET, República Argentina.
B Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, República Argentina.
C Corresponding author. Email: alibu@bg.fcen.uba.ar
Australian Systematic Botany 20(4) 332-339 https://doi.org/10.1071/SB06043
Submitted: 17 November 2006 Accepted: 22 March 2007 Published: 5 September 2007
Abstract
Prosopis L. is a rather primitive genus within the Leguminosae–Mimosoideae. This genus has been divided into five sections on the basis especially of the vegetative diversification of the spines. Three of the sections, Algarobia, Monilicarpa and Strombocarpa, are distributed in America. In order to elucidate systematic relationships between the American sections of Prosopis, a morphological and biochemical phylogeny were obtained. Twenty-two morphological characters were scored for 27 species of Prosopis and the outgroup taxon following polyacrilamide gel electrophoresis of seed storage proteins. The results obtained clearly prove that the secction Strombocarpa is a natural taxon. The section Algarobia, on the other hand, seems to comprise an artificial grouping of species. Members of the series Denudantes appear isolated from the remaining species, therefore this taxon should be treated as a new section within Prosopis. The section Algarobia should be circumscribed to series Chilenses, Ruscifoliae and Pallidae, which are always united in a monophyletic clade. Finally, no evidence was found to confirm the existence of the section Monilicarpa.
Acknowledgements
We thank Ramon Palacios for providing the plant material used in our study and for his valuable suggestions; and Janice Saunders for the critical reading of the manuscript. We are deeply grateful to the reviewers, who made important remarks that greatly improved this manuscript. This work was supported by grants from the CONICET and Universidad of Buenos Aires.
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