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Journal of Botany
Volume 2012 (2012), Article ID 632547, 9 pages
http://dx.doi.org/10.1155/2012/632547
Review Article

Review of the Genus Andropogon (Poaceae: Andropogoneae) in America Based on Cytogenetic Studies

1Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET), C.C. 495, 5000 Córdoba, Argentina
2Facultad de Ciencias Agrarias (FCA),UNNE y Instituto de Botánica del Nordeste (IBONE-CONICET), 3400 Corrientes, Argentina

Received 1 October 2011; Accepted 25 November 2011

Academic Editor: Jaume Pellicer

Copyright © 2012 Nicolás Nagahama and Guillermo A. Norrmann. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Andropogon is a pantropical grass genus comprising 100–120 species and found mainly in the grasslands of Africa and the Americas. In the new world the genus is represented by approximately sixty (diploids or hexaploids) species grouped in three sections. The hexaploid condition occurs only in the Americas and the full process of this origin is still uncertain, although cytogenetic analysis coupled with taxonomic evidence have provided strong support for new hypothesis. Stebbins proposed the first hypothesis suggesting that the origin of polyploidy in species of Andropogon in North America resulted from duplication of the genome of some diploid species, and then by intergeneric crosses with species of a related genus. Since then, numerous studies were performed to clarify the evolutionary history of the genus in America. In this paper, we present a review of cytogenetic studies in the American Andropogon species during the last four decades.