Chromosome and morphological studies in the mimosa debilis complex (Mimosoideae, Leguminosae) from southern South America

Authors
Morales, Matias; Wulff, Arturo Federico; Fortunato, Renée Hersilia; Poggio, Lidia
Publication Year
2010
Language
English
Format
article
Status
Published version
Description
Mimosa debilis Humb. Bonpl. ex Willd. and M. nuda Benth. were grouped in specific and infraspecific complexes. Both taxa showed exomorphological similarities, with conflicts in their taxonomic circumscription and present different ploidy levels. The objective of the present contribution was to analyse chromosome numbers of different populations and to evaluate morphological characters of specimens from Paraguay, Argentina and boundary regions. Chromosome numbers of M. debilis var. debilis (2n=2x=26 and 2n=4x=52) confirmed previous reports, whereas those of M. nuda var. glaberrima (2x=26, 4x=52), M. nuda var. gracilipes (2x=26, 4x=52) and M. nuda var. nuda (4x=52) are presented for the first time. Variation was observed in habit, foliar and floral morphology and was correlated with the chromosome number and the geographical distribution of the taxa. Groups with stable morphological characters and restricted geographic distribution were identified. Also, the results showed a pattern of hybrid swarms and polyploids of different origin that may explain the existence of taxonomic conflicts in the M. debilisM. nuda species complex. On the basis of these results, M. nuda should be included in the synonymy of M. debilis.
Fil: Morales, Matias. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Wulff, Arturo Federico. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Fortunato, Renée Hersilia. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Poggio, Lidia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Subject
KARYOLOGICAL
MIMOSA
COMPLEX
Otras Ciencias Biológicas
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/68689