Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America

Mostrar todas las versiones(2)

Mimosa subseries Dolentes Barneby and Brevipedes Barneby are ecologically and morphologically high-diversified infrageneric taxa of this genus in southern South America. We performed a cytogenetical and morphological analysis of both subseries. Chromosome numbers from accessions throughout the area...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Morales, M., Fradkin, M., Bessega, C., Poggio, L., Fortunato, R.H.
Formato: JOUR
Materias:
Hybrid zones
octoploid
plant speciation
chromosome
cytogenetics
cytology
geographical distribution
hybrid zone
legume
morphology
new record
polyploidy
speciation (biology)
subtropical region
taxonomy
South America
Fabaceae
Mimosa
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10301887_v31_n2_p190_Morales
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10301887_v31_n2_p190_Morales
record_format dspace
spelling todo:paper_10301887_v31_n2_p190_Morales2023-10-03T15:57:35Z Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America Morales, M. Fradkin, M. Bessega, C. Poggio, L. Fortunato, R.H. Hybrid zones octoploid plant speciation chromosome cytogenetics cytology geographical distribution hybrid zone legume morphology new record polyploidy speciation (biology) subtropical region taxonomy South America Fabaceae Mimosa Mimosa subseries Dolentes Barneby and Brevipedes Barneby are ecologically and morphologically high-diversified infrageneric taxa of this genus in southern South America. We performed a cytogenetical and morphological analysis of both subseries. Chromosome numbers from accessions throughout the area of distribution were studied. The chromosome numbers 2n = 8x = 104 for M. dolens subsp. callosa (Benth.) Barneby, M. dolens subsp. acerba varieties acerba (Benth.) Barneby, latifolia (Benth.) Barneby and rudis (Benth.) Barneby, M. dolens subsp. rigida var. rigescens (Benth.) Barneby, var. anisitsii (Lindm.) Barneby and var. foliolosa (Benth.) Barneby∼ and 2n = 4x = 52 for M. sceptrum Barneby, M. aff. custodis Barneby and M. dolens var. pangloea Barneby are presented for the first time. Their karyotypes were symmetric, with small chromosomes. There were several areas with taxa growing in sympatry, occasionally with intermediate forms. No diploids were found, which suggests the presence of either a declining polyploid complex or ancient polyploidy in the clade of southernmost representatives of M. series Mimosa, the most derived of the genus. Some vegetative, inflorescence and carpological characters seem to be associated with chromosome duplication. The distribution pattern of the cytotypes suggests events of chromosome duplication in centres of diversity and expansion of octoploids to the southernmost areas of distribution. Our findings support the importance of polyploidy in the morphological diversity, distribution and speciation of this complex. © 2018 CSIRO. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10301887_v31_n2_p190_Morales
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Hybrid zones
octoploid
plant speciation
chromosome
cytogenetics
cytology
geographical distribution
hybrid zone
legume
morphology
new record
polyploidy
speciation (biology)
subtropical region
taxonomy
South America
Fabaceae
Mimosa
spellingShingle Hybrid zones
octoploid
plant speciation
chromosome
cytogenetics
cytology
geographical distribution
hybrid zone
legume
morphology
new record
polyploidy
speciation (biology)
subtropical region
taxonomy
South America
Fabaceae
Mimosa
Morales, M.
Fradkin, M.
Bessega, C.
Poggio, L.
Fortunato, R.H.
Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
topic_facet Hybrid zones
octoploid
plant speciation
chromosome
cytogenetics
cytology
geographical distribution
hybrid zone
legume
morphology
new record
polyploidy
speciation (biology)
subtropical region
taxonomy
South America
Fabaceae
Mimosa
description Mimosa subseries Dolentes Barneby and Brevipedes Barneby are ecologically and morphologically high-diversified infrageneric taxa of this genus in southern South America. We performed a cytogenetical and morphological analysis of both subseries. Chromosome numbers from accessions throughout the area of distribution were studied. The chromosome numbers 2n = 8x = 104 for M. dolens subsp. callosa (Benth.) Barneby, M. dolens subsp. acerba varieties acerba (Benth.) Barneby, latifolia (Benth.) Barneby and rudis (Benth.) Barneby, M. dolens subsp. rigida var. rigescens (Benth.) Barneby, var. anisitsii (Lindm.) Barneby and var. foliolosa (Benth.) Barneby∼ and 2n = 4x = 52 for M. sceptrum Barneby, M. aff. custodis Barneby and M. dolens var. pangloea Barneby are presented for the first time. Their karyotypes were symmetric, with small chromosomes. There were several areas with taxa growing in sympatry, occasionally with intermediate forms. No diploids were found, which suggests the presence of either a declining polyploid complex or ancient polyploidy in the clade of southernmost representatives of M. series Mimosa, the most derived of the genus. Some vegetative, inflorescence and carpological characters seem to be associated with chromosome duplication. The distribution pattern of the cytotypes suggests events of chromosome duplication in centres of diversity and expansion of octoploids to the southernmost areas of distribution. Our findings support the importance of polyploidy in the morphological diversity, distribution and speciation of this complex. © 2018 CSIRO.
format JOUR
author Morales, M.
Fradkin, M.
Bessega, C.
Poggio, L.
Fortunato, R.H.
author_facet Morales, M.
Fradkin, M.
Bessega, C.
Poggio, L.
Fortunato, R.H.
author_sort Morales, M.
title Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
title_short Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
title_full Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
title_fullStr Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
title_full_unstemmed Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
title_sort cytogeography and morphological characterisation of a taxonomic, polyploid complex of mimosa (leguminosae) from subtropical south america
url http://hdl.handle.net/20.500.12110/paper_10301887_v31_n2_p190_Morales
work_keys_str_mv AT moralesm cytogeographyandmorphologicalcharacterisationofataxonomicpolyploidcomplexofmimosaleguminosaefromsubtropicalsouthamerica
AT fradkinm cytogeographyandmorphologicalcharacterisationofataxonomicpolyploidcomplexofmimosaleguminosaefromsubtropicalsouthamerica
AT bessegac cytogeographyandmorphologicalcharacterisationofataxonomicpolyploidcomplexofmimosaleguminosaefromsubtropicalsouthamerica
AT poggiol cytogeographyandmorphologicalcharacterisationofataxonomicpolyploidcomplexofmimosaleguminosaefromsubtropicalsouthamerica
AT fortunatorh cytogeographyandmorphologicalcharacterisationofataxonomicpolyploidcomplexofmimosaleguminosaefromsubtropicalsouthamerica
_version_ 1807318271378063360

Ejemplares similares