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Abstract:

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.

Registro:

Documento: Artículo
Título:Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America
Autor:Morales, M.; Fradkin, M.; Bessega, C.; Poggio, L.; Fortunato, R.H.
Filiación:Instituto de Recursos Biológicos (CIRN CNIA), Instituto Nacional de Investigaciones Agropecuarias (INTA), Nicolás Repetto and Los Reseros s.n. (1686), Hurlingham, Buenos Aires, Argentina
Facultad de Agronomía y Ciencias Agroalimentarias, Universidad de Morón, Cabildo 134, (1408), Morón, Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2900, (C1425FQB), Ciudad Autónoma de Buenos Aires, Argentina
Cátedra de Mejoramiento Genético, Facultad de Ciencias Agrarias, Universidad Nacional de Lomas de Zamora (UNLZ), Camino de Cintura and Juan XXIII, (1836), Lavallol, Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), Intendente Güiraldes 2160 (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave: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
Año:2018
Volumen:31
Número:2
Página de inicio:190
Página de fin:208
DOI: http://dx.doi.org/10.1071/SB16033
Título revista:Australian Systematic Botany
Título revista abreviado:Aust. Syst. Bot.
ISSN:10301887
CODEN:ASBOE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10301887_v31_n2_p190_Morales

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Citas:

---------- APA ----------
Morales, M., Fradkin, M., Bessega, C., Poggio, L. & Fortunato, R.H. (2018) . Cytogeography and morphological characterisation of a taxonomic, polyploid complex of Mimosa (Leguminosae) from subtropical South America. Australian Systematic Botany, 31(2), 190-208.
http://dx.doi.org/10.1071/SB16033
---------- CHICAGO ----------
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" . Australian Systematic Botany 31, no. 2 (2018) : 190-208.
http://dx.doi.org/10.1071/SB16033
---------- MLA ----------
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" . Australian Systematic Botany, vol. 31, no. 2, 2018, pp. 190-208.
http://dx.doi.org/10.1071/SB16033
---------- VANCOUVER ----------
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. Aust. Syst. Bot. 2018;31(2):190-208.
http://dx.doi.org/10.1071/SB16033