Cytogenetic studies in Herbertia Sw. (Iridaceae)

Authors
Moreno, Natalia Cecilia; Las Peñas, Maria Laura; Bernardello, Gabriel Luis Mario; Roitman, Germán
Publication Year
2009
Language
English
Format
article
Status
Published version
Description
Conventional Feulgen staining, CMA/DAPI banding and FISH with 18-5.8-26S rDNA probe were used to determine chromosome numbers, karyotypes and physical position of GC or AT rich heterochromatin and rDNA sites in three South American species of Herbertia: H. lahue subsp. amoena, H. quareimana, and H. darwinii. The basic number of the genus is x=7, but the analyzed taxa have different ploidy levels. The chromosome number was 2n=14 for H. darwinii and 2n=28 for H. quareimana. The two populations studied of H. lahue subsp. amoena did result in: 2n=42 (Gualeguaychu) and 56 (Palma de Castillo). Chromosome size varied between 1.60 and 5 µm. The karyotypes did give with a total of 8 metacentric (m) + 6 submetacentric (sm) chromosomes for H. darwinii and 20 m + 8 sm chromosomes for H. quareimana. The two populations of H. lahue subsp. amoena showed with 26 m + 16 sm chromosomes and 36 m + 20 sm chromosomes. H. darwinii had a bimodal karyotype. H. darwinii showed one satellited pair whereas the remaining species two (always in short m chromosome arms). Moreover, the 2n=56 population of H. lahue subsp. amoena one satellite on the long arms. No CMA- /DAPI+ bands were detected in any species, but CMA+/DAPI– bands associated with nucleolar organizing regions (NOR) were found in all cases. The locations of the 18-5.8-26S rDNA sites in all species coincided with CMA+/DAPI- bands. Our data suggest that karyotypic diversification in Herbertia included changes in chromosome number, symmetry, and number and position of NORs regions.
Fil: Moreno, Natalia Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Fil: Las Peñas, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Fil: Bernardello, Gabriel Luis Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
Fil: Roitman, Germán. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Subject
CHROMOSOME
FISH
CMA/DAPI
HERBETIA
Bioquímica y Biología Molecular
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:11336/24650