Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)

Grindelia is a genus with a complex evolutionary history with reticulate evolution. We studied the karyotype, fluorescent banding, and fluorescence in situ hybridization (FISH) using 18–5.8–26 S and 5 S ribosomal DNA probes to survey karyotypic diversity of South American Grindelia species. Chromoso...

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Detalles Bibliográficos
Publicado: 2016
Materias:
Grindelia
heterochromatin
karyotype
polyploidy
ribosomal genes
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11263504_v_n_p1_Moreno
http://hdl.handle.net/20.500.12110/paper_11263504_v_n_p1_Moreno
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_11263504_v_n_p1_Moreno
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spelling paper:paper_11263504_v_n_p1_Moreno2023-06-08T16:08:07Z Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae) Grindelia heterochromatin karyotype polyploidy ribosomal genes Grindelia is a genus with a complex evolutionary history with reticulate evolution. We studied the karyotype, fluorescent banding, and fluorescence in situ hybridization (FISH) using 18–5.8–26 S and 5 S ribosomal DNA probes to survey karyotypic diversity of South American Grindelia species. Chromosome basic numbers were x = 6 (with several ploidy levels: 2x, 4x, and 6x). All the Grindelia studied conserved the patterns of CG-rich heterochromatin and 18-5.8-26 S rDNA. The third m sat-chromosome pair was homeologous in Grindelia. Chromosome variation, although not always large, accompanied the evolutionary divergence of the taxa studied. The Grindelia studied formed two species groups: (1) G. globularifolia and G. pulchella var. pulchella, (2) G. buphthalmoides, G. cabrerae var. alatocarpa and var. cabrerae, G. chiloensis, G. orientalis, and G. prostrata. These groups do not show any morphological affinities and their phylogenetic relationships are not clearly resolved, suggesting that these groups have recently diverged. © 2016 Società Botanica Italiana 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11263504_v_n_p1_Moreno http://hdl.handle.net/20.500.12110/paper_11263504_v_n_p1_Moreno
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Grindelia
heterochromatin
karyotype
polyploidy
ribosomal genes
spellingShingle Grindelia
heterochromatin
karyotype
polyploidy
ribosomal genes
Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)
topic_facet Grindelia
heterochromatin
karyotype
polyploidy
ribosomal genes
description Grindelia is a genus with a complex evolutionary history with reticulate evolution. We studied the karyotype, fluorescent banding, and fluorescence in situ hybridization (FISH) using 18–5.8–26 S and 5 S ribosomal DNA probes to survey karyotypic diversity of South American Grindelia species. Chromosome basic numbers were x = 6 (with several ploidy levels: 2x, 4x, and 6x). All the Grindelia studied conserved the patterns of CG-rich heterochromatin and 18-5.8-26 S rDNA. The third m sat-chromosome pair was homeologous in Grindelia. Chromosome variation, although not always large, accompanied the evolutionary divergence of the taxa studied. The Grindelia studied formed two species groups: (1) G. globularifolia and G. pulchella var. pulchella, (2) G. buphthalmoides, G. cabrerae var. alatocarpa and var. cabrerae, G. chiloensis, G. orientalis, and G. prostrata. These groups do not show any morphological affinities and their phylogenetic relationships are not clearly resolved, suggesting that these groups have recently diverged. © 2016 Società Botanica Italiana
title Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)
title_short Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)
title_full Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)
title_fullStr Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)
title_full_unstemmed Karyotypes, heterochromatin distribution and rDNA patterns in South American Grindelia (Asteraceae)
title_sort karyotypes, heterochromatin distribution and rdna patterns in south american grindelia (asteraceae)
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11263504_v_n_p1_Moreno
http://hdl.handle.net/20.500.12110/paper_11263504_v_n_p1_Moreno
_version_ 1768543526380896256

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