Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size

This paper presents the karyotype and DNA content of 12 diploid species of Hippeastrum from South America. The variation in genome size is compared with the karyotype and DNA content of Amaryllis belladonna from South Africa. The Hippeastrum species present a uniform and bimodal basic karyotype form...

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Autores principales: Poggio, Lidia, González, Graciela Esther, Naranjo, Carlos Alberto
Publicado: 2007
Materias:
Bimodal karyotype
Nuclear DNA content
Orthoselection
angiosperm
chromosome
DNA
genome
karyotype
Amaryllidaceae
Amaryllis (angiosperm)
Amaryllis belladonna
Atropa belladonna
Hippeastrum
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v155_n2_p171_Poggio
http://hdl.handle.net/20.500.12110/paper_00244074_v155_n2_p171_Poggio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00244074_v155_n2_p171_Poggio
record_format dspace
spelling paper:paper_00244074_v155_n2_p171_Poggio2023-06-08T14:52:21Z Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size Poggio, Lidia González, Graciela Esther Naranjo, Carlos Alberto Bimodal karyotype Nuclear DNA content Orthoselection angiosperm chromosome DNA genome karyotype Amaryllidaceae Amaryllis (angiosperm) Amaryllis belladonna Atropa belladonna Hippeastrum This paper presents the karyotype and DNA content of 12 diploid species of Hippeastrum from South America. The variation in genome size is compared with the karyotype and DNA content of Amaryllis belladonna from South Africa. The Hippeastrum species present a uniform and bimodal basic karyotype formula, but significant differences are found in the total chromosome volume (TCV) and nuclear DNA content. A positive correlation between the DNA content and TCV is also observed. The karyotype's constancy is a product of changes in DNA content occurring in the whole chromosome complement. The DNA addition to the long and short sets of chromosomes varies independently. In species with higher DNA contents, the short chromosomes add equal DNA amounts to both arms, maintaining their metacentric morphology, whereas the long chromosomes add DNA only to the short arm, increasing the chromosome symmetry. These data show that the evolutionary changes in DNA amount are proportional to chromosome length, maintaining the karyotypic uniformity. A. belladonna has a larger DNA content and possesses a karyotype different from that of Hippeastrum spp., supporting the distinction between the two genera and upholding the name Amaryllis for the South African entity against Hippeastrum for the South American genus. © 2007 The Linnean Society of London. Fil:Poggio, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:González, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Naranjo, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v155_n2_p171_Poggio http://hdl.handle.net/20.500.12110/paper_00244074_v155_n2_p171_Poggio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Bimodal karyotype
Nuclear DNA content
Orthoselection
angiosperm
chromosome
DNA
genome
karyotype
Amaryllidaceae
Amaryllis (angiosperm)
Amaryllis belladonna
Atropa belladonna
Hippeastrum
spellingShingle Bimodal karyotype
Nuclear DNA content
Orthoselection
angiosperm
chromosome
DNA
genome
karyotype
Amaryllidaceae
Amaryllis (angiosperm)
Amaryllis belladonna
Atropa belladonna
Hippeastrum
Poggio, Lidia
González, Graciela Esther
Naranjo, Carlos Alberto
Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size
topic_facet Bimodal karyotype
Nuclear DNA content
Orthoselection
angiosperm
chromosome
DNA
genome
karyotype
Amaryllidaceae
Amaryllis (angiosperm)
Amaryllis belladonna
Atropa belladonna
Hippeastrum
description This paper presents the karyotype and DNA content of 12 diploid species of Hippeastrum from South America. The variation in genome size is compared with the karyotype and DNA content of Amaryllis belladonna from South Africa. The Hippeastrum species present a uniform and bimodal basic karyotype formula, but significant differences are found in the total chromosome volume (TCV) and nuclear DNA content. A positive correlation between the DNA content and TCV is also observed. The karyotype's constancy is a product of changes in DNA content occurring in the whole chromosome complement. The DNA addition to the long and short sets of chromosomes varies independently. In species with higher DNA contents, the short chromosomes add equal DNA amounts to both arms, maintaining their metacentric morphology, whereas the long chromosomes add DNA only to the short arm, increasing the chromosome symmetry. These data show that the evolutionary changes in DNA amount are proportional to chromosome length, maintaining the karyotypic uniformity. A. belladonna has a larger DNA content and possesses a karyotype different from that of Hippeastrum spp., supporting the distinction between the two genera and upholding the name Amaryllis for the South African entity against Hippeastrum for the South American genus. © 2007 The Linnean Society of London.
author Poggio, Lidia
González, Graciela Esther
Naranjo, Carlos Alberto
author_facet Poggio, Lidia
González, Graciela Esther
Naranjo, Carlos Alberto
author_sort Poggio, Lidia
title Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size
title_short Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size
title_full Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size
title_fullStr Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size
title_full_unstemmed Chromosome studies in Hippeastrum (Amaryllidaceae): Variation in genome size
title_sort chromosome studies in hippeastrum (amaryllidaceae): variation in genome size
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v155_n2_p171_Poggio
http://hdl.handle.net/20.500.12110/paper_00244074_v155_n2_p171_Poggio
work_keys_str_mv AT poggiolidia chromosomestudiesinhippeastrumamaryllidaceaevariationingenomesize
AT gonzalezgracielaesther chromosomestudiesinhippeastrumamaryllidaceaevariationingenomesize
AT naranjocarlosalberto chromosomestudiesinhippeastrumamaryllidaceaevariationingenomesize
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