Chromosome studies in <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size

This paper presents the karyotype and DNA content of 12 diploid species of <i>Hippeastrum</i> from South America. The variation in genome size is compared with the karyotype and DNA content of <i>Amaryllis belladonna</i> from South Africa. The <i>Hippeastrum</i> s...

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Autores principales: Poggio, Lidia, González, Graciela Esther, Naranjo, Carlos Alberto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Naturales
Bimodal karyotype
Nuclear DNA content
Orthoselection
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82960
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82960
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Bimodal karyotype
Nuclear DNA content
Orthoselection
spellingShingle Ciencias Naturales
Bimodal karyotype
Nuclear DNA content
Orthoselection
Poggio, Lidia
González, Graciela Esther
Naranjo, Carlos Alberto
Chromosome studies in <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size
topic_facet Ciencias Naturales
Bimodal karyotype
Nuclear DNA content
Orthoselection
description This paper presents the karyotype and DNA content of 12 diploid species of <i>Hippeastrum</i> from South America. The variation in genome size is compared with the karyotype and DNA content of <i>Amaryllis belladonna</i> from South Africa. The <i>Hippeastrum</i> 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. <i>A. belladonna</i> has a larger DNA content and possesses a karyotype different from that of <i>Hippeastrum</i> spp., supporting the distinction between the two genera and upholding the name <i>Amaryllis</i> for the South African entity against <i>Hippeastrum</i> for the South American genus.
format Articulo
Articulo
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 <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size
title_short Chromosome studies in <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size
title_full Chromosome studies in <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size
title_fullStr Chromosome studies in <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size
title_full_unstemmed Chromosome studies in <i>Hippeastrum</i> (Amaryllidaceae): variation in genome size
title_sort chromosome studies in <i>hippeastrum</i> (amaryllidaceae): variation in genome size
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/82960
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AT gonzalezgracielaesther chromosomestudiesinihippeastrumiamaryllidaceaevariationingenomesize
AT naranjocarlosalberto chromosomestudiesinihippeastrumiamaryllidaceaevariationingenomesize
bdutipo_str Repositorios
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