Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation

Evolutionary chromosome change involves significant variation in DNA amount in diploids and genome downsizing in polyploids. Genome size and karyotype parameters of Hippeastrum species with different ploidy level were analysed. In Hippeastrum, polyploid species show less DNA content per basic genome...

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Autores principales:	Poggio, L., Realini, M.F., Fourastié, M.F., García, A.M., González, G.E.
Formato:	JOUR
Materias:	Bimodal karyotype DNA amount variation Genome size Hippeastrum Karyotype constancy Polyploids
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_20412851_v6_n_p_Poggio
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_20412851_v6_n_p_Poggio
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spelling	todo:paper_20412851_v6_n_p_Poggio2023-10-03T16:37:54Z Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation Poggio, L. Realini, M.F. Fourastié, M.F. García, A.M. González, G.E. Bimodal karyotype DNA amount variation Genome size Hippeastrum Karyotype constancy Polyploids Evolutionary chromosome change involves significant variation in DNA amount in diploids and genome downsizing in polyploids. Genome size and karyotype parameters of Hippeastrum species with different ploidy level were analysed. In Hippeastrum, polyploid species show less DNA content per basic genome than diploid species. The rate of variation is lower at higher ploidy levels. All the species have a basic number x = 11 and bimodal karyotypes. The basic karyotypes consist of four short metacentric chromosomes and seven large chromosomes (submetacentric and subtelocentric). The bimodal karyotype is preserved maintaining the relative proportions of members of the haploid chromosome set, even in the presence of genome downsizing. The constancy of the karyotype is maintained because changes in DNA amount are proportional to the length of the whole-chromosome complement and vary independently in the long and short sets of chromosomes. This karyotype constancy in taxa of Hippeastrumwith different genome size and ploidy level indicates that the distribution of extra DNA within the complement is not at random and suggests the presence of mechanisms selecting for constancy, or against changes, in karyotype morphology. Fil:Poggio, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fourastié, M.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:García, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:González, G.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20412851_v6_n_p_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 DNA amount variation Genome size Hippeastrum Karyotype constancy Polyploids
spellingShingle	Bimodal karyotype DNA amount variation Genome size Hippeastrum Karyotype constancy Polyploids Poggio, L. Realini, M.F. Fourastié, M.F. García, A.M. González, G.E. Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation
topic_facet	Bimodal karyotype DNA amount variation Genome size Hippeastrum Karyotype constancy Polyploids
description	Evolutionary chromosome change involves significant variation in DNA amount in diploids and genome downsizing in polyploids. Genome size and karyotype parameters of Hippeastrum species with different ploidy level were analysed. In Hippeastrum, polyploid species show less DNA content per basic genome than diploid species. The rate of variation is lower at higher ploidy levels. All the species have a basic number x = 11 and bimodal karyotypes. The basic karyotypes consist of four short metacentric chromosomes and seven large chromosomes (submetacentric and subtelocentric). The bimodal karyotype is preserved maintaining the relative proportions of members of the haploid chromosome set, even in the presence of genome downsizing. The constancy of the karyotype is maintained because changes in DNA amount are proportional to the length of the whole-chromosome complement and vary independently in the long and short sets of chromosomes. This karyotype constancy in taxa of Hippeastrumwith different genome size and ploidy level indicates that the distribution of extra DNA within the complement is not at random and suggests the presence of mechanisms selecting for constancy, or against changes, in karyotype morphology.
format	JOUR
author	Poggio, L. Realini, M.F. Fourastié, M.F. García, A.M. González, G.E.
author_facet	Poggio, L. Realini, M.F. Fourastié, M.F. García, A.M. González, G.E.
author_sort	Poggio, L.
title	Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation
title_short	Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation
title_full	Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation
title_fullStr	Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation
title_full_unstemmed	Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation
title_sort	genome downsizing and karyotype constancy in diploid and polyploid congeners: a model of genome size variation
url	http://hdl.handle.net/20.500.12110/paper_20412851_v6_n_p_Poggio
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Genome downsizing and karyotype constancy in diploid and polyploid congeners: A model of genome size variation

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