Intra-specific variation in genome size in maize: Cytological and phenotypic correlates

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Genome size variation accompanies the diversification and evolution of many plant species. Relationshipsbetween DNA amount and phenotypic and cytological characteristics form the basis of most hypotheses thatascribe a biological role to genome size. The goal of the present research was to investigat...

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Autores principales: Poggio, Lidia, González, Graciela Esther
Publicado: 2016
Materias:
DAPI staining
DNA content variation
FISH
Guarani's maize landraces
Heterochromatic knobs
Karyotype parameters
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20412851_v8_n_p_Realini
http://hdl.handle.net/20.500.12110/paper_20412851_v8_n_p_Realini
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_20412851_v8_n_p_Realini2023-06-08T16:33:10Z Intra-specific variation in genome size in maize: Cytological and phenotypic correlates Poggio, Lidia González, Graciela Esther DAPI staining DNA content variation FISH Guarani's maize landraces Heterochromatic knobs Karyotype parameters Genome size variation accompanies the diversification and evolution of many plant species. Relationshipsbetween DNA amount and phenotypic and cytological characteristics form the basis of most hypotheses thatascribe a biological role to genome size. The goal of the present research was to investigate the intra-specific variationin the DNA content in maize populations from Northeastern Argentina and further explore the relationship betweengenome size and the phenotypic traits seed weight and length of the vegetative cycle. Moreover, cytological parameterssuch as the percentage of heterochromatin as well as the number, position and sequence composition ofknobs were analysed and their relationships with 2C DNA values were explored. The populations analysed presentedsignificant differences in 2C DNA amount, from 4.62 to 6.29 pg, representing 36.15 % of the inter-populational variation.Moreover, intra-populational genome size variation was found, varying from 1.08 to 1.63-fold. The variation inthe percentage of knob heterochromatin as well as in the number, chromosome position and sequence composition ofthe knobswas detected among and within the populations. Although a positive relationship between genome size andthe percentage of heterochromatin was observed, a significant correlation was not found. This confirms that othernon-coding repetitive DNA sequences are contributing to the genome size variation. A positive relationship betweenDNA amount and the seed weight has been reported in a large number of species, this relationship was not found inthe populations studied here. The length of the vegetative cycle showed a positive correlation with the percentage ofheterochromatin. This result allowed attributing an adaptive effect to heterochromatin since the length of this cyclewould be optimized via selection for an appropriate percentage of heterochromatin. © The Authors 2015. Fil:Poggio, L. 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. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20412851_v8_n_p_Realini http://hdl.handle.net/20.500.12110/paper_20412851_v8_n_p_Realini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic DAPI staining
DNA content variation
FISH
Guarani's maize landraces
Heterochromatic knobs
Karyotype parameters
spellingShingle DAPI staining
DNA content variation
FISH
Guarani's maize landraces
Heterochromatic knobs
Karyotype parameters
Poggio, Lidia
González, Graciela Esther
Intra-specific variation in genome size in maize: Cytological and phenotypic correlates
topic_facet DAPI staining
DNA content variation
FISH
Guarani's maize landraces
Heterochromatic knobs
Karyotype parameters
description Genome size variation accompanies the diversification and evolution of many plant species. Relationshipsbetween DNA amount and phenotypic and cytological characteristics form the basis of most hypotheses thatascribe a biological role to genome size. The goal of the present research was to investigate the intra-specific variationin the DNA content in maize populations from Northeastern Argentina and further explore the relationship betweengenome size and the phenotypic traits seed weight and length of the vegetative cycle. Moreover, cytological parameterssuch as the percentage of heterochromatin as well as the number, position and sequence composition ofknobs were analysed and their relationships with 2C DNA values were explored. The populations analysed presentedsignificant differences in 2C DNA amount, from 4.62 to 6.29 pg, representing 36.15 % of the inter-populational variation.Moreover, intra-populational genome size variation was found, varying from 1.08 to 1.63-fold. The variation inthe percentage of knob heterochromatin as well as in the number, chromosome position and sequence composition ofthe knobswas detected among and within the populations. Although a positive relationship between genome size andthe percentage of heterochromatin was observed, a significant correlation was not found. This confirms that othernon-coding repetitive DNA sequences are contributing to the genome size variation. A positive relationship betweenDNA amount and the seed weight has been reported in a large number of species, this relationship was not found inthe populations studied here. The length of the vegetative cycle showed a positive correlation with the percentage ofheterochromatin. This result allowed attributing an adaptive effect to heterochromatin since the length of this cyclewould be optimized via selection for an appropriate percentage of heterochromatin. © The Authors 2015.
author Poggio, Lidia
González, Graciela Esther
author_facet Poggio, Lidia
González, Graciela Esther
author_sort Poggio, Lidia
title Intra-specific variation in genome size in maize: Cytological and phenotypic correlates
title_short Intra-specific variation in genome size in maize: Cytological and phenotypic correlates
title_full Intra-specific variation in genome size in maize: Cytological and phenotypic correlates
title_fullStr Intra-specific variation in genome size in maize: Cytological and phenotypic correlates
title_full_unstemmed Intra-specific variation in genome size in maize: Cytological and phenotypic correlates
title_sort intra-specific variation in genome size in maize: cytological and phenotypic correlates
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20412851_v8_n_p_Realini
http://hdl.handle.net/20.500.12110/paper_20412851_v8_n_p_Realini
work_keys_str_mv AT poggiolidia intraspecificvariationingenomesizeinmaizecytologicalandphenotypiccorrelates
AT gonzalezgracielaesther intraspecificvariationingenomesizeinmaizecytologicalandphenotypiccorrelates
_version_ 1768543155801554944

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