Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)

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Twenty-one native populations (1120 individuals) of maize from Northern Argentina were studied. These populations, which belong to 13 native races were cultivated at different altitudes (80-3620 m). Nineteen of the populations analyzed showed B chromosome (Bs) numerical, polymorphism. The frequency...

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Autores principales: Rosato, M., Chiavarino, A.M., Naranjo, C.A., Hernandez, J.C., Poggio, L.
Formato: JOUR
Materias:
B chromosome
DNA content
Genome size
Maize
Maize native races
Poaceae
Zea mays ssp. mays
Zea mays
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p168_Rosato
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00029122_v85_n2_p168_Rosato
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spelling todo:paper_00029122_v85_n2_p168_Rosato2023-10-03T13:54:38Z Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae) Rosato, M. Chiavarino, A.M. Naranjo, C.A. Hernandez, J.C. Poggio, L. B chromosome DNA content Genome size Maize Maize native races Poaceae Zea mays ssp. mays Zea mays Twenty-one native populations (1120 individuals) of maize from Northern Argentina were studied. These populations, which belong to 13 native races were cultivated at different altitudes (80-3620 m). Nineteen of the populations analyzed showed B chromosome (Bs) numerical, polymorphism. The frequency of individuals with Bs varied from 0 to 94%. The number of Bs per plant varied from 0 to 8 Bs, with the predominant doses being 0, 1, 2, and 3. Those populations with varying number of Bs showed a positive and statistically significant correlation of mean number of Bs with altitude. The DNA content, in plants without Bs (A-DNA)(2n = 20), of 17 populations of the 21 studied was determined. A 36% variation (5.0-6.8 pg) in A-DNA content was found. A significant negative correlation between A-DNA content and altitude of cultivation and between A-DNA content and mean number of Bs was found. This indicates that there is a close interrelationship between the DNA content of A chromosomes and doses of Bs. These results suggest that there is a maximum limit to the mass of nuclear DNA so that Bs are tolerated as long as this maximum limit is not exceeded. Fil:Rosato, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Chiavarino, A.M. 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. Fil:Poggio, L. 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_00029122_v85_n2_p168_Rosato
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic B chromosome
DNA content
Genome size
Maize
Maize native races
Poaceae
Zea mays ssp. mays
Zea mays
spellingShingle B chromosome
DNA content
Genome size
Maize
Maize native races
Poaceae
Zea mays ssp. mays
Zea mays
Rosato, M.
Chiavarino, A.M.
Naranjo, C.A.
Hernandez, J.C.
Poggio, L.
Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
topic_facet B chromosome
DNA content
Genome size
Maize
Maize native races
Poaceae
Zea mays ssp. mays
Zea mays
description Twenty-one native populations (1120 individuals) of maize from Northern Argentina were studied. These populations, which belong to 13 native races were cultivated at different altitudes (80-3620 m). Nineteen of the populations analyzed showed B chromosome (Bs) numerical, polymorphism. The frequency of individuals with Bs varied from 0 to 94%. The number of Bs per plant varied from 0 to 8 Bs, with the predominant doses being 0, 1, 2, and 3. Those populations with varying number of Bs showed a positive and statistically significant correlation of mean number of Bs with altitude. The DNA content, in plants without Bs (A-DNA)(2n = 20), of 17 populations of the 21 studied was determined. A 36% variation (5.0-6.8 pg) in A-DNA content was found. A significant negative correlation between A-DNA content and altitude of cultivation and between A-DNA content and mean number of Bs was found. This indicates that there is a close interrelationship between the DNA content of A chromosomes and doses of Bs. These results suggest that there is a maximum limit to the mass of nuclear DNA so that Bs are tolerated as long as this maximum limit is not exceeded.
format JOUR
author Rosato, M.
Chiavarino, A.M.
Naranjo, C.A.
Hernandez, J.C.
Poggio, L.
author_facet Rosato, M.
Chiavarino, A.M.
Naranjo, C.A.
Hernandez, J.C.
Poggio, L.
author_sort Rosato, M.
title Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
title_short Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
title_full Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
title_fullStr Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
title_full_unstemmed Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
title_sort genome size and numerical polymorphism for the b chromosome in races of maize (zea mays ssp. mays, poaceae)
url http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p168_Rosato
work_keys_str_mv AT rosatom genomesizeandnumericalpolymorphismforthebchromosomeinracesofmaizezeamayssspmayspoaceae
AT chiavarinoam genomesizeandnumericalpolymorphismforthebchromosomeinracesofmaizezeamayssspmayspoaceae
AT naranjoca genomesizeandnumericalpolymorphismforthebchromosomeinracesofmaizezeamayssspmayspoaceae
AT hernandezjc genomesizeandnumericalpolymorphismforthebchromosomeinracesofmaizezeamayssspmayspoaceae
AT poggiol genomesizeandnumericalpolymorphismforthebchromosomeinracesofmaizezeamayssspmayspoaceae
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