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Abstract:

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.

Registro:

Documento: Artículo
Título:Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
Autor:Rosato, M.; Chiavarino, A.M.; Naranjo, C.A.; Hernandez, J.C.; Poggio, L.
Filiación:Instituto Fitotécnico de Santa Catalina (FCAF, UNLP), Centro de Investigaciones Genéticas (UNLP-CONICET-CIC), C.C. 4, 1836 Llavallol, Buenos Aires, Argentina
Departamento de Biología, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Cátedra de Botánica, Facultad de Agronomía, UBA, Buenos Aires, Argentina
Palabras clave:B chromosome; DNA content; Genome size; Maize; Maize native races; Poaceae; Zea mays ssp. mays; Zea mays
Año:1998
Volumen:85
Número:2
Página de inicio:168
Página de fin:174
DOI: http://dx.doi.org/10.2307/2446305
Título revista:American Journal of Botany
Título revista abreviado:Am. J. Bot.
ISSN:00029122
CODEN:AJBOA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00029122_v85_n2_p168_Rosato.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v85_n2_p168_Rosato

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Citas:

---------- APA ----------
Rosato, M., Chiavarino, A.M., Naranjo, C.A., Hernandez, J.C. & Poggio, L. (1998) . Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae). American Journal of Botany, 85(2), 168-174.
http://dx.doi.org/10.2307/2446305
---------- CHICAGO ----------
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)" . American Journal of Botany 85, no. 2 (1998) : 168-174.
http://dx.doi.org/10.2307/2446305
---------- MLA ----------
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)" . American Journal of Botany, vol. 85, no. 2, 1998, pp. 168-174.
http://dx.doi.org/10.2307/2446305
---------- VANCOUVER ----------
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). Am. J. Bot. 1998;85(2):168-174.
http://dx.doi.org/10.2307/2446305