RT Journal Article
T1 Genome size and numerical polymorphism for the B chromosome in races of maize (Zea mays ssp. mays, Poaceae)
A1 Rosato, Carmen Luisa Marcela
A1 Chiavarino, Amilcar
A1 Naranjo, Carlos
A1 Camara Hernandez, Julian
A1 Poggio, Lidia
AB 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.
PB Botanical Society of America
SN 0002-9122
YR 1998
FD 1998
LK https://hdl.handle.net/20.500.14352/95311
UL https://hdl.handle.net/20.500.14352/95311
LA eng
NO Rosato, Marcela, et al. «Genome Size and Numerical Polymorphism for the B Chromosome in Races of Maize ( Zea Mays Ssp. Mays, Poaceae)». American Journal of Botany, vol. 85, n.o 2, febrero de 1998, pp. 168-74. https://doi.org/10.2307/2446305.
NO This research was supported by grants of the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad de Buenos Aires, and Universidad Nacional de La Plata, Argentina. M.R. and A.M.C. were supported by scholarships from CONICET.
NO Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)
NO Universidad de Buenos Aires
NO Universidad Nacional de La Plata (Argentina)
DS Docta Complutense
RD 11 jul 2025