INVESTIGADORES
POGGIO Lidia
artículos
Título:
TELOMERIC HETEROCHROMATIN, SEEDS AND MEIOTIC CHARACTERISTICS IN TWO TRICEPIRO LINES
Autor/es:
MAIA FRADKIN, E. GREIZERSTEIN, L. POGGIO, H. PACCAPELO, M. ROSA FERRARI
Revista:
DARWINIANA
Editorial:
INSTITUTO DE BOTÁNICA DARWINION
Referencias:
Lugar: Buenos Aires; Año: 2011 vol. 49 p. 25 - 31
ISSN:
0011-6793
Resumen:
A hybrid, named tricepiro, was obtained in 1972, by crossing a hexaploid triticale (2n=6x=42) and
an octoploid trigopiro (2n=8x=56). The lines achieved include the tricepiro Don René INTA, which
has shriveled kernels, and FA-L2, which has smooth ones. The relationship between the heterochromatin content of the rye chromosomes, the seed weight, the presence of meiotic abnormalities and the
kernel shriveling has been documented previously in other intergeneric hybrids. The purpose of this
study was to determine the average percentage of heterochromatin content in the rye chromosomes of
the two tricepiro lines mentioned above and to relate this feature to some characteristics of the meiosis and seeds. We confirmed that the two lines have the same total chromosome number (2n=42) and
the same number of rye chromosomes (14). We found that both lines have a complete chromosome
mating until late diakinesis, but differ in the percentage of cells with univalents outside the equatorial
plate in Metaphase I (Don René 42.85% and FA-L2 14.00%). In addition, the two lines differed in their
meiotic index (Don René 66.47% and FA-L2 87.90%) and seed weight (Don René 0.029 ± 0.000 g and
FA-L2 0.038 ± 0.001 g). The C-banding in rye chromosomes in mitotic metaphase indicated that the
average percentage of heterochromatin content did not differ significantly between the two lines. In
contrast to our expectations, the meiotic behavior and seed characteristics were not related to the heterochromatin percentage of the rye chromosomes of the tricepiro lines studied.