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Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines

Fradkin, M. - Greizerstein, E. - Poggio, L. - Paccapelo, H. - Ferrari, M.R.
   
Fecha:
2011
Tipo de documento: 
info:eu-repo/semantics/article
info:ar-repo/semantics/artículo
info:eu-repo/semantics/publishedVersion
Formato:
application/pdf
Temas:
Heterochromatin - Micronuclei - Shriveled kernels - Tricepiro - Univalents - chromosome - DNA - hybrid - seed - Secale cereale - Triticosecale
Descripción:
A hybrid, named tricepiro, was obtained in 1972, by crossing a hexaploid triticale (2n=6×=42) and an octoploid trigopiro (2n=8×=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.
Fil:Fradkin, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Greizerstein, E. 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.
Fil:Ferrari, M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente:
Darwiniana 2011;49(1):25-31
Identificador:
http://hdl.handle.net/20.500.12110/paper_00116793_v49_n1_p25_Fradkin
http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00116793_v49_n1_p25_Fradkin_oai
Derechos:
info:eu-repo/semantics/openAccess

Cita bibliográfica:

Fradkin, M. ; Greizerstein, E. ; Poggio, L. ; et al. (2011).  Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines .  (info:eu-repo/semantics/article).  [consultado:  ] Disponible en el Repositorio Digital Institucional de la Universidad de Buenos Aires:  <http://hdl.handle.net/20.500.12110/paper_00116793_v49_n1_p25_Fradkin>