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Abstract:

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.

Registro:

Documento: Artículo
Título:Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
Autor:Fradkin, M.; Greizerstein, E.; Poggio, L.; Paccapelo, H.; Ferrari, M.R.
Filiación:Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes 2160, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina
Facultad de Agronomía, Universidad Nacional de La Pampa, Cnel. Gil No 353, L6300DUF Santa Rosa, La Pampa, Argentina
Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Chorroarín 280, C1427CWO Ciudad Autónoma de Buenos Aires, Argentina
Facultad de Ciencias Agrarias, Universidad Nacional de Lomas de Zamora, Ruta 4, km 2, 1846 Lavallol, Prov. de Buenos Aires, Argentina
Palabras clave:Heterochromatin; Micronuclei; Shriveled kernels; Tricepiro; Univalents; chromosome; DNA; hybrid; seed; Secale cereale; Triticosecale
Año:2011
Volumen:49
Número:1
Página de inicio:25
Página de fin:31
Título revista:Darwiniana
Título revista abreviado:Darwiniana
ISSN:00116793
CODEN:DARWA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00116793_v49_n1_p25_Fradkin.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v49_n1_p25_Fradkin

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Citas:

---------- APA ----------
Fradkin, M., Greizerstein, E., Poggio, L., Paccapelo, H. & Ferrari, M.R. (2011) . Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines . Darwiniana, 49(1), 25-31.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v49_n1_p25_Fradkin [ ]
---------- CHICAGO ----------
Fradkin, M., Greizerstein, E., Poggio, L., Paccapelo, H., Ferrari, M.R. "Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines " . Darwiniana 49, no. 1 (2011) : 25-31.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v49_n1_p25_Fradkin [ ]
---------- MLA ----------
Fradkin, M., Greizerstein, E., Poggio, L., Paccapelo, H., Ferrari, M.R. "Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines " . Darwiniana, vol. 49, no. 1, 2011, pp. 25-31.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v49_n1_p25_Fradkin [ ]
---------- VANCOUVER ----------
Fradkin, M., Greizerstein, E., Poggio, L., Paccapelo, H., Ferrari, M.R. Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines . Darwiniana. 2011;49(1):25-31.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00116793_v49_n1_p25_Fradkin [ ]