Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines

Mostrar todas las versiones(3)

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 con...

Descripción completa

Detalles Bibliográficos
Autores principales: Fradkin, M., Greizerstein, E., Poggio, L., Paccapelo, H., Ferrari, M.R.
Formato: JOUR
Materias:
Heterochromatin
Micronuclei
Shriveled kernels
Tricepiro
Univalents
chromosome
DNA
hybrid
seed
Secale cereale
Triticosecale
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00116793_v49_n1_p25_Fradkin
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00116793_v49_n1_p25_Fradkin
record_format dspace
spelling todo:paper_00116793_v49_n1_p25_Fradkin2023-10-03T14:10:11Z Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines Fradkin, M. Greizerstein, E. Poggio, L. Paccapelo, H. Ferrari, M.R. Heterochromatin Micronuclei Shriveled kernels Tricepiro Univalents chromosome DNA hybrid seed Secale cereale Triticosecale 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00116793_v49_n1_p25_Fradkin
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Heterochromatin
Micronuclei
Shriveled kernels
Tricepiro
Univalents
chromosome
DNA
hybrid
seed
Secale cereale
Triticosecale
spellingShingle Heterochromatin
Micronuclei
Shriveled kernels
Tricepiro
Univalents
chromosome
DNA
hybrid
seed
Secale cereale
Triticosecale
Fradkin, M.
Greizerstein, E.
Poggio, L.
Paccapelo, H.
Ferrari, M.R.
Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
topic_facet Heterochromatin
Micronuclei
Shriveled kernels
Tricepiro
Univalents
chromosome
DNA
hybrid
seed
Secale cereale
Triticosecale
description 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.
format JOUR
author Fradkin, M.
Greizerstein, E.
Poggio, L.
Paccapelo, H.
Ferrari, M.R.
author_facet Fradkin, M.
Greizerstein, E.
Poggio, L.
Paccapelo, H.
Ferrari, M.R.
author_sort Fradkin, M.
title Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
title_short Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
title_full Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
title_fullStr Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
title_full_unstemmed Telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
title_sort telomeric heterochromatin, seeds and meiotic characteristics in two tricepiro lines
url http://hdl.handle.net/20.500.12110/paper_00116793_v49_n1_p25_Fradkin
work_keys_str_mv AT fradkinm telomericheterochromatinseedsandmeioticcharacteristicsintwotricepirolines
AT greizersteine telomericheterochromatinseedsandmeioticcharacteristicsintwotricepirolines
AT poggiol telomericheterochromatinseedsandmeioticcharacteristicsintwotricepirolines
AT paccapeloh telomericheterochromatinseedsandmeioticcharacteristicsintwotricepirolines
AT ferrarimr telomericheterochromatinseedsandmeioticcharacteristicsintwotricepirolines
_version_ 1807315508109770752

Ejemplares similares