Data/hora: 22/06/2024 01:53:49

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 21/05/1998
Data da última atualização: | 18/04/2023
Autoria: | FLUMINHAN JUNIOR, A.; AGUIAR- PERECIN, M.L.R.de; SANTOS, J. A. dos.
Afiliação: | Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo.
Título: | Evidence for heterochromatin involvement in chromosome breakage in maize callus culture.
Ano de publicação: | 1996
Fonte/Imprenta: | Annals of Botany, v.78, p.73-81, 1996.
Idioma: | Inglês
Conteúdo: | Mitotic instability was investigated in maize embryogenic callus cultures induced from tropical genetic stocks. Bridges resulting from delayed separation of chromatids and typical bridges were obsered in Feulgen preparations. The analysis of C-banded anaphases showed that delayed chromatids were held together at heterochromatic knob sites (primary event), and the presence of typical bridges without bands corresponding to knobs. these events suggest the occurrence of breakage-fusion-bridge (BFB) Cicles initiated by chromosome arms broken during the primary event. Additional evidence for such a mechanism was the presence of gross aberrations involving chromosome 7, detected in several C-banded metaphases of some cultures. It is hypothesized that such.
Palavras-Chave: | heterochromatin C-banding; maize; Zea mays L.
Thesaurus Nal: | chromosome breakage; tissue culture.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (17070-1) - ADC - AP - DD - Publicação digital -  -  - DIS