Data/hora: 21/06/2024 15:26:00

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 10/07/2009
Data da última atualização: | 20/07/2009
Autoria: | UTSUNOMYA, K. S.; PAGLIARINI, M. S.; VALLE, C. B. do.
Afiliação: | Karina Sayuri Utsunomya, UEM; Maria Suely Pagliarini, UEM; Cacilda Borges do Valle, CNPGC.
Título: | Chromosome transfer among meiocytes in Brachiaria nigropedata (Ficalho & Hiern) Stapf (Gramineae).
Ano de publicação: | 2004
Fonte/Imprenta: | Cytologia, Tokyo, v. 69, n. 4, p. 395-398, 2004.
Idioma: | Inglês
Conteúdo: | Cytological studies of microsporogenesis in tetraploid (2n=4x=36) and apomictic accessions of Brachiaria nigropedata revealed chromosome transfer between microsporocytes in early meiosis. Six, in 20 accessions available at Embrapa Beef Cattle Research Center, presented cytomixis in frequencies ranging from 0.6 to 9.7%. The number of cells involved in the phenomenon varied from 2 to 4, with predominance of the first. Transference of a few chromosomes to the whole genome was found among cells. Prior to cytomixis, chromatin underwent structural alteration similar to what is observed in chromosome stickiness. This is the first report of cytomixis in the genus Brachiaria. Possible origin and implications to pollen fertility are discussed.
Palavras-Chave: | Brachiaria nigropedata; Braquiária; Brasil; Campo Grande; Mato Grosso do Sul.
Thesagro: | Apomixia; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (12535-1) - UPC - SP - -- - 462/06 -  - 462/06 - DIS