Data/hora: 23/06/2024 10:07:36

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 09/11/2011
Data da última atualização: | 09/11/2011
Autoria: | RICCI, G. C. L.; SOUZA-KANESHIMA, A. M. de S.; FELISMINO, M. F.; MENDES-BONATO; PAGLIARINI, M. S.; VALLE, C. B. do.
Afiliação: | GLÉIA CRISTINA LAVERDE RICCI, UEM; ALICE MARIA DE SOUZA-KANESHIMA, UEM; MARIANA FERRARI FELISMINO, UEM; ANDREA BEATRIZ MENDES-BONATO, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC.
Título: | Chromosome numbers and meiotic analysis in the pre-breeding of Brachiaria decumbens (Poaceae).
Ano de publicação: | 2011
Fonte/Imprenta: | Journal of Genetics, v. 90, No. 2, p. 289-294, Aug. 2011.
Idioma: | Inglês
Notas: | Indian Academy of Sciences.
Conteúdo: | A total of 44 accessions of Brachiaria decumbens were analysed for chromosome count and meiotic behaviour in order to identify potential progenitors for crosses. Among them, 15 accessions presented 2n = 18; 27 accessions, 2n = 36; and 2 accessions, 2n = 45 chromosomes. Among the diploid accessions, the rate of meiotic abnormalities was low, ranging from 0.82% to 7.93%. In the 27 tetraploid accessions, the rate of meiotic abnormalities ranged from 18.41% to 65.83%. The most common meiotic abnormalities were related to irregular chromosome segregation, but chromosome stickiness and abnormal cytokinesis were observed in low frequency. All abnormalities can compromise pollen viability by generating unbalanced gametes. Based on the chromosome number and meiotic stability, the present study indicates the apomictic tetraploid accessions that can act as male genitor to produce interspecific hybrids with B. ruziziensis or intraspecific hybrids with recently artificially tetraploidized accessions. In this paper we determined the chromosome number and evaluated the meiotic behaviour of 44 accessions of B. decumbens available at Embrapa Beef Cattle (Brazil) as a subsidy for the breeding programme.
Palavras-Chave: | Braquiaria.
Thesagro: | Brachiaria Decumbens; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem.
Categoria do assunto: | K Ciência Florestal e Produtos de Origem Vegetal
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (14242-1) - UPC - AP - DD -  -  -  - DIS