Data/hora: 06/06/2024 00:57:04

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 23/02/2018
Data da última atualização: | 11/05/2018
Autoria: | ALVES, G. F.; FIGUEIREDO, U. J. de; PANDOLFI FILHO, A. D.; BARRIOS, S. C. L.; VALLE, C. B. do.
Afiliação: | GEOVANI F. ALVES; ULISSES J. de FIGUEIREDO, Universidade Federal de Lavras; ANTÔNIO D. PANDOLFI FILHO, Universidade Federal do Espírito Santo; SANZIO CARVALHO LIMA BARRIOS, CNPGC; CACILDA BORGES DO VALLE, CNPGC.
Título: | Breeding strategies for Brachiaria spp. to improve productivity: an ongoing project.
Ano de publicação: | 2014
Fonte/Imprenta: | Tropical Grassland - Forrajes Tropicales, v. 2, p. 1-3, 2014.
ISSN: | 2346-3775
Idioma: | Inglês
Conteúdo: | Two strategies have been used in the breeding of Brachiaria (syn. Urochloa) to produce new cultivars. The first involves exploring the natural variability exist-ing in nature, which is the selection of ecotypes, mostly apomicts, from the diversity in germplasm banks. This strategy proved efficient originally and the cultivars in use in Brazil were derived in this way, but progress with this strategy is limited in the medium to long term. The generation of novel variability through crossings is the alternative strategy to continue producing new improved varieties. This has been possible only through artificial chromosomal duplication of diploid and sexual B. ruziziensis and the fact that this species is cross-compatible with B. brizantha and B. decumbens, in Bra-zil the 2 most important species for tropical pastures. Crossings between species have been carried out at Embrapa Beef Cattle, Campo Grande, MS, Brazil, since 1988 (Valle et al. 1993, 2001; Valle 1997; Resende et al. 2007). The initial success in obtaining interspecific hy-brids in Brachiaria is indisputable and helped establish a practical methodology as well as allowed for the identi-fication of apomictic parents with good combining abil-ity. However, a comprehensive genetic improvement strategy to benefit from gains in quantitative characteris-tics associated with the majority of agronomic traits of economic interest in these species had not been started. Therefore, 3 methodologies are being used for this pur-pose: reciprocal recurrent selection; intra-population recurrent selection; and directed crosses between sexual and apomictic plants. The last 2 strategies are already underway and the strategies for agronomic evaluations are reported here.
Thesagro: | Brachiaria; Produtividade.
Thesaurus Nal: | Apomixis; Interspecific hybridization; Tropical pastures.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (17071-1) - UPC - AP - DD -  -  -  - DIS