Título:	Genetic variation and correlation of agronomic traits in meadow bromegrass (Bromus riparius Rehm) clones.
Autoria:	ARAÚJO, M. R. A. de COULMAN, B.
Afiliação:	Marcelo Renato Alves de Araújo, CNPC; Bruce Coulman, Agriculture and Agri-Food Canada, Saskaton Research Centre.
Ano de publicação:	2004
Referência:	Ciência Rural, Santa Maria, v. 34, n. 2, p. 505-510, mar./abr. 2004.
Conteúdo:	Meadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. As relatively little breeding work kas been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate total genetic variability, broad-sense heritability, phenotypic and genetic correlations. Forty-four meadow bromegrass clones were evaluated for agronomic characters. Genetic variation for dry matter yield, seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral de ter gent fiber and acid de ter gent fiber, was significant. Broad-sense heritability estimates exceeded 50% for all characters. Heritability estimates were at least 3.5 times greater than their standard errors. Phenotypic and genetic correlation between all possible characters were measured There was general agreement in both sign and magnitude between genetic and phenotypic correlations. Correlations between the different characters demonstrated that it is possible to simultaneously improve seed and forage yield. Based on the results, it appears that the development of higher yielding cultivars with higher crude protein, and lower acid and neutral detergent fibers concentration should be possible.
Thesagro:	Gramínea Forrageira Variação Genética
NAL Thesaurus:	Bromus riparius
Palavras-chave:	Melhoramento genético Herdabilidade Correlação genética Correlação fenotípica
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPC)