Data/hora: 11/06/2024 20:16:31

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 14/05/2004
Data da última atualização: | 29/08/2023
Autoria: | ARAÚJO, M. R. A. de; COULMAN, B. E.
Afiliação: | MARCELO RENATO ALVES DE ARAÚJO, CNPC; BRUCE E. COULMAN, Agriculture and Agri-Food Canada, Saskaton Research Centre.
Título: | Parent-offsprint regression in meadow bromegrass (Bromus riparius Rehm.): evaluation of two methodologies on heritability estimates.
Ano de publicação: | 2004
Fonte/Imprenta: | Canadian Journal of Plant Science, v. 84, n. 1, p. 125-127, Jan. 2004.
DOI: | https://doi.org/10.4141/P02-119
Idioma: | Inglês
Conteúdo: | To determine the nature and extent of inflation of estimates of heritabilities by parent-offspring regression methods, 40 clones of meadow bromegrass (Bromus riparius Rehm.) and their half-sib progenies were studied in completely randomized block design trials, with six replications in Saskatoon and Melfort, Canada. Clones and progenies were evaluated for dry matter yield, seed yield, plant height, fertility index and harvest index. The results of the analysis showed a consistent inflation of heritability estimates derived from the simple parent-offspring regression, when compared to the regression estimate by variance-covariance analysis. The two methods successfully removed the environmental covariances from the estimates. However, in the simple regression analysis, error covariance was not removed from the numerator; therefore, heritabilities estimated by this methodology Were higher than those estimated by the variance-covariance method. It was concluded that estimates derived from variance-covariance analysis provide less biased estimates of heritability.
Palavras-Chave: | Análise de regressão; Correlação genética; Genética quantitativa; Herdabilidade; Poa protensis.
Thesagro: | Genética Molecular; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem.
Thesaurus Nal: | Bromus riparius; Forage grasses; Genetic correlation; Heritability; Meadows; Molecular genetics; Regression analysis.
Categoria do assunto: | --
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (16866-1) - UPC - AP - DD - SP 05364 -  - SP 05364 - DIS