Data/hora: 01/06/2024 02:40:35

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 13/03/1995
Data da última atualização: | 13/03/1995
Autoria: | FIROOZABADY, E.; OLMO, H. P.
Afiliação: | University of California.
Título: | Heritability and correlation studies of certain quantitative traits intable grapes (Vitis spp).
Ano de publicação: | 1987
Fonte/Imprenta: | Vitis, v.26, p.132-146, 1987.
Idioma: | Inglês
Notas: | Separata.
Conteúdo: | Heritabilities and phenotypic correlations among 10 traits of the grapevine (Vitis vinifera x V. rotundifolia hybrid derivatives) were estimated from measurements obtained from 46 families, including a total ofmore than 1000 offspring generated by crosses among 26 parents. Measurements on fruit characters were obtained over a period of 4 years, 1976-1979. (General vigor of the vines was measured in only 1 year, 1976). Prior to this analysis the data on fruit traits were statistically adjusted to mitigate the confouding effects of fluctuating annual climates on estimates of genotypic value. The heritabilities were then estimated by regressing the average perfomance of each seedling on the average perfomance of its mid-parent. Heritabilities are 0.12, 0.55, 0.49, 0.75, 1.04, 0.34, 0.15 and 0.10 for cluster weight, cluster compactness, berry weight, skin texture, pulp texture, total soluble solids, acidity of juice and general vigor, respectively. The heritability estimate for crop weight in this population is practically 0 (-0.08). The precision of these estimates is very high, except for that of general vigor. Thus, they should be reliable predictors of the rate of genetic gain attainable in such populations when seedlings are selected as parents on the basis of their own performance. The expected performance of the progeny of randomly mated parents, ranked in the upper 5% of the progeny generation, were estimated. The implications of these genetic relationships on the effectiveness and efficiency of breeding...
Palavras-Chave: | Melhoramento genetico; Videira.
Thesagro: | Crescimento.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (3745-1) - EMB - SP - -- -  -  - 1988.00023 - DIS