Data/hora: 09/06/2024 01:36:16

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 19/08/2005
Data da última atualização: | 06/10/2005
Autoria: | GONÇALVES, P. de S.; BORTOLETTO, N.; COSTA, R. B. da; SILVA, M. de A.; CARDINAL, A. B. B.; GOUVÊA, L. R. L.
Título: | Estimates of annual genetic parameters and expected gains in the second cycle of Hevea genotype selection.
Ano de publicação: | 2005
Fonte/Imprenta: | Crop Breeding and Applied Biotechnology, Viçosa, MG, v. 5, n. 1, p. 55-63, Mar. 2005.
Idioma: | Inglês
Conteúdo: | Genetic parameters and expected gains with selection were estimated for 13 years of girth and six years of rubber yield in 25 rubber (Hevea brasiliensis) tree genotypes, selected in the northwestern region of Sao Paulo state, Brazil. There were significant differences among genotypes for both the girth growth and annual rubber yield measurements. A decrease of heritability values with increasing tree age was observed. Heritabilities for annual girth growth on the single plot basis varied from hp2=0.45 in the 13 to hp2=0.75 in the third year. For annual rubber yields, the values ranged from hp2=0.60 to hp2=0.80 in the fourth and third year, respectively. The amounts of genetic and phenotypic variation indicate that moderate gain from selection is possible in breeding programmes for annual girth growth while smaller gains can be achieved for annual rubber yield. Genotypic and phenotypic correlation coefficients were generally higher between relatively close ages.
Palavras-Chave: | Broad-sense heritability; Correlação genética; Ganhos genéticos; Genetic gains; Herdabilidades no sentido amplo.
Thesagro: | Hevea Brasiliensis; Seringueira.
Thesaurus Nal: | genetic correlation.
Categoria do assunto: | --
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (22888-1) - ADD - AP - -- - 631.05 - C - 2005.00361 - DIS