Data/hora: 17/06/2024 13:06:13

Biblioteca(s): | Embrapa Soja.
Data corrente: | 25/05/1993
Data da última atualização: | 26/10/2004
Autoria: | DAYDE, J.; ECOCHARD, R.; COUSTAUT, V.
Afiliação: | Ecole Nationale Superieure Agronomique, 145. Av. Muret, 31076, Toulouse Cedex, France.
Título: | Heredity and breeding of determinate or semi-determinate soybeans: a quantitative approach.
Ano de publicação: | 1989
Fonte/Imprenta: | In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.
Volume: | t.2
Páginas: | p.968-973.
Idioma: | Inglês
Conteúdo: | In Europe the mendelian model of Bernard (1972) does not account for the behaviour of determinate x indeterminae segregations. A continuous unimodal variation with trangressions is more representative, and two indices were found to correctly describe the phenotypes:  K= vegetative growth duration / total cycle duration x "R" stage at the end of vegetative period (Vidal et al. 1984)  RHR1= plant height at R1 stage / plant height at maturity.  The heredity of these criteria was studied in crosses involving analysed in 1m distant planting design. Later on, parents, F2 and F3 (including full-sib relationships) were studied with elimination of interplant competitions in a 17 cm x 17 cm pattern. The genetic model involved partition of the phenotypic variances andcovariances into their sigma (expoente 2, indice A), sigma (expoente 2, indice D), sigma (expoente 2, indice AA) and sigma (expoente 2, indice E). The narrow sense heritability of both traits was high (between) 0.60 and 0.98). Rather lower but very significant also were the heritability values of earliness and plant height at maturity, also studied among other morphological or architectural traits not presented here. Contribution of epistasis (sigma [expoente 2, indice AA] component) was found to be remarkedly high for K as well as for RHR1. Therefore we conclude that, if quantitative genes play an important role in the heredity of these traits, participation of major genes cannot be rejected. This hypothesis, though it does not confict with Bernard's model,
Palavras-Chave: | Franca; Soybean.
Thesagro: | Genética; Melhoramento; Soja.
Thesaurus Nal: | breeding; France; genetics.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)