TAILIEUCHUNG - Báo cáo sinh học: "Genetic variation of traits measured in several environments. I. Estimation and testing of homogeneous genetic and intra-class correlations between environments"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic variation of traits measured in several environments. I. Estimation and testing of homogeneous genetic and intra-class correlations between environments | Genet Sei Evol 1995 27 111-123 EIsevier INRA 111 Original article Genetic variation of traits measured in several environments. I. Estimation and testing of homogeneous genetic and intra-class correlations between environments c Robert JL Foulley V Ducrocq Institut national de la recherche agronomique station de génétique quantitative et appliquée centre de recherche de Jouy-en-Josas 78352 Jouy-en-Josas cedex France Received 23 March 1994 accepted 26 September 1994 Summary - Estimation of between family or genotype components of co variance among environments testing of homogeneity of genetic correlations between environments and testing of homogeneity of both genetic and intra-class correlations between environments are investigated. The testing procedures are based on the ratio of maximized log-restricted likelihoods for the reduced under each hypothesis of homogeneity and saturated models respectively. An expectation-maximization EM iterative algorithm is proposed for calculating restricted maximum likelihood REML estimates of the residual and between-family components of co variance. The EM formulae are applied to the multiple trait linear model for the saturated model and to the univariate linear model for the reduced models. The EM algorithm guarantees that co variance estimates remain within the parameter space. The procedures presented in this paper are illustrated with the analysis of 5 vegetative and reproductive traits recorded in an experiment on 20 full-sib families of black medic Medicago lupulina L tested in 3 environments. heteroskedasticity I genetic correlation intra-class correlation I expectationmaximization I restricted maximum likelihood Resume Variation génétique de caractères mesurés dans plusieurs milieux. I. Estimation et test d homogeneite des correlations génétiques et intra-classe entre milieux. Cet article étudie les problèmes d estimation des composantes familiales de co variance entre milieux et les problèmes de test d homogeneite .

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