TAILIEUCHUNG - Báo cáo lâm nghiệp: Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth" | Ann. For. Sci. 62 2005 183-191 INRA EDP Sciences 2005 DOI forest 2005010 183 Original article Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth João Costa e SILVAa Gregory W. DUTKOWSKIb Nuno . Borralhoc a Centro de Estudos Florestais Departamento de Engenharia Florestal Instituto Superior de Agronomia Universidade Técnica de Lisboa Tapada da Ajuda 1349-017 Lisboa Codex Portugal b Cooperative Research Centre for Sustainable Production Forestry School of Plant Science University of Tasmania Private Bag 55 Hobart 7001 Tasmania Australia c RAIZ Forest and Paper Research Institute Herdade da Torre Bela Apartado 15 2065 Alcoentre Portugal Received 10 November 2003 accepted 9 June 2004 Abstract - Height data from six 3-year-old Eucalyptus globulus trials with cloned progenies were jointly analysed with a heterogeneous variances model. Significant heterogeneity between trial sites was detected for additive genetic and environmental variances corresponding to coefficients of variation of 41 and 26 respectively. Two additive genetic and four environmental variances were significantly different from common estimates across all trials. Significant heterogeneity was also detected for heritability estimates which ranged from to . Genetic evaluations of parents and clones within full-sib families were obtained from the heterogeneous variances model and from a simpler model assuming variance homogeneity across trial sites and using either unadjusted data or data pre-adjusted by scale transformations. Changes in predictions of breeding values top ranking genotypes and selection responses were examined to assess the impact of ignoring heterogeneous variances on the genetic evaluation. Clones were more sensitive than parents to the assumption of homogeneous variances in the evaluation model. Nevertheless ignoring variance heterogeneity decreased the response to clonal .

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