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Additive and non-additive genetic parameters from clonally replicated and seedling progenies of Eucalyptus globulus

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Abstract

The first estimates of the importance of epistatic effects within Eucalyptus globulus were obtained from analysis of clonally replicated full-sib progeny tests grown in Portugal. Parents comprised diverse selections from the Portuguese landrace. Variance components were estimated for 4-year-old diameter growth and pilodyn penetration, an indirect measure of wood density, both key traits in the pulpwood breeding objective. The experimental components of variance were used to estimate heritabilities and proportions of the phenotypic variance due to dominance and epistasis. The additive variance was the only significant genetic component affecting either diameter or pilodyn. Estimates of the additive, dominance and epistatic effects accounted for 8–10%, 0–4% and 0.4% of the phenotypic variance in diameter, and for 11–17%, 0% and 5% of the phenotypic variance in pilodyn, respectively. A comparison of residual coefficients of variation within seedling and cloned progenies indicated that C effects within clones were not a serious source of random variability. Despite the test sites encompassing a diverse range of locations, no important genotype by environment interaction was detected. The results suggested that an improvement strategy combining both recurrent selection for additive genetic merit and clonal testing may be adequate for optimizing genetic gains from this genetic base.

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Acknowledgements

We wish to express our gratitude to Dr. Maria Helena Almeida for valuable comments on an earlier version of the manuscript, to Eng. José Alexandre Araújo for helpful technical assistance with the field trials, and to Fundação para a Ciência e Tecnologia (Lisboa, Portugal) for financial support.

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Authors and Affiliations

  1. Centro de Estudos Florestais, Departamento de Engenharia Florestal, Instituto Superior de Agronomia, Universidade Técnica de Lisboa, Tapada da Ajuda, 1349-017, Lisboa Codex, Portugal

    João Costa e Silva

  2. RAIZ Forest and Paper Research Institute, Herdade da Torre Bela, Apartado 15, 2065 , Alcoentre, Portugal

    Nuno M. G. Borralho

  3. Cooperative Research Centre for Sustainable Production Forestry, School of Plant Science, University of Tasmania, Private Bag 55, 7001, Hobart, Tasmania, Australia

    Brad M. Potts

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  1. João Costa e Silva
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  2. Nuno M. G. Borralho
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  3. Brad M. Potts
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Correspondence to João Costa e Silva.

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Communicated by O. Savolainen

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Costa e Silva, J., Borralho, N.M.G. & Potts, B.M. Additive and non-additive genetic parameters from clonally replicated and seedling progenies of Eucalyptus globulus . Theor Appl Genet 108, 1113–1119 (2004). https://doi.org/10.1007/s00122-003-1524-5

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  • DOI: https://doi.org/10.1007/s00122-003-1524-5

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