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Genetic parameters of intra- and inter-specific hybrids of Eucalyptus globulus and E. nitens

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Abstract

Intra-specific hybrids within Eucalyptus nitens and E. globulus were compared directly with inter-specific E. nitens × globulus using common parents. Diameter (age 2, 4, 6, 10 years) and Pilodyn (age 6 years) were used as indirect measures of growth and wood density, respectively. Genetic parameters were estimated for all cross types and traits. A direct comparison of the general combining ability with the general hybridising ability was made. Heterosis was estimated for intra- and inter-specific hybrids. The intra-specific hybrids in both species exhibit intermediate heritabilities and levels of additive genetic variance. The inter-specific F1 E. nitens × globulus exhibited high incidence of abnormalities at young ages and high levels of later age mortality. The mean performance of surviving inter-specific F1 hybrids was generally intermediate for all traits, to varying degrees, between the parental intra-specific crosses, and there is little evidence for significant heterosis. Different provenances of E. globulus may exhibit different responses to hybridisation. In this case, the inter-specific F1 hybrids, using Taranna E. globulus, appear to perform worse on average than those using King Island provenance for growth traits. There is evidence that specific hybrid families are produced that outperform most of the pure species families for one or other of the traits examined; however, there is no reliable quantitative genetic method of predicting which parents should be used.

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Acknowledgements

The crossing program was carried out while the senior author was employed by CSIRO Division of Forestry and Forest Products with financial assistance provided by the Australian Special Rural Research Fund and North Forest Products (now Gunns Ltd.). Peter Gore, Kim Badcock, Milton Savva and Paul Tilyard provided technical services throughout various stages of the project. The contributions of Rod Griffin, Ken Eldridge, David de Little and Ian Ravenwood in supervision and advice is appreciated.

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  1. Forestry Tasmania, 79 Melville St, Hobart, Tasmania, 7000, Australia

    Peter W. Volker

  2. Co-operative Research Centre for Forestry, Hobart, Tasmania, Australia

    Peter W. Volker & Bradley M. Potts

  3. School of Plant Science, University of Tasmania, Hobart, Tasmania, 7001, Australia

    Peter W. Volker & Bradley M. Potts

  4. Centro de Estudos Florestais, Universidade Técnica de Lisboa, Tapada da Ajuda, 1449-017, Lisbon, Portugal

    Nuno M. G. Borralho

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  1. Peter W. Volker
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Correspondence to Peter W. Volker.

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Communicated by D. Grattapaglia

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Volker, P.W., Potts, B.M. & Borralho, N.M.G. Genetic parameters of intra- and inter-specific hybrids of Eucalyptus globulus and E. nitens . Tree Genetics & Genomes 4, 445–460 (2008). https://doi.org/10.1007/s11295-007-0122-0

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