Abstract
The paper investigates the importance of additive and non-additive genetic variances for growth in Eucalyptus globulus (Tasmanian Blue Gum), based on a large collection of diameter growth data covering 40 sites and more than 4,200 genotypes, most of them cloned, and spanning three generations of breeding. The variance estimates were based on a model accounting for additive, full-sib family and clone within full-sib family terms. The results indicated a small amount of additive genetic variance for diameter \( \left( {{{\widehat{h}}^2} = 0.10} \right) \) and although non-additive genetic variance was also small, it accounted for a significant proportion of the total genetic variance present, corresponding to 80% of the additive variance. The interpretation of these non-additive effects is difficult. The results suggest, however, a possible role of epistasis. The evidence for this came from a strong observed bias in additive variance when clone effects were removed from the model and a larger than expected variance due to full-sib families relative to the variance due to clones within family. The relatively large proportion of genetic variance for growth that seems to be due to non-additive genetic effects has obvious implications in the breeding and deployment options in eucalypts, and these are briefly discussed.


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Araújo, J.A., Borralho, N.M.G. & Dehon, G. The importance and type of non-additive genetic effects for growth in Eucalyptus globulus . Tree Genetics & Genomes 8, 327–337 (2012). https://doi.org/10.1007/s11295-011-0443-x
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DOI: https://doi.org/10.1007/s11295-011-0443-x