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


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Costa e Silva, J, Borralho, NMG and Potts, BM 2004 , 'Additive and non-additive genetic parameters from clonally replicated and seedling progenies of Eucalyptus globulus' , TAG Theoretical and Applied Genetics, vol. 108, no. 6 , pp. 1113-1119 , doi: 10.1007/s00122-003-1524-5.

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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.

Item Type: Article
Authors/Creators:Costa e Silva, J and Borralho, NMG and Potts, BM
Journal or Publication Title: TAG Theoretical and Applied Genetics
ISSN: 00405752
DOI / ID Number: 10.1007/s00122-003-1524-5
Additional Information:

BM Potts.
The original publication is available at

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