Genetic correlations between pulpwood and solid-wood selection and objective traits in Eucalyptus globulus
Hamilton, MG and Potts, BM and Greaves, BL and Dutkowski, GW, Genetic correlations between pulpwood and solid-wood selection and objective traits in Eucalyptus globulus, Annals of Forest Science, 67, (5) pp. 511p1-511p10. ISSN 1286-4560 (2010) [Refereed Article]
• If selective breeding is to be successful, significant genetic variation must be present in the traits
targeted for improvement (i.e. "objective traits").
• This study aimed to quantify genetic variation in Eucalyptus globulus pulpwood and sawn-timber
objective traits (rotation-age whole-tree volume, survival, whole-tree basic density, sawn-board Janka
hardness and sawn-board internal checking) and estimate additive genetic correlations between these
and inexpensively-assessed "selection traits".
• Significant genetic variation was identified in all objective traits at the subrace and/or family within
• Selection-age diameter at breast height (1.3 m, DBH) was strongly genetically correlated with
rotation-age volume (0.78) and survival (0.82). Subrace and additive genetic correlations of selectionage
Pilodyn penetration with rotation-age 12-×-12-mm-sample basic density (–0.70 and –0.75 respectively)
and whole-tree basic density (–0.83 and –0.91 respectively) were also strong.
• No significant subrace or additive genetic correlation between wood-sample gross shrinkage and
sawn-board internal checking was detected. However, subrace and additive genetic correlations of
sawn-board Janka hardness with Pilodyn penetration (–0.75 and –0.58 respectively) and sample gross
shrinkage (–0.77 and –0.73 respectively) were significantly different from zero.
• These findings suggest that genetic improvement of the examined objective traits is possible through
selective breeding, although none of the assessed selection traits were strongly correlated with internal