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Meta-analysis of racial variation in Eucalyptus nitens and E. denticulata


Hamilton, MG and Dutkowski, GW and Joyce, KR and Potts, BM, Meta-analysis of racial variation in Eucalyptus nitens and E. denticulata, New Zealand Journal of Forestry Science, 41 pp. 217-230. ISSN 0048-0134 (2011) [Refereed Article]

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Copyright 2011 New Zealand Forest Research Institute Limited

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Eucalyptus nitens (Deane & Maiden) Maiden is widely planted in temperate regions of the southern hemisphere, principally for pulpwood production. Eucalyptus denticulata I.O. Cook & P.Y. Ladiges was previously recognised as an informal variant of E. nitens and, accordingly, was included in many ‘E. nitens’ field trials. We reviewed data from 85 E. nitens/E. denticulata field trials, located in Australia, Chile, China, Italy, Lesotho, New Zealand, South Africa and Zimbabwe and ranging in age from less than one year to 14 years, to investigate racial (among population groups) genetic variation in growth, wood-property, tree-architecture, fitness and morphological/developmental traits. Meta-analyses were undertaken on these data to gauge the significance of differences among races across trials. Race × rainfall zone interaction was also investigated by categorising field trials as summer-rainfall, winter-rainfall or nursery-based. Race × rainfall zone interaction was significant for growth traits only. In general, Central Victorian E. nitens populations outperformed New South Wales E. nitens populations in winter-rainfall zones, but this ranking was reversed in summer-rainfall zones. On average, E. denticulata grew less rapidly than the best-performing E. nitens races, particularly in winter-rainfall zones. Differences among races were detected in basic density, a commercially important trait, but these differences were small in magnitude. Significant differences among races were also evident in branch size and stem form (straightness). Eucalyptus denticulata races had significantly thinner branches than all E. nitens races except Southern Central Victorian, and Central Victorian E. nitens races generally had the straightest stems. The small number of trials represented for most traits limited the power of meta-analyses but significant differences among races detected in our study are likely to represent consistent and robust differences across a broad range of environments.

Item Details

Item Type:Refereed Article
Keywords:fitness; genetic variation; genotype × environment interaction; growth; morphology; population; provenance; race; tree architecture; wood properties.
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Gene mapping
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Hamilton, MG (Dr Matthew Hamilton)
UTAS Author:Dutkowski, GW (Mr Greg Dutkowski)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:75892
Year Published:2011
Web of Science® Times Cited:6
Deposited By:Plant Science
Deposited On:2012-02-20
Last Modified:2012-08-21

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