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Genetic control of Eucalyptus globulus harvest traits

Citation

Hamilton, MG and Acuna, M and Wiedemann, JC and Mitchell, R and Pilbeam, DJ and Brown, MW and Potts, BM, Genetic control of Eucalyptus globulus harvest traits, Canadian Journal of Forest Research, 45, (6) pp. 615-624. ISSN 0045-5067 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 the Author

DOI: doi:10.1139/cjfr-2014-0428

Abstract

The cost of harvesting short-rotation plantation eucalypts can be in excess of AU$2500Ěha−1. Despite this high cost, the extent to which harvesting productivity is affected by tree genetics is not well understood. We address this issue in a study of two 10-year-old genetic field trials of Eucalyptus globulus Labill. in Australia. Standing-tree traits analysed were survival, diameter at breast height, basal area, and stem straightness and forking. Harvest traits analysed were volume, time, and productivity. Genetic group and within-group genetic variation (additive and dominance), stand-level family variation, phenotypic and genetic correlations, and the effects of inbreeding were estimated for these traits. The different scenarios studied showed that plantation harvest productivity was affected by tree genetics to some degree but was mainly affected through positive covariation with stem diameter. Harvest productivity is thus unlikely to have been adversely affected by past selection. Although no significant additive or dominance genetic variation in stem forking or straightness was detected, weak phenotypic correlations were consistent with harvest productivity being higher in straighter trees with no forking. High inbreeding depression was evident for growth and survival; however, in open-pollinated progeny, this resulted in only a slight reduction in harvest productivity (5.5%) compared with out-crossed progeny.

Item Details

Item Type:Refereed Article
Keywords:harvest productivity, additive genetic variation, dominance genetic variation, inbreeding depression, standing-tree traits
Research Division:Agricultural and Veterinary Sciences
Research Group:Forestry Sciences
Research Field:Tree Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood Plantations
Author:Hamilton, MG (Dr Matthew Hamilton)
Author:Potts, BM (Professor Brad Potts)
ID Code:105643
Year Published:2015
Web of Science® Times Cited:2
Deposited By:Plant Science
Deposited On:2016-01-12
Last Modified:2016-08-01
Downloads:1 View Download Statistics

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