Wood and fibre productivity potential of promising new eucalypt species for coastal Zululand, South Africa

Gardner, Robin; Little, Keith M.; Arbuthnot, Athol

doi:10.1080/00049158.2007.10676261

Cited by 26 publications

(17 citation statements)

References 17 publications

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“…As well, the end-product or 469 processing may place restrictions on the rate at which some traits are allowed to be 470 changed in the genetic improvement program. For example, in a South African 471 study that included Corymbia species, the species' wood density was found to be 472 higher than the optimal range desired for local pulp mills but quite suitable for a chip 473 export markets (Gardner et al 2007). Using the results presented in Figure 2 …”

Section: Near Here 332mentioning

confidence: 99%

Selection ofCorymbia citriodorafor pulp productivity

Brawner

Meder

Dieters

et al. 2012

Southern Forests: a Journal of Forest Science

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10Evaluation of a series of spotted gum (Corymbia citirodora) progeny trials, 11 established in the subtropical region of Queensland, Australia, was undertaken to 12 provide information for the development of advanced generation breeding 13 populations suitable for pulp production. Measurements of growth at two ages were 14 combined with assessments of wood density and pulp yield from a selected sample 15 of provenances to provide comparisons between provenances, to generate genetic 16 parameter estimates and to predict genetic gain potential. While growth at this age 17 was moderate relative to other eucalypts the near infrared predictions of average 18 wood density of 756 kg/m 3 and pulp yield of 55% indicate the species has 19 considerable potential as a pulpwood crop. A pulp productivity breeding objective 20 was used to identify production populations using a range of selection trait 21 weightings to determine potential genetic gain for pulp productivity. Genetic 22 parameters indicated: 1) levels of genetic control were moderate for all traits and 23 higher for wood property traits, 2) genetic improvements could be achieved by 24 selection among and within provenances with greater levels of improvement 25 available from selection within populations, 3) genotype by environment interactions 26 were negligible, 4) genetic correlations between traits were favourable, and 5) 27 selection of volume production alone would maximise improvements in pulp 28 productivity. 29

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Section: Near Here 332mentioning

confidence: 99%

Selection ofCorymbia citriodorafor pulp productivity

Brawner

Meder

Dieters

et al. 2012

Southern Forests: a Journal of Forest Science

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“…The remaining taxa showed high levels of variation across trials, and had relatively lower wood density than the aforementioned three taxa. assessed in this study was higher than that previously reported in Gardner et al (2007) and similar to that reported for CCV . Variation in wood density is often associated with growth rates; i.e.…”

Section: Variation In Wood Properties Of Taxa Across Trialscontrasting

confidence: 56%

“…These taxa showed the most consistent wood density across trials, ranging from 717 to 795 kg/m 3 for CCC, 716 to 797 kg/m 3 for CCV and 708 to 783 kg/m 3 for E. moluccana respectively. While this is generally positive, wood density at this level may be above the ideal range for Kraft pulping (Gardner et al 2007). The remaining taxa showed high levels of variation across trials, and had relatively lower wood density than the aforementioned three taxa.…”

Section: Variation In Wood Properties Of Taxa Across Trialsmentioning

confidence: 99%

“…Significant site effects for pulp yield and wood density have been reported for spotted gums (Corymbia citriodora subsp. citriodora [CCC] and Corymbia henryi) with the species demonstrating lower wood density and greater pulp yield on a wetter site than at the far drier site (Gardner et al 2007). In comparison with the results from previous studies on pulp yield and wood density for spotted gums (Clark & Hicks 2003;Gardner et al 2007;Harding et al 2009a), the mean values of KPY values were similar; however, wood density estimates were higher in the present study.…”

Section: Site Effectsmentioning

confidence: 99%

“…While KPY and DEN of eucalypts have been a focus of several studies (e.g. Gardner et al 2007;Lee et al 2011;Brawner et al 2012), little has been published for either MOE or MfA. Lee (2007), Lee et al (2009), Johnson et al (2009 have reported on tree-improvement activities and genetic control of key traits in the spotted gums.…”

Section: Introductionmentioning

confidence: 99%

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NIR for combined selection in hardwoods for both growth and wood properties

Tran¹

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of a thesis submitted to The University of Queensland for the degree of Doctor of Philosophy Near infrared (NIR) spectroscopy provides an inexpensive and rapid alternative to traditional laboratory methods for estimation of wood properties. Its advantages are well-known as an appropriate approach for tree improvement programs where assessment of a large number of trees is usually required and elite individual trees need to be retained for use as future parents. Hence, tree breeders are beginning to realise the potential of this technology for the selection of species, taxa, provenances, families and individual trees with superior wood quality.Forest products are consumed worldwide for multiple purposes to support daily living. Many of these products are sourced from planted forests. In north-eastern Australia large areas of hardwood plantations have been established in the last 15 years; however, due to poor tree species selection, significant areas have failed. Research to support hardwood plantation development in north eastern Australia included the establishment of taxa trials across multiple sites in Queensland and northern New South Wales. Previous work involving this trial network focused primarily on the growth and survival of the various taxa and species included, and identified a number of promising species, including Corymbia citriodora subsp. variegata (CCV) and Eucalyptus pellita. In this thesis, the initial focus was to evaluate the most promising hardwood taxa across a subset of well-replicated and linked trials, to identify the taxa most suitable for solid wood and pulpwood production across the diverse environments of north-eastern Australia. The second focus was to assess open-pollinated families within different provenances (or seed sources) in two key studied species (CCV and E. pellita) to investigate the genetic control of key wood properties, and relationships among wood and growth traits. Here near infrared spectroscopy was used to rapidly and cost effectively assess the wood properties of these taxa across multiple trial sites and methods developed to deal with unbalanced representation of taxa/species across and within trials. This thesis aims to address the following research questions: hierarchical clustering to facilitate grouping of trials into classes based on similarity in the performance of individual taxa; and, principal component analysis to analyse the pattern of performance across sites. Finally, a deterministic simulation was constructed to demonstrate the impact of different weightings for each trait on predicted genetic gains in both CCV and E. pellita.After the initial introduction chapter, the second chapter of the thesis provides information on the productivity and wood properties of examined species/taxa, thence a more robust basis for taxa selection across geographical locations in north-eastern Australia during the first 10 years of age can be better understood. The third and fourth chapters investigate a range of genetic parameterestimates based on open-pol...

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Are tree breeders properly predicting genetic gain? A case study involving Corymbia species

et al. 2018

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The estimation of quantitative genetic parameters in breeding programs is important to ensure efficient selection. In this context, knowledge of the mating system is critical, as it underpins assumptions about inter-relatedness on which variance component estimation depends. However, proper account of the breeding system is not always taken, either because it is unknown and/or because it is ignored. That eucalypts have a mixed-mating system is well-established, however many breeders use models that assume outcrossed mating with an infinite number of male parents (i.e. allogamous mating), from which genetic parameter estimates are then used to predict genetic gains. First-generation, open-pollinated progeny tests of Corymbia citriodora subsp.

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Wood and fibre productivity potential of promising new eucalypt species for coastal Zululand, South Africa

Cited by 26 publications

References 17 publications

Selection ofCorymbia citriodorafor pulp productivity

Selection ofCorymbia citriodorafor pulp productivity

NIR for combined selection in hardwoods for both growth and wood properties

Are tree breeders properly predicting genetic gain? A case study involving Corymbia species

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