Genetic control of wood density and bark thickness, and their correlations with diameter, in pure and hybrid populations of<i>Eucalyptus grandis</i>and<i>E. urophylla</i>in South Africa

Retief, E.; Stanger, T. K.

doi:10.2989/sf.2009.71.2.10.825

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…The bark percentage ranged from 1.1% to 28.1% and the mean was 14.7% (±0.00), higher than published material by WEI and BORRALHO (1997). RETIEF and STANGER (2009) found that the bark percentage was 7.43 % for E. grandis, 17.31% for E. urophylla, 7.97% for E. grandis ϫ E. urophylla hybrids and 9.50 % for E. urophylla ϫ E. grandis hybrids from control-pollinated families at 75 months in South African. The mean value of WW was 99.57 (±3.39) kg and the maximum value was nearly twenty times than minimum, expressing great variation among clones.…”

Section: Clonal Variation and Repeatabilitymentioning

confidence: 96%

“…Nevertheless, the present wood density values are somewhat lower than those reported for E. urophylla (WEI and BORRALHO, 1997), Eucalyptus camaldulensis Dehnh. (VARGHESE et al, 2008;KIEN et al, 2010), Eucalyptus nitens Maiden (KUBE et al, 2001) and higher than Eucalyptus globulus Labill (APLOLAZA et al, 2005;ISABEL et al, 2001) and Eucalyptus grandis Hill ex Maiden (RETIEF and STANGER, 2009). These BD value are also higher than commercial used hybrid eucalypt clones which ranged from 0.404 to 0.427 g cm -3 sampled at age 51 months in southern China (WU et al, 2011b).…”

Section: Clonal Variation and Repeatabilitymentioning

confidence: 99%

“…Among the genera selected for plantations, Eucalyptus has many characteristics that make it more suitable for short-rotation plantation and become most widely used general commercial plantation in Australia (FORRESTER et al, 2006), Asia (GAN et al, 2004;KIEN et al, 2010;WU et al, 2011b), South America (BERNARDO et al, 1998;LEITE et al, 2002) and South Africa (RETIEF and STANGER 2009) when compared to other species, such as fast-growing, well adaptability, short-rotation, excellent wood properties, vigorous hybrids and large natural genetic populations occur HUANG and DELL, 2002;DANUSEVICIUS and LINDGREN, 2002;KIEN et al, 2009;WARREN et al, 2009). Compared with other Eucalyptus species growing throughout China, Eucalyptus urophylla S.T.…”

Section: Introductionmentioning

confidence: 99%

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Genetic variation and genetic gain in growth traits, stem-branch characteristics and wood properties and their relationships to Eucalyptus urophylla clones

Guang-you

et al. 2013

Silvae Genetica

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Growth traits, wood properties, stem-branch characteristics and bark percentage were assessed for 60 Eucalyptus urophylla S.T. Blake clones in southern China measured at age 21, 52, 71 and 96 months. Analysis of variance showed that there were significant differences on growth traits, wood properties and individual tree wood weight among clones. Coefficients of genotypic variation ranged from 12.12% to 53.16% for growth traits, 9.02% to 20.18% for wood properties, 21.75% to 22.71% for stem-branch characteristics, 28.31% for bark percentage and 51.20% for individual tree wood weight. Repeatability ranged from 0.36 to 0.53 for growth traits, 0.35 to 0.51 for wood properties, 0.21 to 0.24 for stembranch characteristics, 0.07 for bark percentage and 0.31 for individual tree wood weight. The strongly negative genotypic correlations suggesting that selection on growth traits at 21 months can not be effective to predict growth traits at 96 months whereas it could be used to predict growth traits at 52 and 71 months. The genotypic correlations between growth traits and basic density were ranged from -0.78 to 0.28 and weakly positive phenotypic correlations were found between growth traits and basic density, ranging from 0.03 to 0.09. The selection gain on diameter at breast height over bark by different selection proportions at 21, 52, 71 and 96 months old expressed that selection gain at 71 months was some what higher than that at other ages during 10% to 30% selection proportion, while selection gain at 52 months was some what higher than that at other ages during 60% to 90% selection proportion. Wood properties and individual tree wood weight which are strongly related to end production and economically important in pulp production should be studied extensively especially for pulp breeding.

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Section: Clonal Variation and Repeatabilitymentioning

confidence: 96%

Section: Clonal Variation and Repeatabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic variation and genetic gain in growth traits, stem-branch characteristics and wood properties and their relationships to Eucalyptus urophylla clones

Guang-you

et al. 2013

Silvae Genetica

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“…The Eucalyptus urophylla × Eucalyptus grandis hybrid, Eucalyptus urograndis or simply "urograndis", combines disease and drought resistance and exhibits fast growth (Retief and Stanger, 2009), making it one of the most important species in Brazilian forestry. E. urograndis is the main material developed and planted in Brazil, and several commercial clones of this hybrid are available.…”

Section: Introductionmentioning

confidence: 99%

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Colmanetti¹,

Bacha²,

Braga³

et al. 2017

Aust J Crop Sci

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Weeds play a strong pressure on the eucalyptus early growth, leading to a delay in their development. Therefore, many studies have tried to identify eucalyptus clones that are more tolerant to weed competition to supply information to producers, genetic improvement programs and the scientific community. The objective of this study was evaluate the interference of signal grass (Urochloa decumbens) and guinea grass (Panicum maximum) in the early growth of six clones of Eucalyptus urograndis, as well as the reciprocal effect. The experiment was conducted in an open and semi-controlled area in 8-L pots using a completely randomized experimental design with a 3 x 6 factorial scheme (U. decumbens, P. maximum and weed-free control and six eucalyptus clones). After ninety days of planting, the following variables were measured: eucalyptus stem diameter, height, total chlorophyll concentration, chlorophyll fluorescence (Fv/Fm), net assimilation rate and eucalyptus and weed dry biomass. In coexistence with Guinea grass (Panicum maximum), clone 3 (ms 709 H) exhibited a 78.2% reduction in dry biomass compared to clone 4 (C 219 H), which obtained the highest dry biomass. In coexistence with signal grass (Urochloa decumbens), clone 6 (ms 686 H) was the most negatively affected by weed competition, with an 80.7% lower dry biomass than clone 4. In general, clones 1 (ms 710 H), 2 (H 1069) and 4 were more resistant, and clones 3 and 6 were more sensitive to weed interference. Both weeds were affected by eucalyptus, but Guinea grass was more sensitive than signal grass.

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“…In South Africa this genus has received much attention with regard to tree breeding (Pallett and Sale 2004, Retief and Stanger 2009a, Verryn et al 2009) and its interaction with site, management and environment has been studied intensively (Malan 2005, Retief andStanger 2009b). Today, the genus Eucalyptus forms the backbone of the short-fibre kraft pulp industry in South Africa.…”

mentioning

confidence: 99%

Growth and yield models forEucalyptus grandisgrown in Swaziland

Plessis

Kotze²

2011

Southern Forests: a Journal of Forest Science

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The aim of this study was to develop a stand-level growth and yield model for short-rotation Eucalyptus grandis grown for pulp wood production at Piggs Peak in Swaziland. The data were derived from a Nelder 1a spacing trial established with E. grandis clonal cuttings in 1998 and terminated in 2005. Planting density ranged from almost free-growing trees established at 161 trees ha -1 to extremely dense stands at 6 809 trees ha -1 . Functions were fitted to describe stand density, dominant height and basal area development over time. The functions performed well when scrutinised for their goodness of fit. They were also found to be consistent with forest growth theory when their logical behaviour was tested over the range of planting densities.

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Genetic control of wood density and bark thickness, and their correlations with diameter, in pure and hybrid populations ofEucalyptus grandisandE. urophyllain South Africa

Cited by 7 publications

References 8 publications

Genetic variation and genetic gain in growth traits, stem-branch characteristics and wood properties and their relationships to Eucalyptus urophylla clones

Genetic variation and genetic gain in growth traits, stem-branch characteristics and wood properties and their relationships to Eucalyptus urophylla clones

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Growth and yield models forEucalyptus grandisgrown in Swaziland

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