Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies

Vernyn, S. D.; Snedden, CL; Parfitt, Roy

doi:10.1080/10295925.2000.9631274

Cited by 3 publications

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References 4 publications

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“…Gains in dbh were predicted for the progeny of each trial as if selection was applied by roguing the poorest 30% of the families from each trial, then leaving the best tree per plot of the remaining 70% families standing, followed by bulking of seed from the top 15 to 36 families in each trial. This was done using the formula (Verryn et al 2000):…”

Section: Predicted Genetic Gainmentioning

confidence: 99%

Genetic characterisation of a Eucalyptus nitens base breeding population in South Africa

Swain

Verryn

Laing

2013

Southern Forests: a Journal of Forest Science

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The measurement and statistical analysis of data from eight Eucalyptus nitens trials established in the summer rainfall forestry region of South Africa during the 1980s and 1990s, have enabled the characterisation of the Institute for Commercial Forestry's breeding population. Provenance testing showed that the more northerly New South Wales (Australia) Eucalyptus nitens provenances of Barren Mountain and Barrington Tops are distinctly better suited to the summer rainfall areas of South Africa than the southern New South Wales provenances and the Victorian provenance, Penny Saddle.Generally, the species was not badly affected by Coniothyrium canker. High Type B genetic correlations for all sites pairs, except one comparison, ranged from 0.75 to 0.99 for dbh, indicating very little, or no, genotype-environment interaction for diameter at 1 breast height for the genotypes tested in this study. Narrow sense heritability coefficients ranged from 0.01 to 0.34, indicating that the species generally exhibits sufficient breeding opportunity for improvement of diameter growth. High genetic correlations of greater than 0.90 between diameter measurements at 52 to 62 months after establishment and diameter measurements at 94 or 113 months were found, indicating that selections can be reliably made at five or six years.Predicted genetic gains were highest in the trials at Goedehoop and Arthur's Seat, with increases in diameter at breast height of 3.07 cm (17.1%) and 3.17 cm (20.7%), respectively, at full rotation.

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Section: Predicted Genetic Gainmentioning

confidence: 99%

Genetic characterisation of a Eucalyptus nitens base breeding population in South Africa

Swain

Verryn

Laing

2013

Southern Forests: a Journal of Forest Science

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Genetic parameter estimates and parental selection in Eucalyptus longirostrata and Corymbia henryi populations tested in South Africa

Swain

Louw

2011

Silvae Genetica

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The sub-tropical species,Eucalyptus longirostrata(formerlyE. punctatavarlongirostrata) andCorymbia henryiwere investigated as alternative species for growth on the Zululand coastal plain in South Africa. Provenance/progeny trials were established in 2001 at two sites, namely, Nyalazi and Kwambonambi. The seed material purchased from the Commonwealth Scientific and Industrial Research Organization in Australia in 2000 included six provenances ofE. longirostrataand five provenances ofC. henryi. Six-year diameter at breast height measurements were completed in 2007. Individual narrow-sense heritability coefficients for diameter growth varied from 0.30 to 0.58 for both species, with heritabilities being higher at the drier Nyalazi site. Heritabilities and breeding values were calculated prior to making selections in field. A total of 143 selections were made in theE. longirostratatrials, and 113 in theC. henryitrials during 2008. Predicted gains for the next generation range from 2.8 cm (20%) to 6.1 cm (61%) increase in diameter forE. longirostrata, and 3.4 cm (23%) to 5.4 cm (49%) increase forC. henryi, depending on site and selection scenario. Provenance differences were evident inE. longirostrataat both sites; however, there were no significant differences between theC. henryiprovenances of Australian origin. The top families of both species performed better than the hybrid controls at the Nyalazi site, indicating that bothE. longirostrataandC. henryiare viable alternative species for successful growth on the drier sites of the Zululand coastal plain.

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A comparison of deterministically predicted genetic gains with those realised in a South AfricanEucalyptus grandisbreeding program

Verryn¹,

Snedden²,

Eatwell³

2009

Southern Forests: a Journal of Forest Science

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of genetic gains did deviate (in both directions) from those realised, although these deviations may be explained as functions of imperfect modelling. On average, however, the predicted genetic gains for tree volume over three generations was 13% between generations, whereas the average realised genetic gain in the genetic gains trial was 14%. It is therefore assumed that the E. grandis breeding population is indeed performing as expected, following classical tree breeding assumptions.

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Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies

Cited by 3 publications

References 4 publications

Genetic characterisation of a Eucalyptus nitens base breeding population in South Africa

Genetic characterisation of a Eucalyptus nitens base breeding population in South Africa

Genetic parameter estimates and parental selection in Eucalyptus longirostrata and Corymbia henryi populations tested in South Africa

A comparison of deterministically predicted genetic gains with those realised in a South AfricanEucalyptus grandisbreeding program

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