1. bookVolume 68 (2019): Issue 1 (January 2019)
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Journal
eISSN
2509-8934
First Published
22 Feb 2016
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1 time per year
Languages
English
access type Open Access

Maintaining genetic variation in breeding populations of Radiata pine in New Zealand

Published Online: 28 Feb 2019
Volume & Issue: Volume 68 (2019) - Issue 1 (January 2019)
Page range: 9 - 13
Journal Details
License
Format
Journal
eISSN
2509-8934
First Published
22 Feb 2016
Publication timeframe
1 time per year
Languages
English
Abstract

Advanced generation selection (AS) for the future breeding population (BP), becam a focus of tree breeders‘ thinking in the mid 1970s., particularly with Pinus radiata in New Zealand (NZ). Multitrait selection among families was generally recommen­ded, but this reduced genetic variation in the future breeding population. From Shaw and Hood‘s (1985) stochastic simulation, later confirmed by Rosvall, Lindgren and Mullin‘s (1998) stochastic simulation on Norway spruce, it was realised that selecting within families rather than among families of a new breeding population avoided any reduction of genetic variation in the BP. Heritabilities were low for seedling within-family selection but clonal replication within families should strongly increase heritabilities. Gains from cloned versus seedling populations of equal numbers of plants were also deterministically simulated (Shelbourne et al. 2007), and balanced (within-family) selec­tion gains from the cloned populations were all higher than seedling equivalents at heritabilities of 0.5 and under. The late P.A. Jefferson‘s (2016) Breeding Management Plan (which will be soon superceded) contains a re description of New Zealand (NZ) radiata pine breeding. Selections were made in crosses from the earlier program and OP see and scion mate­rial were collected from all 360 selections. OP family tests of selections have been planted at 11 sites in NZ and 7 in New South Wales and Tasmania, and scions of their female parents have all been grafted at an archive. Crosses made in the archive are being cloned and the programme was committed to within-family selection to retain genetic variance for the future closed breeding population. Clonally-replicated testing paired with within-family selection is the solution for balancing long-term gain and diversity in BP and PP.

Keywords

Burdon RD, Shelbourne CJA (1971) Breeding populations for recurrent selection: conflicts and possible solutions. NZ J. For. Sci. 1(2):174-193.Search in Google Scholar

Burdon RD, Shelbourne CJA (1974) The use of vegetative propagules for obtain­ing genetic information. NZ J. For. Sci. 4(2): 418-425.Search in Google Scholar

Burdon RD, Shelbourne CJA, Wilcox MD (1977) Advanced selection strategies. Third World Consultation on Forest Tree Breeding, Canberra and Rotorua.Search in Google Scholar

Burdon RD, Namkoong G (1983) Short note: Multiple populations and sublines. Silvae Genetica 32(5-6):221-222.Search in Google Scholar

Burdon RD (1986) Clonal forestry and breeding strategies-a perspective. Proc. IUFRO Conf. Working Parties on Breeding Theory, Progeny Testing and Seed Orchards. pp. 645-659.Williamsburg, Virginia, p. 645.Search in Google Scholar

Burdon RD (1989) Early selection in tree breeding: principles for applying index selection and inferring input parameters. Can. J. For. Res. 19: 499-504. https://doi.org/10.1139/x89-07610.1139/x89-076Open DOISearch in Google Scholar

Burdon RD, Kumar S (2004) Forwards versus backwards selection: trade-offs be­tween expected genetic gain and risk avoidance. NZ J. For. Sci. 34(1): 3-21.Search in Google Scholar

Danell O (1993) Tree breeding strategy: are we too concerned conservationists but inefficient breeders? Proc. Nordic Group for Tree Breeding. Edinburgh, Scotland, 6-10 October 1993. Ed: Steve J. Lee.Search in Google Scholar

Dungey HS, Brawner JT, Burger F, Henson M, Jefferson PA, Matheson AC (2009) A new breeding strategy for Pinus radiata in New Zealand and New South Wales. Silvae Genetica 58, 1-2. https://doi.org/10.1515/sg-2009-000410.1515/sg-2009-0004Open DOISearch in Google Scholar

Gea LD, Lindgren D, Shelbourne CJA, Mullin T (1997) Complementing inbreed­ing coefficient information with status number: implications for structuring breeding populations. NZJFS 27(3): 255-271.Search in Google Scholar

Jayawickrama KJS, Carson MJ (2000) A breeding strategy for the New Zealand Radiata Pine Breeding Cooperative. Silvae Genetica 49, 2.Search in Google Scholar

Jayawickrama KJS, Carson MJ (2000) A breeding strategy for the New ZealanRa­diata Pine Breeding Cooperative. Silvae Genetica 49, 2.Search in Google Scholar

Jefferson PA (2016) The breeding management plan. RPBC report Nov. 2016Search in Google Scholar

Kumar S, (2006) Correlation between clonal means and seedling progeny means, and its implications for radiata pine breeding strategy. Canadian Journal of Forest Research 36:1968-1975. https://doi.org/10.1139/x06-08210.1139/x06-082Open DOISearch in Google Scholar

Libby WJ (1964) Clonal selection and an alternative seed orchard scheme. Silvae Genetica 13:32-40.Search in Google Scholar

Namkoong G, Snyder EB, Stonecypher RW (1966) Heritability and gain concepts for evaluating breeding systems such as seedling orchards. Silvae Genetica 15(3): 76-84.Search in Google Scholar

Rosvall O, Lindgren D, Mullen TJ (1998) Sustainability, robustness and efficiency of a multi-generation breeding strategy based on within-family clonal se­lection. Silvae Genetica 47(5-6): 307- 321.Search in Google Scholar

Shaw DV, Hood JW (1985) Maximising gain per effort by using clonal replication in genetic tests. TAG 71:392-399. https://doi.org/10.1007/bf0025117810.1007/bf0025117824247443Open DOISearch in Google Scholar

Shelbourne CJA (1969) Tree breeding methods. Technical Paper 55, Forest Re­search Institute, New Zealand Forest Service, Wellington.Search in Google Scholar

Shelbourne CJA, Thulin IJ (1974) Early results from a clonal selection and testing programme with radiata pine. NZ J. For. Sci. 4 (2); 387-398.Search in Google Scholar

Shelbourne CJA, Burdon RD, Carson SD, Firth A, Vincent TG (1986) Development plan for radiata pine breeding. Forest Research Institute, Rotorua, New Zea­land.Search in Google Scholar

Shelbourne CJA (1992) Genetic gains from different kinds of breeding popula­tion and seed or plant production population. South African Forestry Jour­nal 160 March 1992. https://doi.org/10.1080/00382167.1992.9630411 Shelbourne CJA, Kumar S, Burdon RD, Gea LD, Dungey HS (2007) Deterministic simulation of gains for seedling and cloned main and elite breeding popu­lations of Pinus radiata and implications for strategy. Silvae Genetica 56: 253-300. https://doi.org/10.1515/sg-2007-003710.1515/sg-2007-0037Search in Google Scholar

Shelbourne CJA, Burdon RD, Dungey HS, Gea LD, Kumar S (2006) Revisiting the elite. RPBC/Ensis report Brain-storming workshop 28th February 2006.Search in Google Scholar

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