Abstract
Collaborative research trials of Queensland-bred pine hybrids have been established in many sites outside Australia. These trials enable the estimation of genotype×environment effects, which are important in determining the level of regionalization needed in any tree breeding programme. Correlations across sites which are testing hybrids between Pinus caribaea var. hondurensis and both P. oocarpa and P. tecunumanii established in Australia, Swaziland, and Zimbabwe are reported. Diameter at breast height and height were measured in all trials, stem straightness in Australia and Zimbabwe, and wind firmness and lean in Australia, all at 5 years of age. For each pair of tests, additive genetic correlations and the correlation between full-sib family means were estimated for growth traits across sites. Genetic correlations between test-pairs located within the same country were all strong (0.65 to 0.95); however for pairs of tests in different countries the genetic correlations averaged 0.41 and 0.38 for P. oocarpa and P. tecunumanii hybrids, respectively. Family mean correlations were not as strong as genetic correlations, although they followed a similar pattern. A hybrid-production strategy, involving a two-staged approach of (a) reproducing proven superior families for local deployment and (b), crossing parents with high (hybrid) breeding values to produce additional families for testing across a broad range of sites for future deployment, is proposed.
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Claims 6
Claim · model-written summary
Within-country genetic correlations were strong, ranging from 0.65 to 0.95.
Verbatim
e0“Genetic correlations between test-pairs located within the same country were all strong (0.65 to 0.95); however for pairs of tests in different countries the genetic correlations averaged 0.41 and 0.38 for P. oocarpa and P. tecunumanii hybrids, respectively.”
t0“Interspecific pine hybrids II. Genotype by environment interactions across Australia, Swaziland, and Zimbabwe”
Claim · model-written summary
Across-country genetic correlations averaged 0.41 for P. oocarpa hybrids.
- Taxon
- pine hybridst0
- Material
- P. oocarpae0
- Outcome
- genetic correlationse0
- Value
- 0.41e0
- Setting
- different countriese0
Not reportedDirection
Verbatim
e0“Genetic correlations between test-pairs located within the same country were all strong (0.65 to 0.95); however for pairs of tests in different countries the genetic correlations averaged 0.41 and 0.38 for P. oocarpa and P. tecunumanii hybrids, respectively.”
t0“Interspecific pine hybrids II. Genotype by environment interactions across Australia, Swaziland, and Zimbabwe”
Claim · model-written summary
Across-country genetic correlations averaged 0.38 for P. tecunumanii hybrids.
- Taxon
- pine hybridst0
- Material
- P. tecunumaniie0
- Outcome
- genetic correlationse0
- Value
- 0.38e0
- Setting
- different countriese0
Not reportedDirection
Verbatim
e0“Genetic correlations between test-pairs located within the same country were all strong (0.65 to 0.95); however for pairs of tests in different countries the genetic correlations averaged 0.41 and 0.38 for P. oocarpa and P. tecunumanii hybrids, respectively.”
t0“Interspecific pine hybrids II. Genotype by environment interactions across Australia, Swaziland, and Zimbabwe”
Claim · model-written summary
Family mean correlations were weaker than genetic correlations but showed a similar pattern.
Verbatim
e0“Family mean correlations were not as strong as genetic correlations, although they followed a similar pattern.”
t0“Interspecific pine hybrids II. Genotype by environment interactions across Australia, Swaziland, and Zimbabwe”
Claim · model-written summary
The authors propose reproducing superior families for local deployment.
Not reportedDirection
Verbatim
e0“A hybrid-production strategy, involving a two-staged approach of (a) reproducing proven superior families for local deployment and (b), crossing parents with high (hybrid) breeding values to produce additional families for testing across a broad range of sites for future deployment, is proposed.”
t0“Interspecific pine hybrids II. Genotype by environment interactions across Australia, Swaziland, and Zimbabwe”
Claim · model-written summary
The authors propose crossing high breeding-value parents to generate families for broad site testing.
- Taxon
- pine hybridst0
- Outcome
- crossing parents with high (hybrid) breeding values to produce additional families for testing across a broad range of sites for future deploymente0
Not reportedDirection
Verbatim
e0“A hybrid-production strategy, involving a two-staged approach of (a) reproducing proven superior families for local deployment and (b), crossing parents with high (hybrid) breeding values to produce additional families for testing across a broad range of sites for future deployment, is proposed.”
t0“Interspecific pine hybrids II. Genotype by environment interactions across Australia, Swaziland, and Zimbabwe”