Intraspecific hybridization in Pinus caribaea var. hondurensis - II. Genetic parameters

Johnston, Amal J., Dieters, Mark J., Dungey, Heidi S. and Nikles, D. Garth (2003) Intraspecific hybridization in Pinus caribaea var. hondurensis - II. Genetic parameters. Euphytica, 129 2: 159-168. doi:10.1023/A:1021935504302


Author Johnston, Amal J.
Dieters, Mark J.
Dungey, Heidi S.
Nikles, D. Garth
Title Intraspecific hybridization in Pinus caribaea var. hondurensis - II. Genetic parameters
Formatted title
Intraspecific hybridization in Pinus caribaea var. hondurensis II. Genetic parameters
Journal name Euphytica   Check publisher's open access policy
ISSN 0014-2336
Publication date 2003
Sub-type Article (original research)
DOI 10.1023/A:1021935504302
Volume 129
Issue 2
Start page 159
End page 168
Total pages 10
Place of publication The Netherlands
Publisher Springer
Language eng
Subject 0706 Horticultural Production
1001 Agricultural Biotechnology
0703 Crop and Pasture Production
Abstract Genetic parameters of growth and stem straightness to seven years of age were estimated from two field populations of pure Pinus caribaea var. hondurensis provenances and their intraspecific hybrids, (Mountain Pine Ridge (MPR) x coastal provenances). There were no consistent differences in the genetic parameter estimates obtained for the parental provenances compared to those from the MPR x coastal inter-provenance hybrid crosses. Narrow-sense heritabilities of growth traits (0.06-0.33) and straightness (0.21-0.50) were within the range of estimates that have been previously reported for this species and other tropical pines. In general, additive variance was found to be more important than dominance variance for growth and straightness traits. There was no strong evidence to affirm that the superiority of the MPR x coastal hybrid could be caused by dominance variance. The low magnitude of the type-B genetic correlations within the MPR x coastal hybrid crosses suggested that the genotype-by-environment interaction might be of practical importance in breeding. For future hybridization of the MPR and coastal provenances, a recurrent selection scheme based on the utilization of additive genetic variance of both parent populations is recommended.
Keyword Agronomy
Plant Sciences
Horticulture
dominance
genetic correlation
genetic parameters
intraspecific hybridization
narrow-sense heritability
Pinus caribaea var. hondurensis
tree breeding
Australia
Performance
Population
Queensland
Selection
Trends
Tests
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Agriculture and Food Sciences
 
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Created: Wed, 17 Oct 2007, 11:47:00 EST