Correlations between pure and hybrid combining abilities for slash pine parents

Brawner, J. T., Dieters, M. J. and Nikles, D. G. (2004) Correlations between pure and hybrid combining abilities for slash pine parents. Forest Genetics, 10 3: 241-248.

Author Brawner, J. T.
Dieters, M. J.
Nikles, D. G.
Title Correlations between pure and hybrid combining abilities for slash pine parents
Journal name Forest Genetics   Check publisher's open access policy
ISSN 1335-048X
Publication date 2004-01-13
Sub-type Article (original research)
Volume 10
Issue 3
Start page 241
End page 248
Total pages 8
Editor L. Paule
Place of publication Zvolen, Slovakia
Publisher Arbora Publishers
Language eng
Subject 070507 Tree Improvement (Selection and Breeding)
0705 Forestry Sciences
1001 Agricultural Biotechnology
Abstract Four trials were analysed to provide taxa comparisons for growth and stem quality as well as genetic parameters for Queensland bred Pinus elliottii (Pee) and P. elliottii × P. caribaea var. hondurensis (Pch) F1 hybrids. Of particular interest was the genetic correlation between related progenies in pure species and hybrid combination (rph), or equivalently the correlation between the general combining ability (GCA) and general hybridising ability (GHA). Pee families produced less volume than either the PCH controls or the F1 hybrid families and exhibited slightly more crown defects than either of the other two taxa. The heritability estimates were very high for the F1 hybrid trials but moderate to low in the pure Pee trials. Type-B genetic correlations were high within the same taxa giving further evidence of the low levels of genotype by environment interaction found within southeast Queensland for these two taxa. Pearson correlations between univariate GCA and GHA estimates provided similar rph estimates to those obtained directly from multivariate analyses. There was no correlation between the GHA and GCA estimates for the 56 Pee parents represented in this study for growth traits; however, a high and positive correlation was found for straightness. While straightness in hybrids may be selected for using pure Pee progeny trial data, growth traits in pure and hybrid progeny of Pee appear to be uncorrelated. Field testing of F1 hybrid families or poly-crossed Pee parents prior to operational deployment or inclusion in more intensive clonal screening programs will continue to be necessary if resources are to be focused on the very best hybrid families.
Keyword Genetic correlations
P.elliottii x P.caribaea var. hondurensis
Pinus elliottii
Q-Index Code C1

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: Tue, 24 Mar 2009, 00:27:58 EST by Ms Karen Naughton on behalf of School of Land, Crop and Food Sciences