Correlations between pure and hybrid combining abilities of slash pine parents
2003
Brawner, J.T.,Cooperative Research Centre for Sustainable Production Forestry, Hobart (Australia) | Dieters, M.J.,University of Queensland, Brisbane (Australia). School of Food and Land Sciences | Garth Nikles, D.,Queensland Forestry Research Institute, Indooroopilly (Australia)
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.
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por Slovak Library of Forestry and Wood Sciences