Ref ID: 11296
Ref Type: Journal (Unpublished)
Authors: Shepherd, M., Huang, S., Eggler, P., Cross, M., Dale, G., Dieters, M. J., and Henry, R. J.
Pub Date: 2005
Journal Name: Molecular Breeding
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Keywords: adventitious rooting/allele/analysis/architecture/breeding/comparative/complex/effect/efficacy/environment/F1/F2/family/gene/genes/genetic/hybrid/hybrids/importance/improvement/loci/locus/marker-aided selection,synthetic hybrids/N/out/outcrossing/P/Pinus/Pinus caribaea var.hondurensis/Pinus elliottii/Pinus elliottii var.elliottii/population/QTL/QTL mapping/quantitative/quantitative trait/quantitative trait loci/south-east Queensland/species/stem cuttings/trait/tree/variation
Abstract: Targeting between-species effects for improvement in synthetic hybrid populations derived from outcrossing parental tree species may be one way to increase the efficacy and predictability of hybrid breeding. We present a comparative analysis of the quantitative trait loci (QTL) which resolved between from within-species effects for adventitious rooting in two populations of hybrids between Pinus elliottii and P. caribaea, an outbred F1 (n = 287) and an inbred-like F2 family (n = 357). Most small to moderate effect QTL (each explaining 2-5% of phenotypic variation (PV)) were congruent (3 out of 4 QTL in each family) and therefore considered within-species effects as they segregated in both families. A single large effect QTL (40% PV) was detected uniquely in the F2 family and assumed to be due to a between-species effect, resulting from a genetic locus fixed for contrasting alleles in each parental species. Oligogenic as opposed to polygenic architecture was supported in both families (60% and 20% PV explained by 4 QTL in the F2 and F1 respectively). The importance of adventitious rooting for adaptation to survive water-logged environments was thought in part to explain oligogenic architecture of what is believed to be a complex trait controlled by many hundreds of genes
Notes: Entered by Mervyn Shepherd (28/09/2005)
Reprint: On Request //
Program: SPF Genetic Improvement
Project: A7; A7
Deliverable: A7-3; A7-3
Confidentiality: Confidential to Genetic Improvement Program Coordinating Committee, All Partners until Published
Availability: Authors
Report: Annual Report 2005/6
Type: Article
Address: mshepher@scu.edu.au
Misc 2: Submitted