Ref ID: 10693
Ref Type: Journal (Unpublished)
Authors: Shepherd, M., Huang, S., Eggler, P., Cross, M. J., Dale, G. T., Dieters, M. J., and Henry, R. J.
Pub Date: 2004
Journal Name: Genetics
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Keywords: additive gene action/adventitious rooting/allele/architecture/characteristic/cutting/cuttings/effect/expression/F1/F2/family/gene/genes/genetic/heterogeneous/hybrid/hybrids/inbreeding/inheritance/initiation/loci/microsatellite/N/oligogenic inheritance/Pinus/Pinus caribaea var.hondurensis/Pinus elliotii var.elliotii/Pinus hybrid/QTL/quantitative/quantitative trait/quantitative trait loci/region/root/south-east Queensland/species/stability/stem/stem cuttings/strike proportion/trait/trend/variance
Abstract: Segregation at genes that delineate species characteristics, best explained stable quantitative trait loci (QTL) expression in heterogeneous hybrid genetic backgrounds. We compared genetic architecture of strike proportion (adventitious root initiation on stem cuttings) in hybrids between two Pinus sp with divergent rooting characteristics. Synteny of QTL in two unrelated families, an outbred F1 (n = 287) and an inbred F2 (n = 357) provided strong evidence of QTL validity and for an oligogenic mode of inheritance. Three of the four genomic regions influencing strike proportion were common to both families and large effects were evident in the inbred F2 (~40% of phenotypic variance). Additive gene action was thought to explain stability of gene expression at different levels of inbreeding, as it predominated at QTL in the inbred F2. To confirm stability of QTL across genetic backgrounds, a second inbred F2 family was assessed. Although, there were no significant associations in this third family, trends in genotypic means were consistent with previously identified directional effects. Favorable alleles originated from both species but at different genes, suggesting complementary gene action may contribute to phenotypic extremes in both outbred F1 and inbred F2
Notes: Entered by Mervyn Shepherd (26/03/2004)
Reprint: In File
Program: SPF Genetic Improvement
Project: A7
Deliverable: A7-3
Confidentiality: Confidential to All Partners until Published
Availability: Online
Report: Annual Report 2003/4
Type: Article
Address: mshepher@scu.edu.au