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Congruence in QTL for adventitious rooting in Pinus elliottii x Pinus caribaea hybrids resolves between and within-species effects

Shepherd, M. and Huang, S. and Eggler, P. and Cross, M. and Dale, G. and Dieters, M. and Henry, R. (2006) Congruence in QTL for adventitious rooting in Pinus elliottii x Pinus caribaea hybrids resolves between and within-species effects. Molecular Breeding, 18 (1). pp. 11-28.

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Article Link(s): http://dx.doi.org/10.1007/s11032-006-9006-5

Publisher URL: http://www.springerlink.com

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 with 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 F 2 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.

Item Type:Article
Corporate Creators:Horticulture and Forestry Science
Additional Information:© Springer Netherlands.
Keywords:Marker-aided selection; rooting percentage; stem cuttings; synthetic hybrids.
Subjects:Science > Biology > Genetics > Quantitative genetics (esp. Quantitative Trait Loci (QTL) articles)
Plant culture > Propagation
Science > Botany
Deposited On:12 Jan 2009 07:04
Last Modified:09 Jun 2011 23:45

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