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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., Huang, S., Eggler, P., Cross, M., Dale, G., 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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