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
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.
|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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