AFLP mapping and detection of quantitative trait loci (QTLs) for economically important traits in Pinus sylvestris: a preliminary study
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We have applied a two-way pseudo-testcross strategy in an analysis of Pinus sylvestris for genetic mapping and detection of quantitative trait loci (QTLs) associated with economically important traits targeted in the Swedish tree-breeding programme. Based on 94 full-sib progeny of a cross between two plus-trees from northern Sweden we generated two parental maps using AFLP markers. The female map was comprised of 94 markers assigned to 15 linkage groups giving a size of 796 cM. On the male map 155 markers were assigned to 15 linkage groups, giving a total size of 1335 cM. The recombination frequency was found to be sex-dependent, being 29.3% higher in male than in female gametes. On the female map, 12 QTLs were detected (but none for branch diameter or wood density). Three QTLs for tree height accounted for 25.8% of the total phenotypic variation of this trait. When the QTLs detected for all the traits were taken independently, the percentages of phenotypic variance ranged from 9.3% to 22.7%. The highest value was observed for frost hardiness, an important trait in northern Sweden for which a major gene seemed to be involved. A cluster of QTLs for tree height, trunk diameter and volume was located on one linkage group. On the male map, four QTLs for trunk diameter and volume were detected. Due to the reduced number of individuals under study, the results are preliminary and have to be validated on more trees.
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Volume 6, Issue 5 , pp 451-458
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- Kluwer Academic Publishers
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- frost hardiness
- Pinus sylvestris
- QTL mapping
- Industry Sectors
- Author Affiliations
- 1. Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 90183 , Umeå, Sweden
- 2. Station de Recherches Forestières, Laboratoire de Génétique et Amélioration des Arbres Forestiers, BP45, 33610 , Cestas, France
- 3. The Forestry Research Institute of Sweden, P.O. Box 3, 91821, Sävar, Sweden