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Table 3 Putative QTLs for wood density at four years identified by CIM in the E. grandis and E. urophylla backcross mapping families

From: Genetic dissection of growth, wood basic density and gene expression in interspecific backcrosses of Eucalyptus grandis and E. urophylla

Parental map Linkage group cM position LOD Variance (R2) explained by QTL (%) Additive effect (SD)a
F1 hybrid parent (E. grandis BC family) 1 76.3 2.5 3.1 −0.46
4 12.5 3.9* 5.5 −0.56
9 41.5 2.9 4.2 −0.52
F1 hybrid parent (E. urophylla BC family) 2 99.2 2.9 3.3 −0.36
3 82.0 2.9 3.3 −0.36
4 39.7 8.2** 8.2 0.62
6 20.1 4.4** 5.6 −0.50
8 75.7 2.9 3.3 −0.36
9 65.5 11.1** 12.2 0.70
10 16.5 4.0** 6.2 0.53
10 58.8 8.2* 10.8 0.66
E . urophylla BC parent 8 32.0 2.6 5.0 0.46
  1. BC, backcross; CIM, Composite interval mapping; DBH, Diameter at breast height; QTL, Quantitative trait locus; R2, percentage of variance explained; SD, Standard deviation; * Significant at genome-wide α = 0.05; ** Significant at genome-wide α = 0.01.
  2. a Marker data in the F1 hybrid maps were recoded so that positive and negative additive effect values on all linkage groups are associated with the effect of replacement of the E. grandis allele with the E. urophylla allele in backcross progeny. Linkage phases were arbitrary from one linkage group to the next for the backcross parents and the directions of the effects are therefore not indicated for these parents.
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