Table 2

Putative QTLs for DBH at age four years identified by CIM in theE. grandisandE. urophyllabackcross mapping families
Parental map Linkage group cM position LOD Variance (R2) explained by QTL (%) Additive effect (SD)a
E. grandis BC parent 9 35.9 3.4 5.5 0.50
F1 hybrid parent (E. grandis BC family) 6 32.9 3.2* 5.0 −0.48
10 89.0 5.9** 8.0 0.63
F1 hybrid parent (E. urophylla BC family) 6 51.0 4.3* 6.6 0.52
E. urophylla BC parent 10 3.0 4.6* 4.6 0.40

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.

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.

Kullan et al.

Kullan et al. BMC Genetics 2012 13:60   doi:10.1186/1471-2156-13-60

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