Figure 4.

Detailed graphical display of the QTL detected by a multi-trait QTL analysis on chromosome 3 for relative net root growth (RNRG) after 5 d at {27} µM Al³⁺ in nutrient solution and grain yield (ton ha^–1) under 56% Al saturation stress in the field. The associated tail probability of the Wald statistics, P, is expressed as –log₁₀(p), analogous to the usual LOD score profile. The red horizontal line indicates the significant threshold obtained using the Li and Ji (2005) correction with α = 5%.