Conceptual model of oil determinism in sunflower grains. Reliance on pre- and post-flowering assimilates is indicated. Double-head arrows between both reflects the idea that pre-assimilates are mobilized only when post-flowering assimilates are lacking. Genotype and abiotic factors effects (genotype (G), stress temperature (T), water stress (W), nitrogen (N) and plant density (D)) are represented in blue lines; positive (triggering the component) and negative effects (reducing or blocking the component) are indicated by green cross and red line respectively. It is assumed that plant density effect is globally positive.