QTL Mapping of Several Seed Quality Traits in the DH Population NPZ06 × NPZ09 ( <scp> <i>Brassica napus</i> </scp> L.) for Marker‐Assisted Selection

ABSTRACT Enhancing nutritional quality of oilseed rape requires deeper insight into the genetic control of seed quality traits. This study analysed the effect of varying soil phosphorus (P) levels on seed quality traits in the hybrid cultivar Architect. NIRS and laboratory methods were used to quantify total seed P and phytic acid (IP6) content. A positive correlation was found between soil P availability and seed P accumulation. Within the tested soil P range, oil, protein and glucosinolate contents remained unaffected. A large doubled haploid (DH) population derived from the cross between NPZ06 and NPZ09 was used for QTL analysis. Major QTL were identified for seed oil, protein, the sum of both, seed P, individual fibre components and the seed storage proteins cruciferin and napin. Col‐localisation of QTL revealed genetic interdependencies among traits. For the first time, QTL for total seed P content in oilseed rape were mapped, and candidate genes involved in P uptake and transport (PHO1, PHT, PAP) were located within QTL intervals. These findings support breeding for enhanced seed quality and reduced anti‐nutritional compounds.