QTL mapping for micronutrients concentration and yield component traits in a hexaploid wheat mapping population

Area of Science:

• Agricultural Science
• Plant Genetics
• Nutritional Science

Background:

• Bread wheat is a vital global food source, yet cereal-based diets contribute to widespread nutritional deficiencies.
• Wheat biofortification aims to develop genotypes with enhanced micronutrient content and high yield potential.

Purpose of the Study:

• To identify quantitative trait loci (QTLs) for improved mineral nutrient concentrations (zinc, iron) and agronomic traits in bread wheat.
• To facilitate the integration of these QTLs into breeding programs for enhanced nutritional value.

Main Methods:

• A recombinant inbred line (RIL) population was developed from a cross between high-zinc/iron Chinese wheat and Mexican cultivar Roelfs F2007.
• 200 RILs were evaluated over two years for mineral nutrient concentrations (GZnC, GFeC, GPC) and agronomic traits.
• QTL mapping and candidate gene identification using annotated wheat genome sequences were performed.

Main Results:

• A total of 60 QTLs were detected, including 10 for grain zinc concentration (GZnC), 9 for grain iron concentration (GFeC), and 5 for grain protein concentration (GPC).
• 36 QTLs associated with agronomic traits were also identified.
• 55 candidate genes linked to GFeC and GZnC were identified, alongside promising genomic regions.

Conclusions:

• This study successfully identified significant genomic regions associated with high mineral nutrient concentrations and acceptable yield in bread wheat.
• These findings provide valuable resources for accelerating wheat biofortification breeding efforts to combat global malnutrition.