Genotype × environment interaction, marker-trait association, and SSR validation for grain micronutrient content and yield in wheat (Triticum aestivum L.)

The present study explored the interaction between genotype (G), environment (E), and their interaction (G × E) in determining grain iron content (GFeC), grain zinc content (GZnC), and grain yield per plot (GYPP) in wheat. Thirty-two genotypes were evaluated across eight contrasting environments, revealing significant phenotypic variation for all traits. GGE biplot and AMMI analyses identified Genotypes 14 (‘EU 60’) and 15 (‘EU 61’) as stable performers for micronutrient content, while Genotype 27 (‘MP 1358’) exhibited superior yield stability. A total of 113 significant marker-trait associations (MTAs) were detected, including 42 for GFeC, 23 for GZnC, and 48 for GYPP. Notably, marker trait association (MTAs) Xgwm468.1 and Xgwm538.1 were consistently associated with both GFeC and GZnC, while Xwmc382.4 was common to GFeC and GYPP, suggesting pleiotropy or tight linkage. Marker Xbarc74-5B was validated for GZnC, confirming its reliability for marker-assisted selection. These findings provide valuable genomic resources and phenotypic insights for future breeding programs aimed at developing high-yielding, climate-resilient, and nutrient-rich wheat cultivars.