Predicting zinc‐enhanced maize hybrid performance under stress conditions

The low yield potential of most biofortified maize is a barrier to its full adoption and reduces curb various macro- micronutrient deficiencies highly prevalent in low-income regions the world, such as sub-Saharan Africa (SSA). By crossing inbred lines with different nutritional attributes zinc (Zn), provitamin A protein quality, breeders are attempting develop agronomically superior stable multi-nutrient genetic backgrounds. key question, however, relationship between per se hybrid performance under stress non-stress conditions. In this study, line testcross were evaluated for grain secondary traits Zn-enhanced normal, quality (QPM) hybrids estimated heterosis combined heat drought (HMDS) well-watered (WW) Responses all traits, except number days mid-anthesis, significantly differed HMDS WW contribution was significant both management levels, although higher mid high-parent observed than However, findings suggest that best determinant HMDS. Strong correlations parents hybrids, indicating can be predicted based on intrinsic performance. Phenotypic correlation This study demonstrated conditions, could their corresponding lines. parental should systematically selected desirable correlated tolerance during development.