Although resistance to diseases is genetically controlled, the environment has a strong influence on the reaction of plants to pathogens. Thus, the selection of superior genotypes in plant breeding programs can be more efficient the more intrinsically the environmental factors that influence the trait of interest are considered. This study aimed to investigate the adaptive genetic capacity of popcorn maize plants in relation to the occurrence of southern corn leaf blight (SCLB) in contrasting environments regarding nitrogen availability. Gene effects were estimated based on the implementation of a full diallel without reciprocals from which 28 hybrids were obtained. These hybrids, together with their parents, were evaluated in four environments in relation to SCLB reaction. The studied characteristics were area under the disease progress curve, estimated for severity and incidence. The experimental design was a 6 × 6 square lattice with three replications. Significant effects were found on the interactions between genotype, general combining ability, and specific combining ability × environment, demonstrating severe implications of soil nitrogen concentration on the performance of parent lines and hybrids. Dominant gene effects prevailed in the expression of resistance to SCLB. Considering the need for an environmentally and economically sustainable awareness in the control of this disease, it is of interest to take advantage of the heterotic effect contained in the combination L77 × P7, which stood out in relation to the other hybrids for the evaluated environments.

尽管对疾病的抵抗力是通过基因控制的，但环境对植物对病原体的反应有很大的影响。因此，在植物育种程序中选择更好的基因型可能会更加有效，因为从本质上考虑了影响目标性状的环境因素。这项研究旨在调查在氮素可利用性不同的环境下，爆米花玉米植物与南方玉米叶枯病（SCLB）发生有关的适应性遗传能力。基因效果的评估是基于没有互惠的完整二烯醇的实施，从中获得了28个杂种。在与SCLB反应有关的四种环境中评估了这些杂种及其亲本。研究的特征是疾病进展曲线下的面积，估计严重程度和发生率。实验设计是一个6×6方格，具有三个重复。在基因型，一般结合能力和特定结合能力×环境之间的相互作用上发现了显着影响，表明土壤氮浓度对亲本和杂交种的性能产生了严重影响。在对SCLB的抗性表达中占主导地位的基因效应。考虑到在控制该病方面需要在环境和经济上可持续的意识，因此，利用组合L77×P7中包含的杂种效应是很有趣的，该组合相对于其他杂种而言在所评估的环境中脱颖而出。在基因型，一般结合能力和特定结合能力×环境之间的相互作用上发现了显着影响，表明土壤氮浓度对亲本和杂交种的性能产生了严重影响。在对SCLB的抗性表达中占主导地位的基因效应。考虑到在控制这种疾病方面需要在环境和经济上可持续的意识，因此，利用L77×P7组合中所包含的杂种效应是很有意义的，该组合相对于其他杂种而言在所评估的环境中脱颖而出。在基因型，一般结合能力和特定结合能力×环境之间的相互作用上发现了显着影响，表明土壤氮浓度对亲本和杂交种的性能产生了严重影响。在对SCLB的抗性表达中占主导地位的基因效应。考虑到在控制该病方面需要在环境和经济上可持续的意识，因此，利用组合L77×P7中包含的杂种效应是很有趣的，该组合相对于其他杂种而言在所评估的环境中脱颖而出。证明了土壤氮浓度对亲本和杂种表现的严重影响。在对SCLB的抗性表达中占主导地位的基因效应。考虑到在控制该病方面需要在环境和经济上可持续的意识，因此，利用组合L77×P7中包含的杂种效应是很有趣的，该组合相对于其他杂种而言在所评估的环境中脱颖而出。证明了土壤氮浓度对亲本和杂种表现的严重影响。在对SCLB的抗性表达中占主导地位的基因效应。考虑到在控制该病方面需要在环境和经济上可持续的意识，因此，利用组合L77×P7中包含的杂种效应是很有趣的，该组合相对于其他杂种而言在所评估的环境中脱颖而出。