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对３个玉米品种及其亲本硝酸还原酶活力（ＮｉｔｒａｔｅＲｅｄｕｃｔａｓｅＡｃｔｉｖｉｔｙ下简写ＮＲＡ）测定结果表明，不同生育期ＮＲＡ显著不同，其中拔节期最强，抽雄期急剧降低，到成熟期逐渐变弱；不同品种及其亲本间ＮＲＡ明显不同，特别是各品种不同生育期ＮＲＡ普遍高于其中亲值，尤其拔节期ＮＲＡ显著表现为超双亲；不同品种和亲本籽粒量分别与各生育期ＮＲＡ表现不同程度的正相关关系，其中拔节期相关程度较为密切。
The results of nitrate reductase activity (NRA) in three maize varieties and their parents showed that NRA at different growth stages were significantly different, of which the jointing stage was the strongest, the tasseling stage was drastically reduced and the NRA was gradually weakened at maturity; The NRA of the parents was significantly different, especially the NRA at different growth stages was generally higher than that of the parents, especially at the jointing stage. The NRA at the jointing stage was significantly higher than that of the super parents. The grain yield of different cultivars and parents were positively correlated with NRA at different stages Relationship, in which jointing stage is more closely related.