对12个红麻品种,研究了部份内外调节因子对硝酸还原酶活力的影响。结果表明,提取液成份、离心时速、光照、温度、底物、苗龄等都会影响硝酸还原酶活力。此外还研究了红麻品种硝酸还原酶活力体外测定的稳定性及其衰减速率,以及与品种耐肥性的关系。结果初步揭示稳定性、衰减速率与外部因子及其基因调节功能有关;硝酸还原酶活力与品种耐肥性呈负相关。 The effects of some internal and external regulatory factors on the activity of nitrate reductase were studied on 12 kenaf varieties. The results showed that the composition of extract, centrifugal speed, light, temperature, substrate, seedling age will affect the nitrate reductase activity. In addition, the stability and decay rate of nitrate reductase activity of kenaf varieties in vitro and its relationship with the tolerance of varieties were also studied. The results showed that the stability and the rate of decay were related to the external factors and the gene regulation function. The nitrate reductase activity was negatively correlated with the tolerance of cultivars.