硝酸还原酶是由底物诱导的,它所催化的NO_3~-→NO_2~-反应是NO_3~-同化为NH_3的限速步骤,因此它在植物氮代谢中占有重要位置。这使我们联想到它可能与作物的耐肥性有一定的内在联系,因为一般在生产上所说的作物的耐肥性就是指作物对外界氮肥的反应特性。本文用27个水稻品种对这一问题进行了初步探讨。供试的籼、粳稻种子在37℃下浸种催芽三天后,排在尼龙网上,在盛满自来水的瓷盘内于25℃下培养,光源为日光灯,光强1,500勒克斯,一天中光暗各12小 Nitrate reductase is induced by substrate. NO_3 ~ - → NO_2 ~ - reaction catalyzed by NO_3 ~ - is the rate-limiting step for the assimilation of NO_3 ~ to NH_3, so it plays an important role in plant nitrogen metabolism. This reminds us that it may be related to the resistance of crops to some degree of inherence, since the so-called crop-resistance of crops, generally referred to in production, refers to the response of crops to external nitrogenous fertilizers. In this paper, 27 rice varieties on the issue of a preliminary study. The indica and japonica seeds tested were soaked for three days at 37 ℃ for three days, then they were arranged on a nylon net and cultured in a porcelain dish filled with running water at 25 ° C. The light source was a fluorescent lamp with a light intensity of 1,500 lux and a light darkness of 12 small