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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烟草的尼古丁含量有一定的内在联系,因为尼古丁是一种含氮化合物,同时又是氮代谢产物之一。本文对3个烤烟品种和3个晒烟品种的幼苗硝酸还原酶活力进行了初步测定。将供试的烤烟、晒烟种子在25℃下浸种3
Nitrate reductase is induced by substrate, and the 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 have a certain intrinsic relationship with the nicotine content of tobacco because nicotine is a nitrogen-containing compound and at the same time is one of the nitrogen metabolites. In this paper, nitrate reductase activity of three flue-cured tobacco varieties and three sun-cured tobacco varieties were determined. The test flue-cured tobacco, sun-cured tobacco seed soaked at 25 ℃ 3