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固氮基因的表达受氮调节系统和ｎｉｆＡＬ操纵子的调节控制。ｎｔｒＣ在氮调节和固氮基因表达过程中起关键作用。本文阐述了氮调节系统的基因组成，作用机制和研究进展，并讨论了在联合固氮菌中氮调节基因的作用及工程固氮菌构建的可能途径
Nitrogen-fixing gene expression is regulated by the nitrogen regulatory system and the nifAL operon. ntrC plays a key role in nitrogen regulation and nitrogen fixation of gene expression. This article described the gene composition, mechanism and research progress of nitrogen regulation system, and discussed the role of nitrogen regulation gene in the combination of azotobacter and the possible ways to construct azotobacter