A promoter comprising any one selected from the group consisting of the nucleotide sequence of SEQ ID No: 7, the nucleotide sequence of SEQ ID No: 8, the nucleotide sequence of SEQ ID No: 9, the nucleotide sequence of SEQ ID No: 10, the nucleotide sequence of SEQ ID No: 11 and the nucleotide sequence of SEQ ID No: 12, which is capable of inducing the expression of a downstream gene of the promoter under the presence of nitrate.