The object of the present invention is to obtain a novel transposon-like element specifically present in the genome of rye and the like. According to the present invention, a DNA sequence of a transposon-like element Revolver comprising 3,041 nucleotide pairs, and DNA sequences of structural mutants thereof were provided. The DNA sequence of the transposon-like element Revolver, the DNA sequences of genes having transcriptional activity encoded by Revolver, and the DNA sequences of structural mutants thereof can be utilized for detection of a genome, development of DNA markers, identification of chromosomes, a probe for study on evolution, an entry point of PCR and the like, in useful resource plants of Poaceae.