Development of mutant population via insertion of novel transposable elements in soybean

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In terms of exploiting the potential use of SORE-1, a novel retrotransposon in soybean, as a mutagen to produce mutant population, transcriptional and transpositional control of the element was analyzed. Distribution of SORE-1 in the soybean genome, the presence of promoter activity to control transcription in the terminal repeats, and the presence of the environmental and developmental control of SORE-1 transcription were revealed. In addition, evidence that SORE-1 transposed during recent varietal differentiation of soybean, which resulted in polymorphisms in terms of the presence orabsence of gene disruption in a soybean population derived from a single plant line, was obtained.