Plant breeding by using radiation mutation

To improve the crop varieties by using variation, various mutant lines were selected from the materials irradiated with gamma ray due to in vivo and in vitro mutagenesis. The selected mutant lines were evaluated in the agronomic characteristics by field observation and analysis of related DNA patterns in laboratory. the results are summarized as follow; 1. Registered new mutant varieties such as Wonpyeongbyeo, Wonkwangbyeo, Wonmibyeo and Heogseonchalbyeo in the national variety list. 2. Advanced 800 mutant lines of rice soybean perilla and sweet potatoes were selected for radiation genetic resources. 3. Promising rice mutants were evaluated in several district regions for releasing. 4. Bagseul, a new mutant variety of Mugungwha (Hibiscus) were developed. 5. Promising soybean mutant lines were selected for improvement of soybean disease resistant, and soybean seed quality. 6. NaCl resistant cell lines were selected in in vitro and analysed the DNA banks. 7. 5-MT and Cysteine resistant cell lines were obtained from in vitro mutagenesis for improvement of rice quality. 8. Other related researches were carried out with coordinated projects. (author)