There are 16 direct-use mutant cultivars of soybean registered in Japan since “Raiden” and “Raikou” were developed by Gamma-ray irradiation in 1960. The improved characteristics were early-maturity and latematurity, yellow hilum, seed-coat color, short-stem, and the number of pods/stem, lipoxygenase-free, low allergen etc. Among them, one cultivar was induced by X-ray and the other 15 were induced by Gammarays. The number of indirect-use cultivars is 10. The total cultivated area of mutant cultivars cultivated in the farmers’ fields came to 13,283 ha (9.4% of total cultivated area (142,000ha) of soybean in Japan in 2005) and total farmers’ crude income was 5.56 billion Yen (ca. 52 million US dollars) [4]. As a result, economic impact of mutant cultivars is huge in Japan.
There are 16 direct-use mutant cultivars of soybean registered in Japan since “Raiden” and “Raikou” were developed by Gamma-ray irradiation in 1960. The improved characteristics were early-maturity and latematurity, yellow hilum, seed-coat color, short-stem, and the number of pods/stem, lipoxygenase-free, low allergen etc. Among them, one cultivar was induced by X-ray and the other 15 were induced by Gammarays. The number of indirect-use cultivars is 10. The total cultivated area of mutant cultivars cultivated in the farmers’ fields came to 13,283 ha (9.4% of total cultivated area (142,000ha) of soybean in Japan in 2005) and total farmers’ crude income was 5.56 billion Yen (ca. 52 million US dollars) [4]. As a result, economic impact of mutant cultivars is huge in Japan.
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