To clarify the characteristics of dry matter production in selective breeding line of Japanese wild radish, we carried out a study using three cultivars 'Taibyosoubutori', 'Karamaru' and the selected line of Japanese wild radish. The storage root of Japanese wild radish grew slowly. In the Japanese wild radish, total or shoot dry matter weight and dry matter ratio of root were higher, and root dry matter weight was lower than that of 'Taibyousoubutori' at harvest in December 2008. As a results, there were significantly differences in T/R ratio between the selected line and other cultivars. A higher leaf photosynthetic rate was obtained in Japanese wild radish at high light intensity. Our results suggest that Japanese wild radish has a higher source capacity and lower sink capacity in comparison with other cultivars, and the characteristics of dry matter production and sink-source balance of the selected line were largely different from 'Taibyousoubutori'.
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