Abstract
The effect of the dwarfing gene from Dee-geo-woo-gen (in-dicated by d-47 in this study) on culm and internode lengths was investigated. Following isogenic dwarf lines were used : the two isogenic lines of d-47 of Shiokari and Taichung 65 (abbreviated to d-47 Iine and d-47(T65) Iine, respectively) ; and Calrose 76 (abbreviated to C76) which contains sd-1 at the same locus as d-47. Three Fl's be-tween the three dwarf lines and their respective parental cultivars, and two kinds of F2 populations were used. Two and three fertilizer levels were set for d-47 Iine and Shiokari, and d-47(T65) Iine and Taichung 65, respectively. The difference between d-47(T65) Iine and Taichung 65 in culm length was 28.0 cm under a condition of basal dress-ing, and the difference was 27% of the culm length of Taichung 65. Those between d-47 Iine and Shiokari were 27.0 cm and 38%. Those between C76 and Calrose were 20.0 cm and 19% . The difference in internode length be-tween each of dwarf lines and its parental cultivar became smaller from the first to 6th internodes.
