In contrast, as shown in Figure 4, the effect of a semidwarf gene (or genes) on panicle length (−3.0 to +2.5%), which was smaller than that for internode intervals (−16 to −92%), was negligible in practical agriculture. Particularly, the mean length of panicles in the line carrying Jukkoku_sd1 was 16.2 cm, which was solely 2.5% longer than that of Koshihikari. The panicle length of the line carrying Jukkoku_sd1 was longer than that of the original cultivar Koshihikari: not only the mean value but also the value including the standard deviation caused by circumstance. Therefore, there was certain merit in increasing the production of Jukkoku_sd1 as compared to other semidwarf genes.