Rice Novel Semidwarfing Gene Can Be As Effective As Green Revolution Gene

Gene effects on the yield performance were compared among promising semidwarf genes, namely, novel gene , representative gene with different two source IR8 and Jukkoku, and double dwarf combinations of with each allele, in a Koshihikari background. Compared with the culm length of variety Koshihikari (mean, 88.8 cm), that of the semidwarf or double dwarf lines carrying Jukkoku_, IR8_, , Jukkoku_ plus , or IR8_ plus was shortened to 71.8 cm, 68.5 cm, 65.7 cm, 48.6 cm, and 50.3 cm, respectively. Compared with the yield of Koshihikari (mean, 665.3 g/m), that of the line carrying Jukkoku_ allele showed the highest value (772.6 g/m, 16.1% higher than Koshihikari), while that of IR8_, and IR8_ plus , was slightly decreased by 7.1%, 5.5%, and 9.7% respectively. The line carrying Jukkoku_ also showed the highest value in number of panicles and florets/panicle, 16.2% and 11.1% higher than in Koshihikari, respectively, and these effects were responsible for the increases in yield. The 1000-grain weight was equivalent among all genetic lines. Except for the semidwarf line carrying Jukkoku_, semidwarf line carrying was equivalent to line carrying IR8_in the yield of unpolished rice, and yield components such as panicle length, panicle number, floret number /panicle. Therefore, the semidwarfing gene is one of the best possible choices in practical breeding.