Pyramiding of multiple strong-culm genes originating from indica and tropical japonica to the temperate japonica rice oleh Taiichiro Ookawa, Tomohiro Nomura, Eri Kamahora, Mingjin Jiang, Yusuke Ochiai, Ahmad Fahim Samadi, Takuya Yamaguchi, Shunsuke Adachi, Keisuke Katsura, Takashi Motobayashi