作者
Takeshi Kuroha,Keisuke Nagai,Rico Gamuyao,Diane Wang,Tomoyuki Furuta,Masanari Nakamori,T Kitaoka,Keita Adachi,Anzu Minami,Yoshinao Mori,Kiyoshi Mashiguchi,Yoshiya Seto,Shinjiro Yamaguchi,Mikiko Kojima,Hitoshi Sakakibara,Jian Wu,Kaworu Ebana,Nobutaka Mitsuda,Masaru Ohme‐Takagi,Shuichi Yanagisawa,Masanori Yamasaki,Ryusuke Yokoyama,Kazuhiko Nishitani,Toshihiro Mochizuki,Gen Tamiya,Susan R. McCouch,Motoyuki Ashikari
摘要
Most plants do poorly when flooded. Certain rice varieties, known as deepwater rice, survive periodic flooding and consequent oxygen deficiency by activating internode growth of stems to keep above the water. Here, we identify the gibberellin biosynthesis gene, SD1 (SEMIDWARF1), whose loss-of-function allele catapulted the rice Green Revolution, as being responsible for submergence-induced internode elongation. When submerged, plants carrying the deepwater rice-specific SD1 haplotype amplify a signaling relay in which the SD1 gene is transcriptionally activated by an ethylene-responsive transcription factor, OsEIL1a. The SD1 protein directs increased synthesis of gibberellins, largely GA4, which promote internode elongation. Evolutionary analysis shows that the deepwater rice-specific haplotype was derived from standing variation in wild rice and selected for deepwater rice cultivation in Bangladesh.