Rice Ethylene-Response AP2/ERF Factor OsEATB Restricts Internode Elongation by Down-Regulating a Gibberellin Biosynthetic Gene

• DOI: 10.1104/pp.111.179945
• Publication Date: 2011-07-14T00:19:30Z
• Authors: Weiwei Qi; Fan Sun; Qianjie Wang; Mingluan Chen; Yunqing Huang; Yu-Qi Feng; Xiaojin Luo; Jinshui Yang
• Keywords: Panicle; Elongation; Ethephon; Ectopic expression; Tiller (botany); Plant stem

Abstract Plant height is a decisive factor in plant architecture. Rice (Oryza sativa) plants have the potential for rapid internodal elongation, which determines height. A large body of physiological research has shown that ethylene and gibberellin are involved this process. The APETALA2 (AP2)/Ethylene-Responsive Element Binding Factor (ERF) family transcriptional factors only present kingdom. This various developmental functions. rice AP2/ERF gene, OsEATB (for ERF protein associated with tillering panicle branching) was cloned from indica variety 9311. Bioinformatic analysis suggested new function. Ectopic expression showed cross talk between gibberellin, mediated by OsEATB, might underlie differences internode elongation. Analyses gene demonstrated restricts ethylene-induced enhancement responsiveness during elongation process down-regulating biosynthetic ent-kaurene synthase A. negatively correlated tiller number, higher yields typically obtained dwarf crops. reduces length at maturity, promoting branching both tillers spikelets. These useful traits breeding high-yielding