DNA-binding with one finger (DOF) transcription factors (TFs) play an important role in gene regulation for the proper growth and development of plants. Ocs-element binding factor (OBF) binding protein 4 (OBP4), an essential member of the DOF TF family, regulates flowering and abiotic stress. However, the functions of OBP4 in rice remain obscure, which limits its potential use in molecular breeding. In this study, rice () was functionally characterized and its role in flowering and abiotic stress was verified. Phylogenetic analysis revealed that OsOBP4 is homologous to OBP4 in . is modulated by salt, osmotic, and abscisic acid (ABA) stresses. Additionally, ectopic expression of complements the phenotype of the mutation by enhancing root development and protecting the photosynthesis system. Under salt stress and short-day conditions, regulated floral development by interacting with AGL7, the upstream component for floral meristem initiation. These results provide evidence for the role of in multiple responses to salt stress and suggest that could be used as a potential candidate gene to improve tolerance to salt stress.

中文翻译：

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水稻 OBF 结合蛋白 4 (OsOBP4) 参与拟南芥开花并调节盐胁迫耐受性

DNA 与一指 (DOF) 转录因子 (TF) 结合在植物正常生长和发育的基因调控中发挥着重要作用。 Ocs 元件结合因子 (OBF) 结合蛋白 4 (OBP4) 是 DOF TF 家族的重要成员，可调节开花和非生物胁迫。然而，OBP4在水稻中的功能仍然不清楚，这限制了其在分子育种中的潜在应用。在这项研究中，对水稻进行了功能表征，并验证了其在开花和非生物胁迫中的作用。系统发育分析表明，OsOBP4 与 中的 OBP4 同源。受盐、渗透压和脱落酸 (ABA) 胁迫的调节。此外，异位表达通过增强根发育和保护光合作用系统来补充突变的表型。在盐胁迫和短日照条件下，通过与花分生组织起始的上游成分 AGL7 相互作用来调节花发育。这些结果为 的在盐胁迫多重反应中的作用提供了证据，并表明可以用作提高盐胁迫耐受性的潜在候选基因。