MicroRNA397 promotes rice flowering by regulating the photorespiration pathway

文献类型： 外文期刊

第一作者： Lian, Jian-Ping

作者： Lian, Jian-Ping;Yuan, Chao;Zhou, Yan-Fei;Huang, Qiao-Juan;Zhang, Yu-Chan;Chen, Yue-Qin;Feng, Yan-Zhao;Zhu, Qing-Feng;Yu, Yang;Liu, Qing;Wang, Cong-Ying

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2024 年 194 卷 4 期

页码：

收录情况： SCI

摘要： The precise timing of flowering plays a pivotal role in ensuring successful plant reproduction and seed production. This process is intricately governed by complex genetic networks that integrate internal and external signals. This study delved into the regulatory function of microRNA397 (miR397) and its target gene LACCASE-15 (OsLAC15) in modulating flowering traits in rice (Oryza sativa). Overexpression of miR397 led to earlier heading dates, decreased number of leaves on the main stem, and accelerated differentiation of the spikelet meristem. Conversely, overexpression of OsLAC15 resulted in delayed flowering and prolonged vegetative growth. Through biochemical and physiological assays, we uncovered that miR397-OsLAC15 had a profound impact on carbohydrate accumulation and photosynthetic assimilation, consequently enhancing the photosynthetic intensity in miR397-overexpressing rice plants. Notably, we identified that OsLAC15 is at least partially localized within the peroxisome organelle, where it regulates the photorespiration pathway. Moreover, we observed that a high CO2 concentration could rescue the late flowering phenotype in OsLAC15-overexpressing plants. These findings shed valuable insights into the regulatory mechanisms of miR397-OsLAC15 in rice flowering and provided potential strategies for developing crop varieties with early flowering and high-yield traits through genetic breeding. Controlling rice flowering through microRNA397 and LACCASE-15 modifies carbohydrate metabolism and photorespiration, revealing potential strategies for developing early flowering crop varieties.

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