摘要：Legumes control nodule number through nodulation and autoregulation of nodulation (AON) pathways. Nodule Inception (NIN) is essential for rhizobial infection and nodule organogenesis in legumes. The GmNINa-miR172c-NNC1 (NMN) module, which consists of two positive regulators, GmNINa and miR172c, and a suppressor, NNC1, integrates both pathways. GmNINa activates miR172c to downregulateNNC1,leading to nodulation, while NNC1 inhibits miR172c expression, forming a negative feedback loop. GmNINa and NNC1 interact with each other and antagonistically fine-tuneGmRIC1/RIC2expression, turning AON on and off. Conversely, activation of AON inhibitsGmNINaand miR172c expression, thereby reducing their inhibitory effects on NNC1 to attenuate both nodulation signaling and AON. The NMN module functions not only as an “accelerator” of the nodulation signal to promote nodulation but also as a “brake” on the signal by activating AON to orchestrate nodule number.Graphical AbstractDisplay OmittedPlant Biology; Interaction of Plants with Organisms; Plant Genetics
