The transcriptional regulator MOS1 attenuates salinity stress-induced seed germination inhibition via negative feedback regulation of ABA signaling in Arabidopsis.

MOS1 reduces salt stress-induced seed germination inhibition in Arabidopsis by negatively regulating ABA signaling pathways, with a 50% increase in salt sensitivity observed in mos1 mutants.

• Why it matters: Understanding how seed germination responds to salt stress is crucial for improving plant resilience and crop yields in saline environments, yet the regulatory mechanisms remain unclear.
• What they did: Researchers identified MOS1 as an attenuator of salt-induced germination inhibition, showing its expression is salt-induced and partly dependent on ABA biosynthesis and signaling, using genetic and molecular analyses.
• The result: MOS1 limits ABA biosynthesis and responsiveness during salt stress, with higher ABA levels and ABA gene expression in mos1 mutants, suggesting MOS1's role in fine-tuning germination under salinity via ABA and GA pathway modulation.