The FERONIA receptor kinase is required for high-humidity responses in Arabidopsis.

FERONIA receptor kinase is required for high-humidity-induced leaf hyponasty in Arabidopsis, and it controls a large portion of high-humidity transcriptomic changes.

• Why it matters: High humidity reshapes plant physiology through known ion channel, CAMTA transcription, and ethylene pathways, but upstream regulators coordinating these responses were unclear.
• What they did: The study tested Arabidopsis high-humidity responses and found FERONIA and its co-receptor LLG1 are needed for many transcriptomic shifts, including CNGC2 and CAMTA-regulated genes, plus cell wall remodeling. It also monitored petiole-localized Ca2+ waves, which precede hyponastic movement and are significantly altered in the fer-4 mutant.
• The result: FERONIA acts as a critical early regulator of high-humidity signaling, linking altered petiole Ca2+ dynamics to downstream gene expression and hyponasty.

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