Chloroplasts balance energy production and stress resilience via a cold-induced signaling pathway.
Chloroplasts utilize a RAF3/6 kinase module to coordinate energy production and stress responses during cold stress, with RAF6 variation linked to cold adaptation.
- Why it matters: Understanding how chloroplasts respond to cold stress is vital for improving plant resilience and productivity in changing climates, yet the mechanisms remain largely unknown.
- What they did: The study identified RAF3/6 kinases that translocate into chloroplasts upon cold stress, phosphorylate photosystem components, and activate nuclear cold-defense genes, using molecular and genetic analyses.
- The result: This signaling pathway enables plants to balance photosynthesis and stress resilience, with natural RAF6 variation indicating an evolutionary adaptation to cold environments.