Seeds Hear Rain to Time Germination

A new MIT study finds that statolith calcium crystals in rice seeds can be jostled by sound waves from falling raindrops, and seeds exposed to simulated rain germinated 30–40% faster than controls. The experiment used ~8,000 submerged rice seeds, underwater microphones to validate the acoustic stimulus, and links the mechanosensory role of statoliths to an environmental cue for submergence depth. — If plants commonly use acoustic rain cues to time germination, it matters for agriculture (irrigation timing, seed treatments), restoration ecology, and predictions of plant responses to altered rainfall under climate change.