Flashes of UV-C light are perceived by UVR8, the photoreceptor of UV-B light

Light is an important regulator of plant morphogenesis and plant-pathogen interactions via specific photoreceptors signaling pathways. Besides visible light, other electromagnetic radiations may play roles, notably ultraviolet (UV) light. The UV part the spectrum includes UV-A (315 nm - 400 nm), UV-B (280 315 nm) UV-C (200 280 nm). have been reported to increase resistance pathogens after perception stages. radiation achieved by dimer protein UVR8 (UV RESISTANCE LOCUS 8). Even though action this photoreceptor overlaps in domain, it has never formally demonstrated that could also act as a We provide here original observations showing can indeed perceive light provided latter form flashes (1s) not continuous illuminations (the 60s). Our show response dose-dependent. They explain why are more effective for stimulating defenses than same amount energy delivered plants (J/m2). Eventually, our support ongoing trials aim at using environmental-friendly inducer field conditions.