punasensitiivinen
Punasensitiivinen refers to a phenomenon where an organism's physiological or behavioral response is triggered or modified by the presence of red light. This is often observed in plants, where photoreceptors like phytochromes are sensitive to red and far-red light, regulating various developmental processes. For example, seed germination, stem elongation, and flowering can be influenced by the red light spectrum. The ratio of red to far-red light is particularly important in signaling shade conditions, which can inhibit germination and promote etiolation (elongated, pale growth).
In some animal species, red light sensitivity might play a role in vision or circadian rhythms, although