ABSTRACT
Already in the early 20th century, it was shown that light controls growth and development of plants through the action of a signaling photoreceptor separate from the photosynthetic activity.
These studies provided the starting point of an exciting field of research that was subsequently designated photomorphogenesis. In the natural environment, plants are subjected to an array of external signals, such as temperature, gravity, wind, light, and water conditions. Because plants are anchored by their roots to one place for their entire lives, they have to adapt to various changing environmental conditions where they are located.
