ABSTRACT

Light is energy and is an information source for plant growth and development. The absolute requirement of light is the key feature that distinguishes the plants from the animals. Phytochromes are the wellcharacterized plant proteins that perceive the light as an environmental signal to control growth and development. The phytochromes belonging to the principal family of red/far-red light signal-transducing photoreceptors undergo photochromic transformation between the inactive (Pr) and the active (Pfr) forms to mediate the growth and development of plants.