ABSTRACT
Plants use light for photosynthesis. They also respond to light in other ways. For instance, a germinated seedling grows rapidly to reach light suitable for photosynthesis before its food reserves are exhausted. During this rapid elongation growth, chlorophyll and some chloroplast proteins are not synthesized and the seedling remains etiolated (pale and lacking developed chloroplasts) until light is reached. Then immediately, patterns of gene expression are initiated and the seedling begins to form mature, photosynthetically active chloroplasts and its growth form alters from rapid elongation to the production of leaves and a stem capable of supporting them. This is photomorphogenesis – change of form in
Photomorphogenesis
Photomorphogenesis is the direct influence of light on growth and development. It involves responses to certain wavelengths of light which are perceived by photoreceptor pigments.
