HORTICULTURE

Detailed explanation-1: -Phytochrome is a chromoprotein. It acts as a photoreceptor in plants. It is sensitive to light in the red and far-red regions. Phytochromes regulate processes linked with photoperiods like flowering, seed germination, chlorophyll synthesis, etc.

Detailed explanation-2: -Eukaryotic Phytochromes Are Protein Kinases.

Detailed explanation-3: -Chemically, phytochrome consists of a chromophore, a single bilin molecule consisting of an open chain of four pyrrole rings, covalently bonded to the protein moiety via highly conserved cysteine amino acid.

Detailed explanation-4: -Chromoproteins: These are composed of simple proteins with chromotropic group as prosthetic group. Examples include hemoglobin (prosthetic group is heme), flavoproteins (prosthetic group is riboflavin), cytochrome (prosthetic group is heme), etc.