photochromogenicity

pho·to·chro·mo·ge·nic·i·ty -.krō-mə-jə-'nis-ət-ē n, pl -ties the property of some microorganisms of producing pigment only when grown in the light or after exposure to light

pho·to·chro·mo·gen·ic -'jen-ik adj

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pho·to·chro·mo·ge·nic·i·ty (fo″to-kro″mə-jə-nisґĭ-te) the property of microorganisms of forming pigment consequent to light exposure; induction occurs within a few minutes in the shorter wavelengths of visible light, pigmentation then occurring within 24 hours if conditions permit continued growth. photochromogenic adj