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photomorphogenesis The development of plants under the influence of light. All the processes crucial to the growth and development of plants are triggered by light, including seed germination, stem elongation, chloroplast formation, and flowering. These light responses are mediated by various types of light-sensitive molecules, principally phytochrome. It is thought that phytochrome brings about these responses by regulating gene transcription, although the precise mechanisms involved are unknown.
photomorphogenesis The effect of light in regulating plant form and growth.
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