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What is Photomorphogenesis?

Photomorphogenesis is a developmental process in plants where incoming light determines plant growth. In this model, the growth process of plants is controlled by the photosynthesis available in the plant as energy.


Changes in the growth of an organism in response to the intensity of incident light are known as photomorphogenesis Photomorphogenesis is a process also found in non-plant organisms, such as fungi, protists, and bacteria.

  • The stage in which cells or biological tissues learn the ability to respond to incoming light is known as pattern specification.
  • The stage of photomorphogenesis in which the photoreaction occurs is known as pattern realization.
  • Phytochrome-mediated phot response the blue-light process or the cryptochrome-mediated fluorescence response.

Phytochrome-Mediated Photoresponse

Plant pigments are photoreceptors that plants use to sense the presence of incoming light. These receptors, called phytochrome receptors, are used by plants for several photosynthetic cycles.

Phytochromes are plant pigments that are proteins in nature. These colors absorb sunlight in red and infrared light, as well as in blue light.

The phytochrome-mediated reaction can be divided into three types depending on the amount of light absorbed.

Very low flux reactions- Reactions initiated with very low fluxes of incoming light are known as very low flux reactions or VLFR These reactions are very sensitive to light and are form invariant.

Low current responses- This response is also very sensitive to low current responses to light but less sensitive than VLFR. These images are inherently dynamic.

High Radiation Reactions- Reactions that require prolonged exposure to incoming light are known as high radiation reactions or HIR. H.I.R.


When a seed previously in a completely dark state is exposed to light, it results in the activation of photoreceptors in the seed because the seeds are exposed to electromagnetic radiation, especially red or far-red wavelengths.

Signals are transmitted to the nucleus via signal transduction pathways, stimulating genes responsible for growth and development


Phytochromes are plant pigments that contain photosensitive proteins. These photosensitive pigments act as receptors that help the plant detect incoming light.

Several types of phytochromes exist within the plant that act independently of each other or that can act together in the process of photosynthesis.


Phototropins are photoreceptors that help detect blue light. These help improve photosynthesis. These facilitate plant motility in response to incoming light, root opening, and light-dependent chloroplast movement.

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