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Related Concept Videos

Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Light as Energy

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A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Cell Signaling in Plants

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Light Acquisition

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Channel Rhodopsins01:11

Channel Rhodopsins

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Updated: Jun 28, 2026

Robotic Sensing and Stimuli Provision for Guided Plant Growth
08:02

Robotic Sensing and Stimuli Provision for Guided Plant Growth

Published on: July 1, 2019

Higher plants use LOV to perceive blue light.

Emilie Demarsy1, Christian Fankhauser

  • 1Center for Integrative Genomics, University of Lausanne, Genopode Building, Lausanne, Switzerland. emilie.demarsy@unil.ch

Current Opinion in Plant Biology
|October 22, 2008
PubMed
Summary

Higher plants use blue light receptors, including phototropins and Zeitlupe (ZTL) family proteins, to control growth and development. Light triggers distinct signaling pathways, influencing processes from chloroplast movement to flowering time.

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Analysis of Arabidopsis thaliana Growth Behavior in Different Light Qualities
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Analysis of Arabidopsis thaliana Growth Behavior in Different Light Qualities

Published on: February 2, 2018

Area of Science:

  • Plant molecular biology
  • Photobiology
  • Circadian rhythms

Background:

  • Higher plants utilize diverse blue light receptors to regulate physiological responses.
  • Phototropins and Zeitlupe (ZTL) family proteins share light oxygen voltage (LOV) photosensory domains.
  • Key Arabidopsis thaliana photoreceptors include phot1, phot2, ZTL, LOV Kelch Protein 2 (LKP2), and Flavin-binding Kelch F-box1 (FKF1).

Purpose of the Study:

  • To elucidate the distinct roles and signaling mechanisms of blue light receptors in plants.
  • To understand how light-activated LOV domains in ZTL family members influence protein interactions and activity.
  • To investigate the involvement of GIGANTEA (GI) and FKF1 in regulating CONSTANS (CO) expression and flowering time.

Main Methods:

  • Analysis of blue-light-induced autophosphorylation in phot1 kinase domain.
  • Investigating distinct photosensory specificities of phot1 and phot2.
  • Studying light-modulated interactions between ZTL family proteins and GIGANTEA (GI).
  • Examining the role of GI-FKF1 complex in CONSTANS (CO) repressor degradation.

Main Results:

  • Blue-light-induced autophosphorylation of phot1 is crucial for signal transduction.
  • Phototropin signaling diverges rapidly after activation, mediating specific responses like chloroplast movement and phototropism.
  • Light activation of ZTL family LOV domains alters their interaction with GIGANTEA (GI) and ubiquitin E3 ligase activity.
  • A GI-FKF1 complex promotes the degradation of a CONSTANS (CO) repressor, affecting flowering time.
  • Light-regulated ZTL-GI complex formation limits ZTL's target degradation, impacting the circadian oscillator.

Conclusions:

  • Blue light signaling in plants involves complex photoreceptor networks with distinct functional outputs.
  • Phototropins and ZTL family proteins, through their LOV domains, play critical roles in light perception and downstream signaling.
  • These photoreceptor pathways are essential for regulating diverse developmental processes, including phototropism, chloroplast movement, flowering time, and circadian rhythms.