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Related Concept Videos

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.
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...

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Related Experiment Video

Updated: Jun 8, 2026

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

The dark side of clock-controlled flowering.

Vicente Rubio1, Xing Wang Deng

  • 1Department of Plant Molecular Genetics, Centro Nacional de Biotecnología-CSIC, Darwin 3, Campus UAM, Cantoblanco, Madrid,28049, Spain. vrubio@cnb.csic.es

F1000 Biology Reports
|October 16, 2010
PubMed
Summary

Plants use day length to regulate daily rhythms and flowering time. Recent research reveals this process involves both light and dark periods, offering new molecular insights.

Area of Science:

  • Plant biology
  • Chronobiology
  • Molecular genetics

Background:

  • Plants rely on seasonal cues, like day length, to synchronize biological processes.
  • Photoperiodism is crucial for regulating plant development, including flowering time.
  • Understanding the molecular mechanisms of photoperiodism is key to crop improvement.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying plant photoperiod perception.
  • To investigate the role of both light and dark phases in regulating plant rhythms.
  • To identify key genetic factors involved in seasonal timing.

Main Methods:

  • Utilizing molecular biology techniques to study gene expression patterns.
  • Employing genetic analysis to identify regulatory pathways.

Related Experiment Videos

Last Updated: Jun 8, 2026

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

  • Conducting physiological experiments to assess plant responses to light and dark cycles.

    • Main Results:

    • Identified specific photoreceptors and signaling pathways involved in day length perception.
    • Demonstrated that the dark phase is as critical as the light phase for accurate seasonal timing.
    • Uncovered novel molecular components regulating plant biological rhythms.

    Conclusions:

    • Plant seasonal timing is a complex process involving intricate light and dark sensing mechanisms.
    • This research provides a deeper understanding of the molecular basis of photoperiodism.
    • Findings have implications for optimizing crop flowering and yield in changing environments.