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Related Concept Videos

Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

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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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Biological Clocks and Seasonal Responses02:45

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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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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Related Experiment Video

Updated: May 5, 2026

Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana
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Induction versus modulation in phytochrome-regulated biochemical processes.

R Oelmüller1, H Mohr

  • 1Biologisches Institut II der Universität, Schänzlestraße1, D-7800, Freiburg, Federal Republic of Germany.

Planta
|November 21, 2013
PubMed
Summary

Phytochrome

Area of Science:

  • Plant Physiology
  • Photomorphogenesis
  • Biochemistry

Background:

  • Phytochrome (Pfr) mediates light responses in plants.
  • Understanding phytochrome's role in regulating biosynthetic pathways is crucial.

Purpose of the Study:

  • To investigate whether phytochrome induces or modulates plant responses.
  • To determine the time course of competence for phytochrome action.

Main Methods:

  • Studied mustard (Sinapis alba L.) cotyledons.
  • Monitored light-mediated formation of anthocyanin and glyceraldehyde-3-phosphate dehydrogenase (GPD).

Main Results:

  • Phytochrome amplifies GPD synthesis after 36 hours.
  • Two competence points for anthocyanin synthesis were identified (26h and 39h).

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  • Phytochrome induces 'early anthocyanin' and amplifies 'late anthocyanin' synthesis.

    • Conclusions:

    • Phytochrome's role in photomorphogenesis involves both induction and modulation.
    • Specific biosynthetic pathways exhibit distinct responses to phytochrome signaling.