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Melatonin in plant organs.

D L Van Tassel1, N Roberts, A Lewy

  • 1Division of Biological Sciences, University of California, Davis 95616, USA.

Journal of Pineal Research
|August 4, 2001
PubMed
Summary
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Plant melatonin levels do not consistently increase at night. However, melatonin content in tomato fruits rises during ripening, suggesting a role beyond dark signaling.

Area of Science:

  • Plant science
  • Biochemistry
  • Physiology

Background:

  • Melatonin, an indoleamine primarily known for its roles in animals, has been detected in various plant species.
  • Its specific functions in plants remain largely uncharacterized, though animal roles include dark signaling and antioxidant defense.
  • Fruit ripening presents a model for studying oxidative status changes in plant organs.

Purpose of the Study:

  • To investigate the potential role of melatonin in plants, specifically examining its levels during the night and its association with fruit ripening.
  • To determine if melatonin exhibits dark-specific signaling in plants comparable to its function in animals.
  • To analyze the changes in melatonin content in tomato fruits throughout the ripening process.

Main Methods:

Related Experiment Videos

  • Melatonin levels were quantified in organs of Morning glory (Pharbitis nil) and tomato (Lycopersicon esculentum) plants sampled across light/dark cycles.
  • Tomato fruits at different ripeness stages (including overripe) were analyzed for melatonin content.

    • Main Results:

    • No consistent significant increase in melatonin levels was observed in plant organs during nighttime hours.
    • Melatonin content in tomato fruits generally increased with ripening, peaking at the mature ripe stage.
    • A further increase in melatonin was noted as fruits progressed into the overripe stage.

    Conclusions:

    • The findings do not support a significant role for melatonin in dark signaling in the studied plant species.
    • Melatonin accumulation during tomato fruit ripening suggests a potential involvement in fruit development or senescence, possibly related to oxidative processes.
    • Further research is needed to elucidate the precise functions of melatonin in plants.