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Related Experiment Videos

Ethylene biosynthesis in fruit tissues.

A H Baur1, S F Yang, H K Pratt

  • 1Department of Vegetable Crops, University of California, Davis, California 95616.

Plant Physiology
|May 1, 1971
PubMed
Summary
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Methionine is converted to ethylene in avocado during ripening, suggesting biosynthesis control occurs after methionine synthesis. This conversion requires oxygen and active methionine turnover for high ethylene production.

Area of Science:

  • Plant Physiology
  • Biochemistry
  • Horticultural Science

Background:

  • Ethylene is a key plant hormone regulating fruit ripening.
  • The precise metabolic pathway and regulatory points of ethylene biosynthesis are not fully elucidated.
  • Methionine's role as a direct precursor to ethylene has been investigated.

Purpose of the Study:

  • To investigate the conversion of methionine to ethylene in avocado during ripening.
  • To determine the stage-specific regulation of ethylene biosynthesis.
  • To compare methionine and its keto analogue as ethylene precursors in apple.

Main Methods:

  • Tracer studies using radiolabeled methionine in avocado tissues.
  • Analysis of endogenous methionine content.

Related Experiment Videos

  • Oxygen dependency assays for methionine to ethylene conversion.
  • Comparative studies of methionine and alpha-keto-gamma-methylthiobutyric acid in apple tissues.

    • Main Results:

    • Methionine conversion to ethylene occurs during avocado climacteric rise and peak, but not pre-climacteric.
    • Endogenous methionine levels are low, indicating active turnover for ethylene production.
    • The conversion of methionine to ethylene is oxygen-dependent.
    • Methionine is a closer ethylene precursor than its keto analogue in apple.

    Conclusions:

    • Ethylene biosynthesis regulation in avocado is post-methionine synthesis.
    • Active methionine turnover is crucial for high ethylene production during ripening.
    • Oxygen is essential for methionine to ethylene conversion, highlighting a key regulatory step.