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Ripening Physiology of Fruit from Transgenic Tomato (Lycopersicon esculentum) Plants with Reduced Ethylene Synthesis.

H. J. Klee1

  • 1Monsanto Company, Chesterfield, Missouri 63198.

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|July 1, 1993
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Summary
This summary is machine-generated.

Transgenic tomatoes with reduced ethylene synthesis ripen slower off-vine but faster on-vine. This highlights ethylene's crucial role in fruit ripening processes.

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Ethylene is a key plant hormone regulating fruit ripening.
  • Understanding ethylene's role is crucial for improving fruit quality and shelf life.

Purpose of the Study:

  • To investigate the physiological effects of reduced ethylene synthesis in transgenic tomatoes.
  • To elucidate the role of ethylene in fruit ripening processes.

Main Methods:

  • Generation of transgenic tomato lines expressing ACC deaminase enzyme.
  • Comparative analysis of ripening rates between transgenic and control fruit (attached vs. detached).
  • Measurement of internal ethylene levels and key ripening-related enzyme activities (ACC oxidase, polygalacturonase).

Main Results:

  • Transgenic tomatoes ripened significantly slower when detached from the vine.
  • Attached transgenic fruit ripened rapidly, comparable to controls, due to higher internal ethylene.
  • No significant differences in ACC oxidase or polygalacturonase levels were observed.
  • Transgenic fruit remained firmer than controls, suggesting alternative softening mechanisms.

Conclusions:

  • Ethylene plays a catalytic role in promoting various aspects of tomato fruit ripening.
  • Reduced ethylene synthesis impacts ripening rate, particularly when fruit are detached.
  • Other enzymes likely contribute significantly to fruit softening independent of ethylene levels.