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Related Experiment Videos

Polyamine levels and tomato fruit development: possible interaction with ethylene.

R A Saftner1, B G Baldi

  • 1U.S. Department of Agriculture, Agricultural Research Service, Beltsville, Maryland 20705.

Plant Physiology
|February 1, 1990
PubMed
Summary
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Tomato cultivar Liberty exhibits slower ripening and longer shelf life. This is linked to reduced ethylene production and higher free polyamine levels during ripening, a key factor in fruit preservation.

Area of Science:

  • Plant Physiology
  • Horticultural Science
  • Biochemistry

Background:

  • Tomato (Lycopersicon esculentum Mill.) fruit ripening is a complex process influenced by ethylene production and polyamine levels.
  • Cultivar differences exist in ripening rates and storage potential, impacting post-harvest quality.

Purpose of the Study:

  • To investigate the relationship between ethylene production, polyamine levels, and fruit development in tomato cultivars with varying ripening characteristics.
  • To understand the biochemical basis for the prolonged keeping quality of the 'Liberty' tomato cultivar.

Main Methods:

  • Quantification of ethylene production in tomato pericarp across different developmental stages.
  • Measurement of free and unconjugated polyamine levels (putrescine, spermidine, spermine, cadaverine) using biochemical assays.

Related Experiment Videos

  • Comparative analysis between 'Liberty', 'Pik Red', and 'Rutgers' tomato cultivars.

    • Main Results:

    • 'Liberty' produced significantly less ethylene (16-38%) compared to 'Pik Red' and 'Rutgers' during fruit development.
    • Putrescine levels declined during early development in all cultivars but increased during ripening in 'Liberty'.
    • 'Liberty' ripe pericarp showed substantially higher free polyamine content (3-6 times) than the other cultivars.

    Conclusions:

    • The elevated free polyamine levels in 'Liberty' ripe pericarp correlate with reduced climacteric ethylene production.
    • These findings suggest that polyamine metabolism plays a crucial role in regulating tomato ripening and extending post-harvest shelf life.