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Related Experiment Videos

Ethylene biosynthesis and perception in apple fruitlet abscission (Malus domestica L. Borck).

Valeriano Dal Cin1, Marcello Danesin, Andrea Boschetti

  • 1Department of Environmental Agronomy and Crop Science, University of Padova, Viale dell'Università 16, I-35020 Legnaro (Padova), Italy.

Journal of Experimental Botany
|October 6, 2005
PubMed
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Apple fruit drop is linked to increased ethylene production and sensitivity. This study differentiated between non-abscising and abscising fruitlets, revealing key gene expression changes preceding fruit shedding.

Area of Science:

  • Plant Biology
  • Horticultural Science
  • Molecular Biology

Background:

  • Fruit abscission is a critical process in fruit development and crop yield.
  • Understanding the molecular mechanisms regulating abscission is essential for improving fruit production.

Purpose of the Study:

  • To investigate the role of ethylene biosynthesis and signaling in physiological fruitlet drop in 'Golden Delicious' apples.
  • To compare gene expression related to ethylene in non-abscising and abscising apple fruitlets.

Main Methods:

  • Differential analysis of non-abscising fruitlets (NAF) and abscising fruitlets (AF) induced by benzylaminopurine (BAP).
  • Monitoring fruit shedding rates and ethylene evolution.
  • Transcriptional analysis of ethylene biosynthesis (MdACS5B, MdACO) and action (MdERS1, MdETR1, MdCTR1) genes in various fruit tissues and the abscission zone (AZ).

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Main Results:

  • Abscising fruitlets (AF) showed significantly higher shedding rates (>90%) compared to non-abscising fruitlets (NAF) (<10%).
  • AF exhibited increased ethylene biosynthesis gene expression (MdACS5B, MdACO) and altered ethylene receptor gene expression (MdETR1, MdERS1, MdCTR1).
  • A higher ethylene receptor to ethylene receptor antagonist ratio (ERS/ETR) was observed in AF, suggesting increased sensitivity to ethylene.

Conclusions:

  • Apple fruitlet drop is preceded by stimulated ethylene biosynthesis and enhanced sensitivity to ethylene.
  • Specific ethylene biosynthesis and signaling genes play crucial roles in regulating physiological abscission in apple fruitlets.