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Ethephon induced abscission in mango: physiological fruitlet responses
Michael H Hagemann1, Patrick Winterhagen1, Martin Hegele1
1Section Crop Physiology of Specialty Crops, Institute of Crop Science, University of Hohenheim Stuttgart, Germany.
Frontiers in Plant Science
|October 7, 2015
Summary
Ethylene treatment of mango fruitlets significantly reduces auxin transport and sucrose levels, while upregulating ethylene receptor genes, revealing key mechanisms of fruitlet abscission.
Area of Science:
- Plant Physiology
- Molecular Biology
- Horticulture
Background:
- Mango fruitlet abscission causes significant global production losses.
- Understanding the physiological and molecular basis of abscission is crucial for improving crop yields.
Purpose of the Study:
- To characterize the physiological and molecular events during mango fruitlet abscission.
- To identify key mechanisms underlying ethephon-induced abscission.
Main Methods:
- Ethephon (ethylene-releasing substance) applied at 600 and 7200 ppm to mango fruitlets.
- Assessed polar auxin transport, ethylene receptor gene expression (MiETR1, MiERS1), and sucrose concentration.
Main Results:
- Ethephon treatments reduced polar auxin transport and pericarp sucrose concentration.
- Upregulation of MiETR1 and MiERS1 transcript levels observed, with novel MiERS1 variants detected.
- Higher ethephon concentration (7200 ppm) showed more pronounced effects.
Conclusions:
- Ethephon-induced mango fruitlet abscission involves reduced polar auxin transport, upregulated ethylene receptors, and decreased sucrose levels.
- These findings provide insights into the molecular regulation of fruit abscission.
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