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Fruit set dependence on carbohydrate availability in citrus trees.

Domingo J Iglesias1, Francisco R Tadeo, Eduardo Primo-Millo

  • 1Departamento de Citricultura y Otros Frutales, Instituto Valenciano de Investigaciones Agrarias, Apartado Oficial, E-46113 Moncada, Valencia, Spain.

Tree Physiology
|February 5, 2003
PubMed
Summary

Citrus fruit set is highly dependent on carbohydrate availability. Enhancing carbohydrate levels through sucrose supplementation can significantly increase fruit set, even counteracting negative effects from defoliation.

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Area of Science:

  • Plant Physiology
  • Agricultural Science
  • Horticulture

Background:

  • Carbohydrate availability is crucial for plant reproductive success.
  • Understanding factors influencing fruit set is vital for citrus crop yield optimization.

Purpose of the Study:

  • To investigate the impact of carbohydrate availability on fruitlet growth and abscission in Satsuma mandarins (Citrus unshiu).
  • To determine the effects of defoliation and sucrose supplementation on citrus fruit set.

Main Methods:

  • Induced source-sink imbalances using partial defoliation and stem sucrose injection in Satsuma mandarin trees.
  • Quantified fruitlet abscission and fruit set percentages.
  • Analyzed sugar concentrations in fruits under different treatments.

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Main Results:

  • Partial defoliation led to increased fruitlet abscission.
  • Sucrose supplementation significantly enhanced citrus fruit set by over 10%.
  • Sucrose supplementation mitigated the negative impact of defoliation on fruit set.
  • Continuous sucrose supply increased soluble and insoluble sugar content in fruits.

Conclusions:

  • Citrus fruit set is strongly influenced by carbohydrate availability.
  • Manipulating carbohydrate levels presents a viable strategy for improving fruit set in citrus cultivation.