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Structural changes in cell wall pectins during strawberry fruit development.

Candelas Paniagua1, Nieves Santiago-Doménech1, Andrew R Kirby2

  • 1Instituto de Hortofruticultura Subtropical y Mediterránea "La Mayora" (IHSM-UMA-CSIC), Departamento de Biología Vegetal, Universidad de Málaga, 29071, Málaga, Spain.

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Summary
This summary is machine-generated.

Strawberry fruit softening during ripening is linked to changes in pectin structure. Pectin nanostructural complexity decreases, leading to increased pectin solubility and reduced fruit firmness, impacting shelf life.

Keywords:
Atomic force microscopyCell wallFragaria × ananassaFruit ripeningFruit softeningPectins

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Area of Science:

  • Plant Biology
  • Food Science
  • Biochemistry

Background:

  • Strawberry (Fragaria × anannasa Duch.) is a commercially important soft fruit.
  • Rapid loss of firmness during ripening leads to significant economic losses due to short shelf life.

Purpose of the Study:

  • To investigate the role of the pectin matrix in strawberry fruit softening.
  • To analyze changes in pectin composition, structure, and nanostructure during fruit ripening.

Main Methods:

  • Sequential extraction and fractionation of strawberry fruit cell walls.
  • Analysis of pectin fractions using Fourier transform infrared spectroscopy, gel filtration chromatography, and atomic force microscopy (AFM).

Main Results:

  • Pectin yield and uronic acid content decreased in ripe fruit, particularly in chelator-soluble (CDTA) and covalently bound (Na2CO3) fractions.
  • Soluble pectins (PAW, water) increased in ripe fruit.
  • Pectin depolymerization occurred in CDTA, water, and PAW fractions, while Na2CO3 pectin size remained unchanged.
  • Nanostructural analysis revealed decreased pectin chain length, branching, and aggregation in CDTA and Na2CO3 fractions of ripe fruit.

Conclusions:

  • Fruit softening correlates with a decrease in the nanostructural complexity of pectins, particularly in CDTA and Na2CO3 fractions.
  • Increased pectin solubilisation and depolymerization contribute to reduced fruit firmness and shelf life.