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Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
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Sugars in peach fruit: a breeding perspective.

Marco Cirilli1, Daniele Bassi1, Angelo Ciacciulli1

  • 1Department of Agricultural and Environmental Sciences (DISAA), University of Milan , via Celoria 2, 20133 Milan, Italy.

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Summary

Improving peach quality requires increasing sugar content. This review explores metabolic pathways, phenotyping, and genetic strategies to develop sweeter peach (Prunus persica) varieties for consumers.

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Area of Science:

  • Plant breeding and genetics
  • Fruit quality research
  • Metabolomics and omics sciences

Background:

  • Peach (Prunus persica) consumption is declining due to unsatisfactory fruit quality, particularly low sugar content.
  • Increasing sugar content is a key objective for peach breeding programs to improve market appeal.
  • Classical breeding methods are limited by narrow genetic bases and complex trait inheritance influenced by environment and management.

Purpose of the Study:

  • To review current knowledge on sugar accumulation in peach fruit.
  • To assess advances in phenotyping and genetic approaches for sugar-related traits.
  • To identify research priorities for developing sugar-enhanced peach cultivars.

Main Methods:

  • Literature review of metabolic pathways and physiological mechanisms regulating sugar accumulation.
  • Analysis of current phenotyping methodologies for sugar content in peach.
  • Examination of genetic studies and molecular marker-assisted selection (MAS) or breeding (MAB) strategies.
  • Discussion of 'omics' technologies in peach genetics.

Main Results:

  • Sugar accumulation in peach fruit involves complex metabolic pathways and physiological processes.
  • Phenotyping methods face challenges in addressing within-plant variability for accurate sugar assessment.
  • Molecular markers and advanced genotyping offer potential for efficient selection of high-sugar traits.
  • Understanding the genetic architecture of sugar content is crucial for breeding progress.

Conclusions:

  • Developing sugar-enhanced peach cultivars requires integrating knowledge of metabolic pathways, genetics, and advanced phenotyping.
  • Overcoming limitations in phenotyping and expanding genetic bases are critical for breeding success.
  • Future research should focus on refining phenotyping tools and identifying key genes for sugar traits in peach (Prunus persica).