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Author Spotlight: Sieving Fruit Pulp to Detect Immature Tephritid Fruit Flies in the Field
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Fruit respiration: putting alternative pathways into perspective.

Ariadna Iglesias-Sanchez1, Sergio García-Carbonell1, Alisdair R Fernie2

  • 1Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, Edifici CRAG, Campus UAB, Bellaterra, 08193, Barcelona, Spain.

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Mitochondrial alternative respiratory pathways (ARPs) are crucial for fruit development and ripening, maintaining metabolic balance. Targeting ARPs offers new strategies for enhancing fruit quality and stress resistance.

Keywords:
alternative respiratory pathwaysclimacteric ripeningethylenefruit growthfruit respirationsecondary metabolism

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • Fruit respiration research has evolved from ecophysiology to molecular mechanisms.
  • Mitochondrial Alternative Respiratory Pathways (ARPs) play key roles in fruit growth and ripening.
  • Understanding climacteric vs. nonclimacteric fruit distinctions is enhanced by insights into ARPs.

Purpose of the Study:

  • To review the functional relevance and regulation of ARPs in fruit.
  • To explore the roles of alternative oxidase, uncoupling proteins, and NDIIs.
  • To highlight metabolic flexibility, energy balance, and redox homeostasis in fruits.

Main Methods:

  • Literature review focusing on recent advancements in fruit respiration.
  • Analysis of the roles of specific ARP components (AOX, UCPs, NDIIs).
  • Discussion of metabolic features like CO2 refixation and organic acid metabolism.

Main Results:

  • ARPs are central to metabolic flexibility, energy balance, and redox homeostasis in fruits.
  • Fruit-specific metabolic pathways (C4/CAM-like) and tissue heterogeneity influence respiration.
  • Interactions between respiration, ethylene, and mitochondrial retrograde signaling are critical for ripening.

Conclusions:

  • ARPs are vital for fruit quality, stress resilience, and nutritional value.
  • Targeting ARPs presents novel strategies for postharvest and metabolic engineering.
  • Further research is needed on in vivo flux, energy profiling, and underexplored ARP components.