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Related Experiment Videos

Nutrient absorption by Aphidius ervi larvae.

S Caccia1, M G Leonardi, M Casartelli

  • 1Dipartimento di Biologia, Università di Milano, via Celoria 26, 20133 Milano, Italy.

Journal of Insect Physiology
|August 9, 2005
PubMed
Summary

Parasitoid larvae of Aphidius ervi absorb nutrients from their aphid host through both the midgut and epidermis. Specialized GLUT2 transporters facilitate glucose and fructose uptake, crucial for parasitoid development.

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Area of Science:

  • Entomology
  • Insect Physiology
  • Parasitoid Biology

Background:

  • Aphidius ervi parasitoid larvae induce significant changes in aphid hemolymph nutrient composition.
  • Understanding nutrient absorption mechanisms in parasitoid larvae is crucial for their development.

Purpose of the Study:

  • To investigate nutrient absorption pathways in larval stages of the parasitoid Aphidius ervi.
  • To identify the specific tissues and transporters involved in nutrient uptake.

Main Methods:

  • Analysis of nutrient (leucine, glucose, fructose) uptake in 2nd and 3rd instar larvae.
  • Use of larvae with intact or compromised midgut function.
  • Immunofluorescence analysis and inhibition studies with cytochalasin B.

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Main Results:

  • Leucine accumulated in hemocoel only when midgut absorption occurred.
  • Glucose and fructose were readily absorbed and metabolized, with uptake dependent on midgut involvement.
  • Evidence for GLUT2-like transporters in midgut epithelial cells, facilitating sugar influx.

Conclusions:

  • Both midgut and epidermis are essential for nutrient absorption in A. ervi larvae.
  • GLUT2 transporters are responsible for glucose and fructose uptake, driven by maintained chemical gradients.
  • Nutrient mobilization and absorption are key to successful parasitoid development.