Detecting ingested plant DNA in soil-living insect larvae
Karin Staudacher1, Corinna Wallinger, Nikolaus Schallhart
1Mountain Agriculture Research Unit, Institute of Ecology, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.
Soil Biology & Biochemistry
|February 15, 2011
Summary
Researchers developed a DNA-based method to track root-feeding insect diets. This new approach successfully detected plant DNA in Agriotes larvae up to 72 hours after feeding, improving our understanding of below-ground food webs.
Area of Science:
- Ecology
- Molecular Biology
- Entomology
Background:
- Below-ground trophic interactions between root-feeding insects and plants are poorly understood.
- Existing methodologies are inadequate for tracking these below-ground feeding relationships.
Purpose of the Study:
- To develop and validate a DNA-based approach for analyzing the dietary choices of root-feeding insects.
- To investigate the detectability of plant DNA in Agriotes larvae over time after feeding.
Main Methods:
- Feeding experiments using Agriotes larvae with wheat or maize.
- Optimization of DNA extraction and Polymerase Chain Reaction (PCR) for small ingested plant matter.
- Utilized universal and specific primers targeting plant plastid DNA (rbcL and trnL).
Main Results:
- Plant DNA was detectable in Agriotes larvae guts up to 72 hours post-feeding using both general and specific primers.
- No significant effect of feeding time on detection success, except for specific maize primers.
- Meal size and larval mass did not influence the detection rate of plant DNA.
Conclusions:
- The developed DNA-based method is effective for identifying plant DNA in the gut contents of root-feeding insects.
- This approach provides a foundation for detailed analysis of soil herbivore diets.
- Enhances understanding of complex animal-plant feeding interactions within soil ecosystems.
