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Greenbug (Homoptera: Aphididae) biotypes characterized using random amplified polymorphic DNA
F O Aikhionbare1, K P Pruess, Z B Mayo
1Department of Biological Sciences, Clark Atlanta University, GA 30314, USA. faikhion@cau.edu
Genetic Analysis : Biomolecular Engineering
|December 3, 1998
Summary
Researchers identified specific DNA markers to differentiate greenbug (Schizaphis graminum) biotypes. These diagnostic primers offer a reliable method for identifying different greenbug strains, crucial for pest management strategies.
Area of Science:
- Molecular Biology
- Entomology
- Genetics
Background:
- The greenbug, Schizaphis graminum, is a significant agricultural pest with distinct biotypes that vary in virulence and host plant resistance.
- Accurate identification of greenbug biotypes is essential for effective pest management and understanding population dynamics.
Purpose of the Study:
- To develop a rapid and reliable molecular method for distinguishing between different biotypes of the greenbug, Schizaphis graminum.
- To identify specific DNA markers that can accurately differentiate laboratory and field-collected greenbug populations.
Main Methods:
- Genomic DNA was extracted from seven greenbug biotypes (B, C, E, F, G, H, and I).
- DNA amplification was performed using single 10-base primers, with 100 primers tested.
- Distinct size differences in amplified DNA fragments were analyzed to identify differentiating markers.
Main Results:
- Four primers were identified that, individually or in combination, reliably distinguished all seven tested greenbug biotypes based on unique banding patterns.
- The diagnostic primer results were repeatable, confirmed by testing aphid samples collected two years apart.
- Field-collected biotype E greenbugs from multiple US states exhibited consistent banding patterns, validating the primers' diagnostic accuracy in natural populations.
Conclusions:
- The developed primer set provides a robust molecular tool for the accurate and efficient identification of Schizaphis graminum biotypes.
- This method facilitates precise pest identification, supporting targeted control strategies and research into greenbug population genetics and evolution.