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Cereal aphids differently affect benzoxazinoid levels in durum wheat
Reut Shavit1, Zhaniya S Batyrshina1, Nitsan Dotan1
1French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Israel.
Plos One
|December 4, 2018
Summary
Wheat defense compounds, benzoxazinoids, show varied responses to different aphid pests. Understanding these metabolic shifts is key to improving wheat resistance against major crop-damaging insects.
Area of Science:
- Plant Science
- Agricultural Entomology
- Metabolomics
Background:
- Aphids are significant pests in cereal crops, causing substantial yield losses.
- Wheat, a global staple, has poorly understood metabolic responses to aphid infestation, particularly concerning defense compounds.
Purpose of the Study:
- To investigate the metabolic diversity of durum wheat seedlings under attack by three key aphid species.
- To compare wheat's defense compound production (benzoxazinoids) in response to different aphid species.
Main Methods:
- Insect progeny bioassays to assess plant resistance/susceptibility.
- Non-targeted metabolomics using chromatography/Q-Exactive/mass spectrometry.
- Targeted analysis of benzoxazinoid profiles in aphid-infested wheat leaves.
Main Results:
- Differential plant responses observed: susceptible to greenbug (Schizaphis graminum), resistant to English grain aphid (Sitobion avenae), and mildly resistant to bird cherry-oat aphid (Rhopalosiphum padi).
- DIMBOA and DIMBOA-glucoside were induced by S. avenae and R. padi feeding.
- HDMBOA-Glc levels increased with S. avenae and S. graminum feeding, correlating with plant resistance and susceptibility.
Conclusions:
- Wheat exhibits diverse metabolic defense strategies against different aphid species.
- A partial correlation exists between benzoxazinoid induction and aphid reproduction rates.
- Findings highlight the complex plant-insect interactions in wheat-aphid systems.
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