Elevated Carbon Dioxide and Nitrogen Impact Wheat and Its Aphid Pest

Area of Science:

• Agricultural Science
• Entomology
• Plant Physiology

Background:

• Rising atmospheric carbon dioxide (CO2) affects crop yield and nutritional quality.
• CO2-induced changes in plant physiology can influence insect pest performance.
• The combined effects of elevated CO2 (eCO2) and nitrogen (N) on wheat-aphid interactions are not fully understood.

Purpose of the Study:

• To investigate how eCO2 and varying N application rates impact wheat growth, quality, and the development of the bird cherry-oat aphid.
• To determine if increased N input can mitigate negative effects of eCO2 on wheat quality and aphid performance.

Main Methods:

• Controlled environmental study manipulating N application rates (low, medium, high) and CO2 levels (ambient and elevated).
• Assessed wheat growth, tissue N content, and the fecundity of the bird cherry-oat aphid.
• Quantified the impact of eCO2 and N on aphid development and performance on wheat.

Main Results:

• eCO2 significantly decreased wheat N content by 39% and aphid fecundity by 22% compared to ambient CO2.
• Higher N application increased aphid fecundity and plant N content.
• Increased N application did not fully counteract the negative effects of eCO2 on wheat N content and aphid fecundity.

Conclusions:

• eCO2 poses a significant threat to wheat quality by reducing N content.
• Aphid pest pressure may be reduced under future eCO2 conditions, but N fertilization may not fully offset these effects.
• Understanding these interactions is crucial for managing aphid pests in wheat under changing climate conditions.