Characterizing drought stress and trait influence on maize yield under current and future conditions

Area of Science:

• Agricultural Science
• Climate Science
• Genetics

Background:

• Global climate change is projected to intensify drought stress in crops.
• Understanding crop responses to varying drought patterns is crucial for food security.
• Maize (Zea mays L.) is a vital global crop susceptible to water stress.

Purpose of the Study:

• To classify drought-stress typologies and frequencies in European maize.
• To assess the influence of breeding traits on maize yield under diverse drought scenarios.
• To evaluate trait impacts on yield under current and future climate conditions.

Main Methods:

• Utilized novel crop water stress classification to define drought patterns.
• Analyzed historical and projected climate data for European maize cultivation.
• Quantified the effect of anthesis-silking synchrony, maturity, and kernel number on grain yield.

Main Results:

• Four dominant drought-stress patterns were identified, persisting into future climate scenarios.
• Future climates show reduced low-stress conditions and increased severe grain-filling drought.
• Elevated CO2 partially offset negative climate change impacts on maize yield.
• Anthesis-silking synchrony improved yield in low-stress conditions; earlier maturity benefited crops under severe drought.

Conclusions:

• Breeding trait impacts on maize yield are consistent across current and future climates, despite increasing drought severity.
• Targeted breeding strategies considering specific drought-stress patterns are essential for climate change adaptation.
• Findings provide a framework for developing climate-resilient maize varieties.