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<p>The study highlights the impact of drought stress at different phenological stages and different carbon dioxide concentrations on the growth and productivity of four Hungarian winter wheat varieties (‘Mv Ikva’, ‘Mv Nádor’, ‘Mv Nemere’, ‘Mv Kolompos’). The experiments were performed at the HUN-REN Centre for Agricultural Research and the experimental setting contained three different watering regimes (optimal watering as control, water withdrawal at the stem elongation, water withdrawal at the heading developmental stage as drought treatment) and three different carbon dioxide levels (current atmospheric, 700&#xa0;ppm or 1000&#xa0;ppm). Our findings contribute to a better understanding of how atmospheric conditions, including elevated CO<sub>2</sub> levels, might interact with drought stress to influence wheat growth. At current atmospheric CO<sub>2</sub> concentration drought experienced during the early developmental stage caused a significant reduction in several measured parameters compared to drought occurring at the heading stage. At elevated CO<sub>2</sub> levels (700&#xa0;ppm and 1000&#xa0;ppm), the drought-induced reductions in plant height were generally less severe. Drought stress during stem elongation significantly reduced spike weights, at 700&#xa0;ppm CO<sub>2</sub> concentration, the early-stage drought had a stronger negative impact on this parameter than the late-stage drought. Early drought significantly reduced the grain number in the main spikes under ambient CO<sub>2</sub> levels, while heading-stage drought primarily affected the secondary spikes.</p>

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Responses of winter wheat (Triticum aestivum L.) varieties to drought stress and elevated CO2 levels: a comparative analysis of growth, spike characteristics, and grain yield

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月24日

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  • Zsuzsanna Farkas,
  • Balázs Varga

摘要

The study highlights the impact of drought stress at different phenological stages and different carbon dioxide concentrations on the growth and productivity of four Hungarian winter wheat varieties (‘Mv Ikva’, ‘Mv Nádor’, ‘Mv Nemere’, ‘Mv Kolompos’). The experiments were performed at the HUN-REN Centre for Agricultural Research and the experimental setting contained three different watering regimes (optimal watering as control, water withdrawal at the stem elongation, water withdrawal at the heading developmental stage as drought treatment) and three different carbon dioxide levels (current atmospheric, 700 ppm or 1000 ppm). Our findings contribute to a better understanding of how atmospheric conditions, including elevated CO2 levels, might interact with drought stress to influence wheat growth. At current atmospheric CO2 concentration drought experienced during the early developmental stage caused a significant reduction in several measured parameters compared to drought occurring at the heading stage. At elevated CO2 levels (700 ppm and 1000 ppm), the drought-induced reductions in plant height were generally less severe. Drought stress during stem elongation significantly reduced spike weights, at 700 ppm CO2 concentration, the early-stage drought had a stronger negative impact on this parameter than the late-stage drought. Early drought significantly reduced the grain number in the main spikes under ambient CO2 levels, while heading-stage drought primarily affected the secondary spikes.