How do drought and heat affect the response of soybean seed yield to elevated O3? An analysis of 15 seasons of free-air O3 concentration enrichment studies

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Shuai Li, Christopher M. Montes, Elise K. Aspray, Elizabeth A. Ainsworth
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Abstract

The coincidence of rising ozone concentrations ([O3]), increasing global temperatures, and drought episodes is expected to become more intense and frequent in the future. A better understanding of the responses of crop yield to elevated [O3] under different levels of drought and high temperature stress is, therefore, critical for projecting future food production potential. Using a 15-year open-air field experiment in central Illinois, we assessed the impacts of elevated [O3] coupled with variation in growing season temperature and water availability on soybean seed yield. Thirteen soybean cultivars were exposed to a wide range of season-long elevated [O3] in the field using free-air O3 concentration enrichment. Elevated [O3] treatments reduced soybean seed yield from as little as 5.3% in 2005 to 35.2% in 2010. Although cultivars differed in yield response to elevated [O3] (R), ranging from 17.5% to −76.4%, there was a significant negative correlation between R and O3 dosage. Soybean cultivars showed greater seed yield losses to elevated [O3] when grown at drier or hotter conditions compared to wetter or cooler years, because the hotter and drier conditions were associated with greater O3 treatment. However, year-to-year variation in weather conditions did not influence the sensitivity of soybean seed yield to a given increase in [O3]. Collectively, this study quantitatively demonstrates that, although drought conditions or warmer temperatures led to greater O3 treatment concentrations and O3-induced seed yield reduction, drought and temperature stress did not alter soybean's sensitivity to O3. Our results have important implications for modeling the effects of rising O3 pollution on crops and suggest that altering irrigation practices to mitigate O3 stress may not be effective in reducing crop sensitivity to O3.

Abstract Image

Abstract Image

干旱和高温如何影响大豆种子产量对高浓度 O3 的响应?对 15 季自由空气中 O3 浓度富集研究的分析
预计未来臭氧浓度([O3])升高、全球气温升高和干旱的叠加将变得更加剧烈和频繁。因此,更好地了解不同程度的干旱和高温胁迫下作物产量对[O3]升高的反应对于预测未来粮食生产潜力至关重要。通过在伊利诺伊州中部进行为期 15 年的露天田间试验,我们评估了[O3]升高以及生长季温度和水分供应变化对大豆种子产量的影响。利用自由空气中的臭氧浓度富集技术,将 13 个大豆栽培品种暴露于大范围的季节性[O3]升高环境中。高浓度[O3]处理使大豆种子产量降低,从 2005 年的 5.3% 降至 2010 年的 35.2%。虽然栽培品种对高浓度[O3](R)的产量反应不同,从 17.5% 到 -76.4%,但 R 与 O3 剂量之间存在显著的负相关。与潮湿或凉爽的年份相比,大豆栽培品种在更干燥或更炎热的条件下生长时,[O3]升高造成的种子产量损失更大,因为更炎热和更干燥的条件与更大的 O3 处理量有关。然而,天气条件的年际变化并不影响大豆种子产量对特定 [O3] 增加的敏感性。总之,这项研究从数量上证明,虽然干旱或气温升高会导致更高的 O3 处理浓度和 O3 诱导的种子减产,但干旱和气温胁迫并不会改变大豆对 O3 的敏感性。我们的研究结果对模拟 O3 污染上升对作物的影响具有重要意义,并表明改变灌溉方法以减轻 O3 胁迫可能无法有效降低作物对 O3 的敏感性。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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