Ozone pollution is a damaging air pollutant that reduces maize yields equivalently to nutrient deficiency, heat, and aridity stress. Therefore, understanding the physiological and biochemical responses of maize to ozone pollution and identifying traits predictive of ozone tolerance is important. In this study, we examined the physiological, biochemical and yield responses of six maize hybrids to elevated ozone in the field using Free Air Ozone Enrichment. Elevated ozone stress reduced photosynthetic capacity, in vivo and in vitro, decreasing Rubisco content, but not activation state. Contrary to our hypotheses, variation in maize hybrid responses to ozone was not associated with stomatal limitation or antioxidant pools in maize. Rather, tolerance to ozone stress in the hybrid B73 × Mo17 was correlated with maintenance of leaf N content. Sensitive lines showed greater ozone‐induced senescence and loss of photosynthetic capacity compared to the tolerant line.

中文翻译：

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耐臭氧玉米杂交种在田间长期暴露期间仍能保持 Rubisco 含量和活性。


臭氧污染是一种破坏性的空气污染物，它会降低玉米产量，相当于营养缺乏、高温和干旱胁迫。因此，了解玉米对臭氧污染的生理生化反应并确定预测臭氧耐受性的性状非常重要。在这项研究中，我们使用自由空气臭氧富集技术检查了六种玉米杂交品种对田间臭氧浓度升高的生理、生化和产量反应。臭氧胁迫升高会降低体内和体外的光合能力，降低 Rubisco 含量，但不会降低活化状态。与我们的假设相反，玉米杂种对臭氧反应的变化与玉米的气孔限制或抗氧化剂库无关。相反，杂种 B73 × Mo17 对臭氧胁迫的耐受性与叶片氮含量的维持相关。与耐受品系相比，敏感品系表现出更大的臭氧引起的衰老和光合能力丧失。