Generalised dose–response curves are essential to understand how plants acclimate to atmospheric CO₂. We carried out a meta-analysis of 630 experiments in which C₃ plants were experimentally grown at different [CO₂] under relatively benign conditions, and derived dose–response curves for 85 phenotypic traits. These curves were characterised by form, plasticity, consistency and reliability. Considered over a range of 200–1200 µmol mol⁻¹ CO₂, some traits more than doubled (e.g. area-based photosynthesis; intrinsic water-use efficiency), whereas others more than halved (area-based transpiration). At current atmospheric [CO₂], 64% of the total stimulation in biomass over the 200–1200 µmol mol⁻¹ range has already been realised. We also mapped the trait responses of plants to [CO₂] against those we have quantified before for light intensity. For most traits, CO₂ and light responses were of similar direction. However, some traits (such as reproductive effort) only responded to light, others (such as plant height) only to [CO₂], and some traits (such as area-based transpiration) responded in opposite directions. This synthesis provides a comprehensive picture of plant responses to [CO₂] at different integration levels and offers the quantitative dose–response curves that can be used to improve global change simulation models.

中文翻译：

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C3 植物对大气 CO2 响应的荟萃分析：从分子水平到整株水平的 85 个性状的剂量反应曲线

广义剂量反应曲线对于了解植物如何适应大气 CO ₂至关重要。我们对 630 个实验进行了荟萃分析，其中 C _{3植物在相对温和的条件下在不同的 [CO 2} ] 条件下进行实验生长，并得出了 85 个表型性状的剂量-反应曲线。这些曲线的特点是形式、可塑性、一致性和可靠性。考虑到 200–1200 µmol mol ^-1 CO ₂的范围，一些性状增加了一倍以上（例如基于面积的光合作用；内在的水分利用效率），而其他性状则减少了一半以上（基于面积的蒸腾）。在当前大气 [CO ₂]，已经实现了 200-1200 µmol mol ^-1范围内64% 的生物质总刺激。我们还将植物对 [CO ₂ ] 的性状响应与我们之前对光强度进行量化的响应进行对比。对于大多数性状，CO ₂和光响应具有相似的方向。然而，一些性状（如繁殖力）只对光有反应，另一些性状（如株高）只对[CO ₂ ]有反应，而一些性状（如基于面积的蒸腾）则相反。这种综合提供了植物在不同整合水平下对 [CO ₂ ] 响应的综合图像，并提供了可用于改进全球变化模拟模型的定量剂量-反应曲线。