When exposed to neighbour cues, competitive plants increase stem growth to reduce the degree of current or future shade. The aim of this work is to investigate the impact of weather conditions on the magnitude of shade avoidance responses in Arabidopsis thaliana . We first generated a growth rate database under controlled conditions and elaborated a model that predicts daytime hypocotyl growth as a function of the activity of the main photosensory receptors (phytochromes A and B, cryptochromes 1 and 2) in combination with light and temperature inputs. We then incorporated the action of thermal amplitude to account for its effect on selected genotypes, which correlates with the dynamics of the growth‐promoting transcription factor PHYTOCHROME‐INTERACTING FACTOR 4. The model predicted growth rate in the field with reasonable accuracy. Thus, we used the model in combination with a worldwide data set of current and future whether conditions. The analysis predicted enhanced shade avoidance responses as a result of higher temperatures due to the geographical location or global warming. Irradiance and thermal amplitude had no effects. These trends were also observed for our local growth rate measurements. We conclude that, if water and nutrients do not become limiting, warm environments enhance the shade avoidance response.

中文翻译：

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避光响应在温暖的环境中变得更具攻击性。

当暴露于邻近线索时，竞争植物会增加茎的生长，从而降低当前或将来的阴影程度。这项工作的目的是调查天气条件对拟南芥避光反应强度的影响。。我们首先在受控条件下生成了一个生长速率数据库，并建立了一个模型，该模型可预测白天下胚轴的生长与主要光敏受体（植物色素A和B，隐色色素1和2）以及光和温度输入的关系。然后，我们结合了热振幅的作用，以考虑其对选定基因型的影响，这与促进生长的转录因子PHYTOCHROME-INTERACTING FACTOR 4的动力学相关。该模型以合理的准确性预测了该领域的增长率。因此，我们将模型与当前和未来状况的全球数据集结合使用。该分析预测由于地理位置或全球变暖导致的较高温度导致避光响应增强。辐照度和热振幅没有影响。在我们当地的增长率测量中也观察到了这些趋势。我们得出的结论是，如果水和养分没有受到限制，温暖的环境会增强避光响应。