Range-wide responses to an extreme heat event in <em>Mimulus cardinalis</em>

Premise Extreme events are an understudied aspect of ongoing anthropogenic climate change that could play a disproportionate role in the threat that rapid environmental shifts pose to natural populations. Methods We used a short-term heatwave treatment in controlled growth chamber environments to study evolutionary responses in Mimulus cardinalis populations to a recent repeated extreme heat event. Individuals from before (ancestors) and after (descendants) this extreme heat event were resurrected from seeds harvested from six populations across the range of M. cardinalis, and their physiological, performance, and functional responses (stomatal conductance, leaf temperature difference, photosystem II efficiency, relative growth rate, specific leaf area, and leaf dry matter content) to the heatwave treatment were assessed. Key Results Our results allow for two main conclusions: 1) plants responded favorably to the heatwave treatment in terms of their overall performance and the magnitude..., , # Range-wide responses to an extreme heat event in Mimulus cardinalis Readme file associated with the paper Albano et al., accepted in American Journal of Botany (October 20, 2025) In this paper, we perform a resurrection experiment, exposing Mimulus cardinalis to a heatwave treatment in growth chamber environments. M. cardinalis individuals were sourced from six populations across its range (two leading-edge, two range-center, two trailing-edge) and within each population, seeds were harvested in 2010 (ancestors) and 2017 (descendants) which were time periods selected before and after a natural repeated heatwave event in western North America. This design allows for investigation of physiological, performance, and functional trait responses to the heatwave treatment for each population, along with investigation of evolutionary responses to the natural heatwave event that could affect how plants response to heatwave treatment. This experiment addressed two main objectives: (1) quantif...,研究背景：极端事件是当前人为气候变化领域尚未被充分研究的内容，其在快速环境变化对自然种群构成的威胁中可能发挥不成比例的关键作用。 研究方法：我们在可控生长箱（growth chamber）环境中设置短期热浪处理，以探究红花沟酸浆（Mimulus cardinalis）种群对近期频发极端高温事件的进化响应。本研究从红花沟酸浆全分布范围内的6个种群中收获种子，获取了极端高温事件发生前的祖先种群种子与发生后的后代种群种子，并对其在热浪处理下的生理、生长表现及功能响应指标进行了评估，具体指标包括气孔导度、叶温差、光系统II（photosystem II）效率、相对生长率、比叶面积以及叶干物质含量。 核心研究结果：本研究结果可归纳为两项主要结论：1）从整体生长表现及响应幅度来看，植物对热浪处理呈现出正向响应；…… # 红花沟酸浆（Mimulus cardinalis）全分布区极端高温事件响应研究 本数据集关联Albano等人于2025年10月20日被《美国植物学杂志》（American Journal of Botany）接收的研究论文。本研究开展复活实验，在生长箱（growth chamber）环境中对红花沟酸浆（Mimulus cardinalis）施加热浪处理。实验所用红花沟酸浆个体采自其分布范围内的6个种群，其中包括2个分布前缘种群、2个分布中心种群与2个分布后缘种群；每个种群的种子分别于2010年（对应祖先种群）和2017年（对应后代种群）收获，这两个时间节点选自北美西部自然频发热浪事件发生的前后时期。该实验设计可用于探究不同种群对热浪处理的生理、生长表现及功能性状响应，同时可解析自然极端高温事件引发的进化响应——这类进化响应可能会影响植物对后续热浪处理的应答效果。本实验旨在达成两项核心目标：(1) 量化……