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A river runs through it: intraspecific variability in hotter-drought-related physiological traits across the Mississippi divide in Pinus taeda L
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DOI：10.1093/treephys/tpag092.png)
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Abstract
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Human activities are intensifying heatwaves and droughts, threatening forest ecosystems worldwide. However, understanding intraspecific variation in physiological traits that confer resistance to hotter drought is critical for predicting tree responses to climate change. In Pinus taeda L., long-term geographic isolation across the Mississippi River Valley after the last glacial maximum has resulted in distinct population genetic structures, likely reflecting historical adaptation to contrasting climatic conditions in western and eastern refugia. However, it remains unclear whether contemporary populations retain meaningful variation in traits that confer tolerance to hotter and drier conditions, such as hydraulic vulnerability and water-use regulation, which are critical for predicting responses to future climate extremes.
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