Thermal acclimation of Pinus massoniana to warming depends on water conditions and climate of origin

作者：Cui Y, Mingkai Jiang, Ting Wu, Changchang Shao, Danielle A. Way, David T. Tissue, Honglang Duan · 发表于：The Plant Journal · 年份：2026 · DOI：10.1111/tpj.70695 · 被引用次数：1 · 研究领域：Plant Water Relations and Carbon Dynamics、Tree-ring climate responses、Plant responses to elevated CO2

SUMMARY Future climatic conditions are projected to become warmer and drier, critically challenging tree growth and survival. Understanding how photosynthesis and respiration of tree seedlings acclimate to warming is pivotal for predicting seedling responses to climate change and tree carbon dynamics. However, the photosynthetic capacity parameters of thermal acclimation remain unresolved; particularly their interaction with water availability constraints and local climate adaptation needs to be fully explored. Here, we grew seedlings of a widely planted timber species in subtropical China, Pinus massoniana , with two provenances from contrasting climates of origin (cooler‐drier and warmer‐wetter), under three growth temperatures (22°C, 26°C, and 30°C) and two water conditions (well‐watered and drought). Temperature responses of gas exchange and nutrient status were investigated, together with a data synthesis of meta‐analysis. The experimental results showed that under well‐watered conditions, the optimal temperature for photosynthesis ( T optA ), the net photosynthetic rate ( A 25 ) and dark respiration rate ( R 25 ) at 25°C, and respiratory sensitivity parameters ( Q 10 ) remained unexpectedly stable under warming for both provenances, contrasting with our hypotheses; however, data synthesis shows that the T optA from the cooler region increased with warming. Drought reduced T optA and A 25 , largely related to the magnitude of warming. Compared to drought‐only conditions,...