Acclimation Unifies the Scaling of Carbon Assimilation Across Climate Gradients and Levels of Organisation

IF 7.6 1区 环境科学与生态学 Q1 ECOLOGY
Ecology Letters Pub Date : 2024-10-29 DOI:10.1111/ele.70004
Josef C. Garen, Sean T. Michaletz
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引用次数: 0

Abstract

The temperature dependence of carbon assimilation—from leaf photosynthesis to ecosystem productivity—is hypothesised to be driven by the kinetics of Rubisco-catalysed carboxylation and electron transport. However, photosynthetic physiology acclimates to changes in temperature, which may decouple temperature dependencies at higher levels of organisation from the acute temperature sensitivity of photosynthesis. Here, we integrate relative growth rate theory, metabolic theory and biochemical photosynthesis theory to develop a carbon budget model of plant growth that accounts for photosynthetic acclimation to temperature. We test its predictions using a novel experimental approach enabling concurrent measurement of the temperature sensitivity of acute photosynthesis, acclimated photosynthesis and growth rate. We demonstrate for the first time that photosynthetic acclimation mediates how carbon assimilation kinetics ‘scale up’ from leaf photosynthesis to whole-plant growth. We also find that existing models of photosynthetic acclimation are unable to predict features of growth rate responses to temperature in our system.

Abstract Image

适应统一了不同气候梯度和组织水平的碳同化规模
碳同化--从叶片光合作用到生态系统生产力--的温度依赖性假设是由 Rubisco 催化的羧化和电子传输动力学驱动的。然而,光合作用生理学会适应温度的变化,这可能会使更高层次的组织对温度的依赖性与光合作用对温度的高度敏感性脱钩。在这里,我们综合了相对生长速率理论、新陈代谢理论和生化光合作用理论,建立了一个植物生长的碳预算模型,该模型考虑了光合作用对温度的适应性。我们采用新颖的实验方法,同时测量急性光合作用、适应性光合作用和生长速率对温度的敏感性,从而检验了该模型的预测结果。我们首次证明,光合作用适应性介导了碳同化动力学如何从叶片光合作用 "放大 "到整个植物生长。我们还发现,在我们的系统中,现有的光合适应模型无法预测生长速率对温度的反应特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ecology Letters
Ecology Letters 环境科学-生态学
CiteScore
17.60
自引率
3.40%
发文量
201
审稿时长
1.8 months
期刊介绍: Ecology Letters serves as a platform for the rapid publication of innovative research in ecology. It considers manuscripts across all taxa, biomes, and geographic regions, prioritizing papers that investigate clearly stated hypotheses. The journal publishes concise papers of high originality and general interest, contributing to new developments in ecology. Purely descriptive papers and those that only confirm or extend previous results are discouraged.
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