Acclimation of carbon metabolism to a changing environment across a leaf rosette of Arabidopsis thaliana
2025
Vladimir Brodsky | Anian Kerscher | Michaela Urban | Thomas Nägele
Plants need to efficiently stabilize photosynthesis and carbon metabolism under changing environmental conditions to prevent irreversible tissue damage. For metabolic and biochemical analyses, leaves from different stages of Arabidopsis thaliana rosette development are frequently homogenized which might result in significant over- or underestimation of metabolite dynamics. In this study, photosynthesis and carbon metabolism were analyzed in mature and immature leaves of rosettes of natural Arabidopsis accessions originating from southern and northern Europe. The ambient growth condition at 22 °C was compared to a combined low temperature/elevated light treatment. Gradients of Fv/Fm and CO2 assimilation rates across the leaf rosettes hinted towards tissue-specific acclimation capacities of photosynthesis and carbon metabolism. The dynamics of carbohydrates and carboxylic acids were integrated with photosynthetic parameters in a quantitative carbon balance model. Model simulations suggested that mature leaf tissue stabilizes acclimation of carbon metabolism in immature leaf tissue and other sink tissue. In conclusion, acclimation capacities of photosynthesis to low temperatures and elevated light significantly differ between leaves of one rosette. This directly affects carbon metabolism which shapes the metabolic acclimation capacity of the whole plant. It is discussed to consider such tissue-specific effects to support physiological interpretation of experimental data on photosynthetic and metabolic acclimation.
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