Growth Temperature Alters the Thermal Sensitivity of Mesophyll Conductance in Wild and Cultivated Tomato.

Growth temperature acclimates mesophyll conductance thermal sensitivity in both wild Solanum pennellii and cultivated Solanum lycopersicum cv. M82, shifting g m Q10 from 0.92 to 1.29 (M82) and 1.03 to 1.44 (pennellii).

• Why it matters: If g m temperature responses are not fixed, predicting photosynthesis under changing climates requires knowing whether leaves adjust g m sensitivity to their growth conditions.
• What they did: Plants were grown under four day/night regimes (16°C/10°C to 34°C/28°C), and combined gas exchange with chlorophyll fluorescence quantified net photosynthesis (A n ), g m, and photorespiration (R l ).
• The result: Warm growth increased g m activation energy from near zero to 19.6 and 27.8 kJ mol -1, shifted g m thermal optima, while R l stayed temperature sensitive with limited acclimation.

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