Photosynthetica 2024, 62(1):112-115 | DOI: 10.32615/ps.2024.008

Photosynthetic acclimation to temperature is affected by night temperature in Zea mays

J.A. BUNCE
USDA-ARS, Adaptive Cropping Systems Laboratory, 20705 Beltsville, MD, USA

In this study, Zea mays L. was grown in indoor controlled environment chambers with a uniform daytime temperature of 30°C, and night-time temperatures of 30, 25, 20, or 15°C. Responses of net photosynthesis (PN) of mature leaves at high PPFD to intercellular CO2 concentrations (Ci) were measured at 20, 25, and 30°C using a new method that generates a complete PN vs. Ci curve in less than four minutes. Results indicated that photosynthesis measured at both Ci values of 25 and 150 μmol mol-1 increased strongly with measurement temperature in plants grown with night temperatures of 25 and 30°C, but there was a much smaller change in photosynthesis with temperature in plants grown with night temperatures of 15 or 20°C. These results indicate that the acclimation of photosynthesis to temperature in this C4 species is substantially affected by night temperature.

Additional key words: C4 photosynthesis; CO2 response of photosynthesis; night temperature; temperature acclimation.

Received: October 10, 2023; Revised: January 2, 2024; Accepted: January 18, 2024; Prepublished online: February 6, 2024; Published: February 22, 2024  Show citation

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BUNCE, J.A. (2024). Photosynthetic acclimation to temperature is affected by night temperature in Zea mays. Photosynthetica, 62(1), 112-115. doi: 10.32615/ps.2024.008
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