Bunce J A
USDA-ARS, Adaptive Cropping Systems Laboratory, 20705 Beltsville, MD, USA.
Photosynthetica. 2024 Feb 6;62(1):112-115. doi: 10.32615/ps.2024.008. eCollection 2024.
In this study, 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 ( ) of mature leaves at high PPFD to intercellular CO concentrations ( ) were measured at 20, 25, and 30°C using a new method that generates a complete . curve in less than four minutes. Results indicated that photosynthesis measured at both values of 25 and 150 μmol mol 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 C species is substantially affected by night temperature.
在本研究中，将L.种植在室内可控环境箱中，白天温度均匀保持在30°C，夜间温度分别为30、25、20或15°C。使用一种新方法，该方法能在不到四分钟的时间内生成完整的 曲线，在20、25和30°C下测量了成熟叶片在高光量子通量密度（PPFD）下净光合作用（ ）对胞间CO₂浓度（ ）的响应。结果表明，在夜间温度为25和30°C条件下生长的植株中，当 值为25和150 μmol mol时测量的光合作用随测量温度显著增加，但在夜间温度为15或20°C条件下生长的植株中，光合作用随温度的变化要小得多。这些结果表明，该C₄物种光合作用对温度的适应性受到夜间温度的显著影响。
