Plants grow in a variable environment. While the effects of various environmental factors such as CO2 concentration, temperature, air humidity, and blue light on steady-state photosynthesis have been well documented, there has been less focus on the effects of these factors on photosynthesis in fluctuating light.
Kaiser et al. reveal that these factors influence photosynthetic induction and its underlying processes in dark-adapted tomato leaves. Photosynthetic induction rates (PIR) increased in high CO2 concentration and decreased in low air humidity, while leaf temperature caused a slight raise and blue light had no impact on PIR.