Estimation of photosynthetic induction is significantly affected by inside and outside light intensity in Oryza genus

Abstract Nowadays, an increasing number of scientists have realized the important role of photosynthetic induction and stomatal kinetics in regulating plant growth ang water use efficiency under fluctuating light environments. However, measurements of photosynthetic rate and stomatal conductance ( g s ) during light induction are differs among studies. On the other hands, it is still under debate whether steady- and non-steady state g s are related to stomatal morphology. Here, we observed a strong effect of inside and outside light intensity of leaf chamber on photosynthetic induction. Lower light significantly decreased photosynthetic induction by altering stomatal and biochemical processes. It is meaningful to measuring photosynthetic induction on a whole plants irradiated environment in the future. Moreover, higher density of smaller stomata contributed to the response of stomatal opening and photosynthetic rate to fluctuating light, but had little effect on g s,steady under a constant light condition. Our findings may be beneficial to estimate rice photosynthetic efficiency under fluctuating light environments in the future.