Fig. 7
A model was proposed for physiological mechanism of the effect of small papillae on photosynthetic performance. The absence of SP in the spd25 mutant affected silicon and epidermal wax deposition, thereby accelerating water loss in leaves, which lead to stomatal closure and reduced gas exchange parameters. The inhibited carbon assimilation reaction of photosynthesis in the spd25 mutant feedback affected the primary reaction of photosynthesis. The optical properties of small papillae dissipate excess energy by up-regulating ΦNPQ and ΦNO.