Metabolite profiling reveals slow and uncoordinated adjustment of C4 photosynthesis to sudden changes in irradiance.

ABSTRACT: In the field, plants continually experience changes in irradiance. Research in C3 species has revealed that while the Calvin-Benson cycle (CBC) adjusts rapidly to changing irradiance, there is substantial loss of photosynthetic efficiency due to slow adjustment of energy dissipation and stomatal conductance. Less is known about the impact of changing irradiance on photosynthetic efficiency in C4 species. We subjected maize (Zea mays) to a sudden increase or decrease of irradiance in the nonsaturating range and performed time-resolved measurement of photosynthetic rate and profiling of metabolites from the CBC, the CO2-concentrating mechanism (CCM), the energy shuttle, photorespiration, and end-product biosynthesis. After a decrease in irradiance, photosynthesis is transiently buffered by e

SUBMITTER: Arrivault S 

PROVIDER: S-EPMC12624396 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature