The adaptability of soybean photosynthesis to midday high-light duration through CEF-NPQ coupling regulation.

ABSTRACT: Fluctuating light (FL) conditions particularly the diurnal alternation between shaded and high-light periods are intrinsic to intercropping systems and impose substantial regulatory challenges on crop photosynthesis. However, the cultivar-specific mechanisms underlying adaptation to such dynamic light environments remain largely unexplored. Here, we examined how the duration of midday high-light exposure modulates the coordination between cyclic electron flow (CEF) and non-photochemical quenching (NPQ) in two soybean cultivars grown under simulated intercropping light regimes. Plants were exposed to morning shade followed by either short (T30) or prolonged (T150, T200) midday high-light treatments. All treatments triggered common photoprotective responses, including increased energy dissip

SUBMITTER: Lei Y 

PROVIDER: S-EPMC12454400 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature