Residue P132 of PsbS plays an important role in regulating the dynamics of non-photochemical quenching in Arabidopsis.

ABSTRACT: Increasing the dynamics of non-photochemical quenching (NPQ) under changing light levels represents a promising strategy for improving photosynthetic light-use efficiency for greater crop yields. PsbS plays a crucial role in modulating both the capacity and dynamics of NPQ. Nevertheless, the specific mechanisms by which PsbS mediates functional state transitions and the detailed molecular interactions involved in NPQ are still not fully understood. In this study, we identified an amino acid residue, P132, in Arabidopsis thaliana PsbS (AtPsbS) whose substitution with alanine (P132A) causes rapid NPQ induction under low light and significantly reduces the rate of NPQ relaxation in the dark. Our findings suggest that the AtPsbS_P132A mutation keeps PsbS in a loose dimer state that i

SUBMITTER: Mao L 

PROVIDER: S-EPMC12902276 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature