The role of photorespiration in preventing feedback regulation via ATP synthase in Nicotiana tabacum.

ABSTRACT: Photorespiration consumes substantial amounts of energy in the forms of adenosine triphosphate (ATP) and reductant making the pathway an important component in leaf energetics. Because of this high reductant demand, photorespiration is proposed to act as a photoprotective electron sink. However, photorespiration consumes more ATP relative to reductant than the C3 cycle meaning increased flux disproportionally increases ATP demand relative to reductant. Here we explore how energetic consumption from photorespiration impacts the flexibility of the light reactions in nicotiana tabacum. Specifically, we demonstrate that decreased photosynthetic efficiency (ϕ_II ) at low photorespiratory flux was related to feedback regulation at the chloroplast ATP synthase. Additionally, decreased ϕ

SUBMITTER: Smith K 

PROVIDER: S-EPMC10842328 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature