Flavodiiron-mediated O₂ photoreduction at photosystem I acceptor-side provides photoprotection to conifer thylakoids in early spring.

ABSTRACT: Green organisms evolve oxygen (O₂) via photosynthesis and consume it by respiration. Generally, net O₂ consumption only becomes dominant when photosynthesis is suppressed at night. Here, we show that green thylakoid membranes of Scots pine (Pinus sylvestris L) and Norway spruce (Picea abies) needles display strong O₂ consumption even in the presence of light when extremely low temperatures coincide with high solar irradiation during early spring (ES). By employing different electron transport chain inhibitors, we show that this unusual light-induced O₂ consumption occurs around photosystem (PS) I and correlates with higher abundance of flavodiiron (Flv) A protein in ES thylakoids. With P700 absorption changes, we demonstrate that electron scaveng

SUBMITTER: Bag P 

PROVIDER: S-EPMC10239515 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature