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

Pushan Bag, Tatyana Shutova, Dmitry Shevela, Jenna Lihavainen, Sanchali Nanda, Alexander G. Ivanov, Johannes Messinger and Stefan Jansson ()
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Pushan Bag: Umeå University
Tatyana Shutova: Umeå University
Dmitry Shevela: Umeå University
Jenna Lihavainen: Umeå University
Sanchali Nanda: Umeå University
Alexander G. Ivanov: University of Western Ontario
Johannes Messinger: Umeå University
Stefan Jansson: Umeå University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: 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 scavenging from the acceptor-side of PSI via O2 photoreduction is a major alternative pathway in ES. This photoprotection mechanism in vascular plants indicates that conifers have developed an adaptative evolution trajectory for growing in harsh environments.

Date: 2023
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DOI: 10.1038/s41467-023-38938-z

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