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Mitochondrial alternative oxidase pathway protects plants against photoinhibition by alleviating inhibition of the repair of photodamaged PSII through preventing formation of reactive oxygen species in Rumex K-1 leaves. | LitMetric

AI Article Synopsis

  • - The study investigates how the alternative oxidase (AOX) pathway in Rumex K-1 leaves helps reduce photoinhibition, which occurs during excessive light exposure! - Inhibiting the AOX pathway leads to decreased activity of NADP-malate dehydrogenase and electron acceptors, causing an over-reduction of the photosystem I (PSI) and disrupting electron transport from photosystem II (PSII), increasing reactive oxygen species (ROS) levels! - While the AOX pathway helps prevent photoinhibition by reducing ROS accumulation and protecting PSII repair, inhibiting it did not worsen photodamage under conditions where a chloroplast protein synthesis inhibitor was present!

Article Abstract

The purpose of this study was to explore how the mitochondrial AOX (alternative oxidase) pathway alleviates photoinhibition in Rumex K-1 leaves. Inhibition of the AOX pathway decreased the initial activity of NADP-malate dehydrogenase (EC 1.1.1.82, NADP-MDH) and the pool size of photosynthetic end electron acceptors, resulting in an over-reduction of the photosystem I (PSI) acceptor side. The over-reduction of the PSI acceptor side further inhibited electron transport from the photosystem II (PSII) reaction centers to the PSII acceptor side as indicated by an increase in V(J) (the relative variable fluorescence at J-step), causing an imbalance between photosynthetic light absorption and energy utilization per active reaction center (RC) under high light, which led to the over-excitation of the PSII reaction centers. The over-reduction of the PSI acceptor side and the over-excitation of the PSII reaction centers enhanced the accumulation of reactive oxygen species (ROS), which inhibited the repair of the photodamaged PSII. However, the inhibition of the AOX pathway did not change the level of photoinhibition under high light in the presence of the chloroplast D1 protein synthesis inhibitor chloramphenicol, indicating that the inhibition of the AOX pathway did not accelerate the photodamage to PSII directly. All these results suggest that the AOX pathway plays an important role in the protection of plants against photoinhibition by minimizing the inhibition of the repair of the photodamaged PSII through preventing the over-production of ROS.

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Source
http://dx.doi.org/10.1111/j.1399-3054.2011.01514.xDOI Listing

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