Recent advances in the understanding of superoxide anion radical formation in the photosynthetic electron transport chain

Impact of growth light environment on oxygen sensitivity in rice: Pseudo‐first‐order response of photosystem I photoinhibition to O2 partial pressure

“…By assigning the initial concentration of [PSI active0 ] as a relative value, we found that the time‐course change in [PSI active ] replicates the kinetics of the relative decrease in Y ( I ) during the rSP treatment (Figure 4). These observations suggest that the degree of PSI photoinhibition can be attributed to comparable kinetics of O 2 reduction, consistent with the findings of a previous study (Kozuleva, 2022; Kozuleva et al, 2021). Considering the similarity in O 2 ‐dependent kinetics between A 1 ‐dependent O 2 reduction and the progression of PSI photoinhibition observed here, it is likely that the generation of ROS causing PSI photoinhibition occurs within the thylakoid membranes, as suggested by in vitro experiments (Takagi et al, 2016).…”

“…Recently, the inner membrane component A 1 within PSI has been identified as a principal ROS production site under high-light conditions (Kozuleva et al, 2014(Kozuleva et al, , 2021. Kozuleva (2022) suggested that the O 2 reduction rate could be described as a second-order reaction involving PSI concentration and O 2 partial pressure. When PSI photoinhibition follows the second-order reaction kinetics, the rate of PSI photoinhibition can be expressed as…”

“…In fact, Lien and San Pietro (1979) observed the non-saturation kinetics of the O 2 reduction rate in response to changes in the O 2 partial pressure under the saturating photon flux density of white light. In contrast, Kozuleva (2022) proposed that the O 2 reduction reaction can be described as a second-order reaction. In this scenario, ROS production depends on the partial pressure of O 2 near the O 2 reduction sites in chloroplasts.…”

Protective role of quercetin and kaempferol against oxidative damage and photosynthesis inhibition in wheat chloroplasts under arsenic stress

“…The PSI and PSII reactions are also affected by raising the level of cellular As ions, resulting in a decrease in photochemical efficiency. Especially, damage to the water oxidizing complex in the thylakoid lumen, as well as the inclusion of metal ions in electron transport in ETC, both impair quantum efficiency and promote ROS generation, resulting in oxidative stress (Kozuleva, 2022;Singh et al, 2015). The decrease in and is maintained by turnover of the D1 and D2 proteins (Kumazaki & Suzuki, 2019).…”

“…With the rapid degradation of proteins in the reaction center of Photosystem I (PSI) and Photosystem II (PSII), photosynthesis is harmed at many stages (Ali et al, 2022; Bianucci et al, 2020; Sarath et al, 2022). Oxidative stress aggravates by the formation of H 2 O 2 from electrons exiting the photosynthetic electron transport system (Kozuleva, 2022). According to numerous research, As stress causes significant biomass loss in Triticum aestivum (Ali & Perveen, 2020), Glycine max (Faizan et al, 2022), Zea mays (Ghosh et al, 2016), and other grains (Bianucci et al, 2020).…”