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New insights into the effect of NdhO levels on cyanobacterial cell death triggered by high temperature
Functional Plant Biology ( IF 3 ) Pub Date : 2021-08-25 , DOI: 10.1071/fp21097
Jiaohong Zhao , Yuanyuan Jiang , Yuhao Tian , Jun Mao , Lanzhen Wei , Weimin Ma

NdhO, a regulatory oxygenic photosynthesis-specific subunit, is close to the ferredoxin-binding site of cyanobacterial NDH-1, and its levels are negatively associated with the rates of cyclic electron transfer around PSI mediated by NDH-1 (NDH-CET). However, the effect of NdhO levels on cyanobacterial cell death triggered by high temperature remains elusive. Here, our results uncovered a synergistic effect of NdhO levels on the cell death and reactive oxygen species (ROS) accumulation when cyanobacterial cells grown at 30°C for 1 day were transferred to 45°C for 2 days. Such synergistic effect was found to be closely associated with the activities of NDH-CET and CO2 assimilation during high temperature. Collectively, we propose that the effect of NdhO levels on the cyanobacterial cell bleaching and cell death triggered by high temperature is a result of influencing production of ROS by NDH-CET, which is considered to be vital to balance the ATP/NADPH ratio and improve the Calvin-Benson cycle.



中文翻译:

关于 NdhO 水平对高温引发的蓝藻细胞死亡影响的新见解

NdhO 是一种调节性含氧光合作用特异性亚基,靠近蓝藻 NDH-1 的铁氧还蛋白结合位点,其水平与 NDH-1 (NDH-CET) 介导的 PSI 周围的循环电子转移速率呈负相关。然而,NdhO 水平对高温引发的蓝藻细胞死亡的影响仍然难以捉摸。在这里,我们的结果揭示了当将在 30°C 下生长 1 天的蓝藻细胞转移到 45°C 下 2 天时,NdhO 水平对细胞死亡和活性氧 (ROS) 积累的协同作用。发现这种协同效应与 NDH-CET 和 CO 2的活性密切相关在高温下同化。总的来说,我们提出 NdhO 水平对高温引发的蓝藻细胞漂白和细胞死亡的影响是影响 NDH-CET 产生 ROS 的结果,这被认为对于平衡 ATP/NADPH 比率和改善卡尔文-本森循环。

更新日期:2021-08-27
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