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Effect of Hypoxia on Photosystem II of Tropical Seagrass Enhalus acoroides in the Dark
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-09-21 , DOI: 10.1111/php.13522 Xingkai Che 1 , Tie Zhang 1, 2 , Hu Li 1 , Litao Zhang 1, 3 , Jianguo Liu 1, 3
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-09-21 , DOI: 10.1111/php.13522 Xingkai Che 1 , Tie Zhang 1, 2 , Hu Li 1 , Litao Zhang 1, 3 , Jianguo Liu 1, 3
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Hypoxia induced by eutrophication has become an important factor threatening the survival of coastal life such as Enhalus acoroides. The purpose of the current study was to explore the effect of hypoxia on photosystem II (PSII) of E. acoroides in the dark. The results showed that long-term dark hypoxia damages PSII activity of E. acoroides. The lower the oxygen content and the longer the hypoxic duration, the more seriously PSII was damaged and the less light-independent recovery parts of the damaged PSII. The damage to PSII caused by hypoxia was unrelated to ROS but related to respiration, because the respiration rate decreased with the decrease of oxygen content and PSII activity decreased significantly even at a normal oxygen content after the inhibition of aerobic respiratory pathway. Hypoxia reduced energy fluxes between the antennas and the RCs, and generated many inactive RCs, which significantly reduced the electron transfer efficiency of PSII. Severe hypoxia (2.65 mg L−1 oxygen content) caused chlorophyll degradation. The study demonstrated that hypoxia damages PSII of E. acoroides and inhibits PSII recovery in the dark. We suggested that hypoxia together with other environment stressors would be the key reason for the decline of E. acoroides meadows.
中文翻译：
黑暗中缺氧对热带海草 Enhalus acoroides 光系统 II 的影响
富营养化引起的缺氧已成为威胁海藻等沿海生物生存的重要因素。本研究的目的是探讨缺氧对大肠杆菌光系统 II (PSII) 的影响。黑暗中的珊瑚虫。结果表明，长期暗缺氧会损害大肠杆菌的PSII活性。蛞蝓. 氧含量越低，缺氧时间越长，PSII受损越严重，受损PSII的光独立恢复部位越少。缺氧对PSII的损害与ROS无关，但与呼吸有关，因为呼吸速率随着氧含量的降低而降低，即使在氧含量正常的情况下，抑制有氧呼吸通路后，PSII活性也显着降低。缺氧减少了天线和RCs之间的能量通量，并产生了许多不活跃的RCs，这显着降低了PSII的电子传递效率。严重缺氧（2.65 mg L -1氧含量）导致叶绿素降解。研究表明，缺氧会损害大肠杆菌的PSII。蛞蝓并抑制 PSII 在黑暗中的恢复。我们认为缺氧和其他环境压力因素将是E. acoroides草甸下降的关键原因。
更新日期：2021-09-21
中文翻译：
黑暗中缺氧对热带海草 Enhalus acoroides 光系统 II 的影响
富营养化引起的缺氧已成为威胁海藻等沿海生物生存的重要因素。本研究的目的是探讨缺氧对大肠杆菌光系统 II (PSII) 的影响。黑暗中的珊瑚虫。结果表明，长期暗缺氧会损害大肠杆菌的PSII活性。蛞蝓. 氧含量越低，缺氧时间越长，PSII受损越严重，受损PSII的光独立恢复部位越少。缺氧对PSII的损害与ROS无关，但与呼吸有关，因为呼吸速率随着氧含量的降低而降低，即使在氧含量正常的情况下，抑制有氧呼吸通路后，PSII活性也显着降低。缺氧减少了天线和RCs之间的能量通量，并产生了许多不活跃的RCs，这显着降低了PSII的电子传递效率。严重缺氧（2.65 mg L -1氧含量）导致叶绿素降解。研究表明，缺氧会损害大肠杆菌的PSII。蛞蝓并抑制 PSII 在黑暗中的恢复。我们认为缺氧和其他环境压力因素将是E. acoroides草甸下降的关键原因。
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