Ascorbic Acid Alleviates Damage from Heat Stress in the Photosystem II of Tall Fescue in Both the Photochemical and Thermal Phases.
Ascorbic Acid Alleviates Damage from Heat Stress in the Photosystem II of Tall Fescue in Both the Photochemical and Thermal Phases.
复制标题
抗坏血酸在光化学和热阶段减轻高羊茅光系统 II 中热应激的损害
DOI：
10.3389/fpls.2017.01373
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发表时间：
2017
影响因子：
5.6
通讯作者：
Fu J
中科院分区：
文献类型：
--
作者：
Chen K;Zhang M;Zhu H;Huang M;Zhu Q;Tang D;Han X;Li J;Sun J;Fu J
L-抗坏血酸（L-Ascorbate，Asc）在植物发育、激素信号、细胞周期和细胞氧化还原系统等方面具有重要作用，植物叶绿体中较高的Asc含量表明其在光系统中的重要作用。研究了高羊茅叶片中抗坏血酸（Asc）在高温胁迫下的作用。在热胁迫处理后，我们观察到初级光化学的最大量子产额（φPo）的较低值，这反映了光系统II（PSII）的光化学相的活性被抑制。此外，我们观察到较高的值的电子从QB到光系统I受体的转移效率（δ R 0），这反映了高羊茅的光系统的热相的活性提高。Asc的加入通过降低ROS含量以及向D1蛋白的酪氨酸残基提供电子的替代电子供体的含量来促进PSII的光化学相的行为。此外，外源Asc降低了光系统热相的活性，这可能有助于限制能量输入到高羊茅光系统对抗热胁迫。热胁迫处理后，Asc的合成增加。然而，在热胁迫下，这种调节并没有发生在转录水平，需要进一步研究。
L-Ascorbate (Asc) plays important roles in plant development, hormone signaling, the cell cycle and cellular redox system, etc. The higher content of Asc in plant chloroplasts indicates its important role in the photosystem. The objective of this study was to study the roles of Asc in tall fescue leaves against heat stress. After a heat stress treatment, we observed a lower value of the maximum quantum yield for primary photochemistry (φPo), which reflects the inhibited activity of the photochemical phase of photosystem II (PSII). Moreover, we observed a higher value of efficiency of electron transfer from QB to photosystem I acceptors (δR0), which reflects elevated activity of the thermal phase of the photosystem of the tall fescue. The addition of Asc facilitate the behavior of the photochemical phase of the PSII by lowering the ROS content as well as that of the alternative electron donor to provide electron to the tyrosine residue of the D1 protein. Additionally, exogenous Asc reduces the activity of the thermal phase of the photosystem, which could contribute to the limitation of energy input into the photosystem in tall fescue against heat stress. Synthesis of the Asc increased under heat stress treatment. However, under heat stress this regulation does not occur at the transcription level and requires further study.
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分析代表不同非生物应力，组织类型和发育阶段的高羊茅。
影响因子：
5.3
作者：
Mian, M. A. Rouf;Zhang, Yan;Wang, Zeng-Yu;Zhang, Ji-Yi;Cheng, Xiaofei;Chen, Lei;Chekhovskiy, Konstantin;Dai, Xinbin;Mao, Chunhong;Cheung, Foo;Zhao, Xuechun;He, Ji;Scott, Angela D.;Town, Christopher D.;May, Gregory D.
通讯作者：
May, Gregory D.
影响因子：
5.3
作者：
Mellidou I;Keulemans J;Kanellis AK;Davey MW
通讯作者：
Davey MW
影响因子：
2.7
作者：
Luo, Hongji;Li, Huiying;Fu, Jinmin
通讯作者：
Fu, Jinmin
影响因子：
3.7
作者：
Havaux, M
通讯作者：
Havaux, M
影响因子：
20.5
作者：
Linster, Carole L.;Clarke, Steven G.
通讯作者：
Clarke, Steven G.