Salt stress inhibits photosystems II and I in cyanobacteria
Salt stress inhibits photosystems II and I in cyanobacteria
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DOI：
10.1007/s11120-008-9334-x
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发表时间：
2008-10-01
影响因子：
3.7
通讯作者：
Murata, Norio
中科院分区：
文献类型：
--
作者：
Allakhverdiev, Suleyman I.;Murata, Norio
最近对蓝细菌细胞对盐胁迫的反应的研究表明，NaCl诱导的光系统II和I的光合作用活性下降涉及快速和缓慢的变化。在几分钟之内发生的两个光系统活性的快速减少是可逆的，并且与渗透作用相关，这会诱导细胞质通过水通道中的水出口，并迅速增加盐的细胞内浓度。在几个小时内发生的活动减少较慢，是不可逆的，与离子效应有关，这是由于Na+和Cl-离子通过K+（Na+）通道的流入而引起的，可能是Cl-通道，导致外在蛋白质的解离来自光系统。结合光应力，盐应激通过抑制光损伤光系统II的修复来显着刺激光抑制。通过膜脂质中脂肪酸的不饱和度以及兼容溶质的细胞内合成，例如葡萄糖基甘油和甘油乙烯的脂肪酸的不饱和度，可以增强光化对盐应激的耐受性。在这篇综述中，我们总结了盐胁迫对蓝细菌光合作用的影响的最新进展。
Recent studies of responses of cyanobacterial cells to salt stress have revealed that the NaCl-induced decline in the photosynthetic activities of photosystems II and I involves rapid and slow changes. The rapid decreases in the activities of both photosystems, which occur within a few minutes, are reversible and are associated with osmotic effects, which induce the efflux of water from the cytosol through water channels and rapidly increase intracellular concentrations of salts. Slower decreases in activity, which occur within hours, are irreversible and are associated with ionic effects that are due to the influx of Na+ and Cl- ions through K+(Na+) channels and, probably, Cl- channels, with resultant dissociation of extrinsic proteins from photosystems. In combination with light stress, salt stress significantly stimulates photoinhibition by inhibiting repair of photodamaged photosystem II. Tolerance of photosystems to salt stress can be enhanced by genetically engineered increases in the unsaturation of fatty acids in membrane lipids and by intracellular synthesis of compatible solutes, such as glucosylglycerol and glycinebetaine. In this review, we summarize recent progress in research on the effects of salt stress on photosynthesis in cyanobacteria.