Department of Energy; Plant Research Laboratory; Michigan State University; East Lansing, MI USA.
Plant Signal Behav. 2013 Jul;8(7):e24713. doi: 10.4161/psb.24713. Epub 2013 May 6.
Salt impairs cellular morphology and photosynthetic pigment accumulation in the cyanobacterium Fremyella diplosiphon. Recent findings indicated that the impact of salt on cellular morphology was attributable to salt-associated effects on osmotic regulation, as the impact on morphology was reversible when cells were treated with an osmoticum in the presence of salt. The impact of salt on photosynthetic pigment accumulation was associated with ionic effects of salt on the cells, as pigment levels remained low when salt-treated cells were incubated together with an osmoticum or an antioxidant, the latter to mitigate the impact of a salt-associated accumulation of reactive oxygen species. Here, we provide evidence that the transcripts for genes encoding the phycobiliproteins are not reduced in the presence of salt. These results suggest that the negative impact of salt-mediated changes on pigment accumulation occurs post-transcriptionally. A greater understanding of the mechanisms which impact growth of strains such as F. diplosiphon, which harbor pigments that allow low-light and shade-tolerated growth, may facilitate the development or adaptation of such strains as useful for remediation of salt-impacted soils or biofuel production.
盐会损害蓝藻 Fremyella diplosiphon 的细胞形态和光合色素积累。最近的研究结果表明,盐对细胞形态的影响归因于盐对渗透调节的影响,因为当细胞在盐存在的情况下用渗透剂处理时,形态的影响是可逆的。盐对光合色素积累的影响与盐对细胞的离子效应有关,因为当用渗透剂或抗氧化剂孵育盐处理的细胞时,色素水平仍然很低,后者可以减轻与盐相关的活性氧积累的影响。在这里,我们提供的证据表明,在盐存在的情况下,编码藻胆蛋白的基因的转录本并没有减少。这些结果表明,盐介导的变化对色素积累的负面影响发生在转录后。更深入地了解影响类似 Fremyella diplosiphon 等菌株生长的机制,这些菌株含有允许低光和耐荫生长的色素,可能有助于开发或适应这些菌株,以用于修复受盐影响的土壤或生产生物燃料。