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固氮蓝藻对盐度和渗透胁迫的差异响应。

Differential responses of nitrogen-fixing cyanobacteria to salinity and osmotic stresses.

机构信息

Molecular Biology and Agriculture Division, Bhabha Atomic Research Centre, Trombay, Bombay 400 085, India.

出版信息

Appl Environ Microbiol. 1993 Mar;59(3):899-904. doi: 10.1128/aem.59.3.899-904.1993.

Abstract

Two nitrogen-fixing Anabaena strains were found to be differentially tolerant to salinity and osmotic stresses. Anabaena torulosa, a brackish-water, salt-tolerant strain, was relatively osmosensitive. Anabaena sp. strain L-31, a freshwater, salt-sensitive strain, on the other hand, displayed significant osmotolerance. Salinity and osmotic stresses affected nitrogenase activity differently. Nitrogen fixation in both of the strains was severely inhibited by the ionic, but not by the osmotic, component of salinity stress. Such differential sensitivity of diazotrophy to salinity-osmotic stresses was observed irrespective of the inherent tolerance of the two strains to salt-osmotic stress. Exogenously added ammonium conferred significant protection against salinity stress but was ineffective against osmotic stress. Salinity and osmotic stresses also affected stress-induced gene expression differently. Synthesis of several proteins was repressed by salinity stress but not by equivalent or higher osmotic stress. Salinity and osmotic stresses induced many common proteins. In addition, unique salt stress- or osmotic stress-specific proteins were also induced in both strains, indicating differential regulation of protein synthesis by the two stresses. These data show that cyanobacterial sensitivity and responses to salinity and osmotic stresses are distinct, independent phenomena.

摘要

两种固氮蓝藻菌株被发现对盐度和渗透压胁迫具有不同的耐受性。一种耐盐的咸水蓝藻——鱼腥藻(Anabaena torulosa)相对较敏感于渗透压。另一方面,一种淡水、盐敏感的蓝藻——L-31 株,表现出显著的耐渗透压能力。盐度和渗透压胁迫对固氮酶活性的影响不同。两种菌株的固氮作用均受到盐度胁迫中离子成分的严重抑制,但不受渗透压成分的抑制。这种固氮作用对盐度-渗透压胁迫的敏感性差异,与两种菌株对盐-渗透压胁迫的固有耐受性无关。外加铵显著减轻了盐度胁迫的影响,但对渗透压胁迫无效。盐度和渗透压胁迫对胁迫诱导基因表达的影响也不同。几种蛋白质的合成受到盐度胁迫的抑制,但不受等效或更高渗透压胁迫的抑制。盐度胁迫和渗透压胁迫均诱导了许多共同的蛋白质。此外,两种菌株中还诱导了独特的盐胁迫或渗透压胁迫特异性蛋白质,表明两种胁迫对蛋白质合成的调控存在差异。这些数据表明,蓝藻对盐度和渗透压胁迫的敏感性和响应是不同的、独立的现象。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddf/202205/3ff01cab1150/aem00032-0256-a.jpg

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