Salt tolerance of Microcoleus vaginatus Gom., a cyanobacterium isolated from desert algal crust, was enhanced by exogenous carbohydrates

Chen, Lanzhou; Li, Dunhai; Liu, Yongding

doi:10.1016/s0140-1963(02)00292-6

Cited by 58 publications

(51 citation statements)

References 28 publications

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“…Reddy et al [48] found that carbohydrates were the physical barrier for atmospheric oxygen which provides a protective effect on nitrogen fixation in cyanobacterium Cyanothece sp. The content of carbohydrates increased 67 % when cyanobacterium Microcoleus vaginatus exposed under salt stress [10]. Based on these reports, we speculate that increased total carbohydrate in this research may have protective effect in terms of anti-UVBR by increasing the weight of cells for settlement to escape the injury.…”

Section: Discussionsupporting

confidence: 59%

Enhanced Resistance to UV-B Radiation in Anabaena sp. PCC 7120 (Cyanophyceae) by Repeated Exposure

Qin

2014

Curr Microbiol

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In natural habitats, organisms especially phytoplankton are not always continuously subjected to ultraviolet-B radiation (UVBR). By simulation of the natural situation, the N 2 -fixing cyanobacterium Anabaena sp. PCC 7120 was subjected to UV-B exposure and recovery cycles. A series of morphological and physiological changes were observed in Anabaena sp. PCC 7120 under repeated UVBR when compared with controls. Such as the breakage of filaments, intervals between heterocysts, heterocyst frequency, total carbohydrate, and carotenoids were increased, while the nitrogenase activity and photosynthetic activity were inhibited by repeated UVBR; however, these activities could recover when UV-B stress was removed. Unexpectedly, the over-compensatory growth was observed at the end of the second round of exposure and recovery cycle. Our results showed that discontinuous UVBR could increase the growth rate and the tolerance as well as repair capacity of Anabaena sp. PCC 7120. These results indicate that moderate UVBR may increase the growth of cyanobacteria in natural habitats.

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Section: Discussionsupporting

confidence: 59%

Enhanced Resistance to UV-B Radiation in Anabaena sp. PCC 7120 (Cyanophyceae) by Repeated Exposure

Qin

2014

Curr Microbiol

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“…Some works have reported that EPS of microalgae might be absorbed and used as a carbon source for heterotrophic metabolism in surviving prolonged detrimental stress [5]. The addition of EPS might be absorbed as carbon source to join into carbohydrate metabolism, and to change the synthesis of reducing sugar and sucrose, and even to enhance the function of scavenging ROS to protect cells from oxidative damage [7].…”

Section: Discussionmentioning

confidence: 99%

“…Cellular total carbohydrates and reducing sugar were prepared according to method of Chen et al [5], and quantified according to the phenol-sulphuric acid method of Dubios et al [12], using glucose as standard. The EPS was quantified according to the methods of Huang et al [17], and normalized to dry weight.…”

Section: Carbohydrate Analysismentioning

confidence: 99%

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The response of carbohydrate metabolism to the fluctuation of relative humidity (RH) in the desert soil cyanobacterium Phormidium tenue

Chen

Yang

Deng

et al. 2012

European Journal of Soil Biology

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“…Biomass measured as dry cell weight. The polysaccharides content released into the culture medium (RPS), in the supernatant, was determined according to the procedure of Chen et al (2003). The polysaccharides formed capsular or slimy layer (CPS) were prepared using the method of Su et al (2008).…”

mentioning

confidence: 99%

Effects of light intensity on components and topographical structures of extracellular polysaccharides from the cyanobacteria Nostoc sp.

Xia

Zhou

et al. 2014

J Microbiol.

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A study on the effects of light intensity (40 and 80 μE/m 2 /sec) on the components and topographical structures of extracellular polysaccharides (EPS) was carried out in cyanobacteria Nostoc sp.. EPS yield increased with light intensity. However, light intensity did not significantly affect the EPS fractions and monosaccharide composition. Higher light intensity generally resulted in higher protein content of EPS in similar fractions. The topographical structure of EPS, investigated by atomic force microscopy, appeared as spherical lumps, chains and networks. The long chains were observed at higher light intensity. Thus, light intensity affected the yield and nature of EPS.

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Salt tolerance of Microcoleus vaginatus Gom., a cyanobacterium isolated from desert algal crust, was enhanced by exogenous carbohydrates

Cited by 58 publications

References 28 publications

Enhanced Resistance to UV-B Radiation in Anabaena sp. PCC 7120 (Cyanophyceae) by Repeated Exposure

Enhanced Resistance to UV-B Radiation in Anabaena sp. PCC 7120 (Cyanophyceae) by Repeated Exposure

The response of carbohydrate metabolism to the fluctuation of relative humidity (RH) in the desert soil cyanobacterium Phormidium tenue

Effects of light intensity on components and topographical structures of extracellular polysaccharides from the cyanobacteria Nostoc sp.

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