The response of the filamentous cyanobacterium Spirulina platensis to salt stress

1988 ◽  
Vol 150 (5) ◽  
pp. 417-420 ◽  
Author(s):  
Avigad Vonshak ◽  
Rachel Guy ◽  
Micha Guy
Keyword(s):  
Salt Stress ◽  
Spirulina Platensis ◽  
Filamentous Cyanobacterium

scholarly journals Salt stress enhancement of antioxidant and antiviral efficiency of Spirulina platensis

2010 ◽  
Vol 4 (24) ◽  
pp. 2622-2632 ◽  
Author(s):  
A Shalaby Emad ◽  
M M Shanab Sanaa ◽  
Singh Vikramjit
Keyword(s):  
Salt Stress ◽  
Spirulina Platensis

scholarly journals Changes in chlorophyll fluorescence parameters during desiccation and osmotic stress of Hassallia antarctica culture

2018 ◽  
Vol 8 (2) ◽  
pp. 198-207
Author(s):  
Marta Campos Alonso
Keyword(s):  
Salt Stress ◽  
Chlorophyll Fluorescence ◽  
Osmotic Stress ◽  
Austral Summer ◽  
Rapid Decline ◽  
Filamentous Cyanobacterium ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
Fluorescence Measurements ◽  
James Ross Island

Hassallia antarctica is a terrestrial cyanobacterium colonizing various habitats in Antarctica such as soil surface, microbiological mats and seepages. H. antarctica represents one of the cyanobacterial species forming biodiversity of terrestrial autotrophs of James Ross Island, Antarctica. It is a filamentous cyanobacterium composing blackish fasciculated clusters thanks to false branching. In our study, sensitivity of the species to dehydration and salt stress was studied. We used H. antarctica culture (CCALA 956) grown on Z liquid medium. Clusters of H. antarctica were placed on wet filter paper and dried naturally at 5°C. During gradual dehydration, relative water content (RWC) was evaluated gravimetrically simultaneously with chlorophyll fluorescence measurements. Slow Kautsky kinetics and the chlorophyll fluorescence parameters (FV/FM, ФPSII) were used to assess dehydration-related decrease in primary photosynthetic processes. It was found that H. antarctica, contrastingly to other terrestrial cyanobacteria from polar habitats, was not able to maintain photosynthetic processes at RWCs as low as 20%. Even during initial phase of dehydration (RWC of 95%) rapid decline in FV/FM occured. Resistance of H. antarctica to osmotic stress was studied by time courses of the chlorophyll fluorescence parameter in response to 3.0, 0.3, and 0.03 M NaCl solution. Both shape of slow Kautsky kinetics and numeric values of chlorophyll fluorescence parameters were affected by osmotic stress. While full inhibitory effect was apparent in 3.0 M NaCl treatment immediately, the salt stress-induced decline in chlorophyll fluorescence parameters was observed at 0.03 M NaCl even after 8 hours of exposition. It was, therefore, concluded that H. antarctica exhibited high resistance to osmotic stress which may help the species to cope with repetitive dehydration events that happen in the field during austral summer season in Antarctica, James Ross Island in particular.

scholarly journals Growth, Pigment and Protein Production of Spirulina platensis under different Ca(NO3)2 concentrations

2020 ◽  
Vol 9 (1) ◽  
pp. 38
Author(s):  
Muhammad Fakhri ◽  
Prive Widya Antika ◽  
Arning Wilujeng Ekawati ◽  
Nasrullah Bai Arifin
Keyword(s):  
Protein Content ◽  
Spirulina Platensis ◽  
Large Scale ◽  
Protein Production ◽  
Nitrate Concentration ◽  
Calcium Nitrate ◽  
Fish Feed ◽  
Filamentous Cyanobacterium ◽  
Significant Difference ◽  
Nitrate Concentrations

Spirulina platensis is a filamentous cyanobacterium that has been commerically used for fish feed and human food supplement. Low-cost production of Spirulina is needed when considering large-scale culture especially for industrial purposes. The aim of this study was to explain the effect of calcium nitrate (Ca(NO3)2) on growth, biomass, pigment, and protein production of S. platensis and to determine the best calcium nitrate concentration for Spirulina production.The microalgae was cultured at four calcium nitrate concentrations (1, 1.5, 2.0 and 2.5 g/L) with salinity of 15 ppt, constant light intensity of 4,000 lux and photoperiod of 24:0 light:dark cycles for 4 days. The results showed that different calcium nitrate concentrations remarkably affected the growth, biomass production, pigment and protein content of S. platensis (p<0.05). The highest specific growth rate of 0.721 day-1 and biomass concentration of 1.512 g/Lwere achieved at calcium nitrate concentration of 2.5 g/L. Moreover, the algae had the highest chlorophyll-a, carotenoid and protein content at 2.5 g L-1. Increasing calcium nitrate concentration from 1 to 2.5 g/L led to an increase in biomass, pigment and protein production of S. platensis. However, there was no significant difference between 2 and 2.5 g L-1 calcium nitrate concentrations. We suggest that 2-2.5 g/L Ca(NO3)2 concentration can be used profitably for S. platensis production.

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