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Ürek, Raziye Öztürk; Kerimoglu, Yusuf

doi:10.4194/1303-2712-v19_10_07

Turk. J. Fish. Aquat. Sci.

2019

DOI: 10.4194/1303-2712-v19_10_07

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Raziye Öztürk Ürek¹,

Yusuf Kerimoglu²

Abstract: The aim of this study was to investigate the effects of Mg 2+ (0 -4 mM), and Cu 2+ (0 -5 µM) concentrations on biomass and photosynthetic pigment-metabolites, and photosystem II activity in Arthrospira platensis Gomont 1892. The highest biomass was determined on control condition including both Mg 2+ (0.8 mM) and Cu 2+ (0.5 µM) as 49.1±1.6 mg mL -1 . Although the levels of phycocyanin, allophycocyanin and chlorophyll a were varied due to Mg 2+ concentration, phycocyanin and allophycocyanin were the major fract… Show more

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Cited by 3 publications

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Mg2+ limitation leads to a decrease in chlorophyll, resulting in an unbalanced photosynthetic apparatus in the cyanobacterium Synechocytis sp. PCC6803

Pohland,

Bernát,

Geimer

et al. 2024

Photosynth Res

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Mg2+, the most abundant divalent cation in living cells, plays a pivotal role in numerous enzymatic reactions and is of particular importance for organisms performing oxygenic photosynthesis. Its significance extends beyond serving as the central ion of the chlorophyll molecule, as it also acts as a counterion during the light reaction to balance the proton gradient across the thylakoid membranes. In this study, we investigated the effects of Mg2+ limitation on the physiology of the well-known model microorganism Synechocystis sp. PCC6803. Our findings reveal that Mg2+ deficiency triggers both morphological and functional changes. As seen in other oxygenic photosynthetic organisms, Mg2+ deficiency led to a decrease in cellular chlorophyll concentration. Moreover, the PSI-to-PSII ratio decreased, impacting the photosynthetic efficiency of the cell. In line with this, Mg2+ deficiency led to a change in the proton gradient built up across the thylakoid membrane upon illumination.

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Mg2+ limitation leads to a decrease in chlorophyll, resulting in an unbalanced photosynthetic apparatus in the cyanobacterium Synechocytis sp. PCC6803

Pohland,

Bernát,

Geimer

et al. 2024

Photosynth Res

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Evaluation of sucrose as carbon source in mixotrophic culture of Arthrospira platensis Gomont 1892

Tosuner¹,

Ürek²

2020

Aquat Res

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Cyanobacteria are photosynthetic microorganisms that use CO 2 as carbon source and sunlight as energy source. Although phototrophic cultivation is widely used in cyanobacterium production, heterotrophic and mixotrophic cultivations attract attention among researchers. In this study the effect of different concentrations (0[control]-0.25-2.5-10-50 mM) of sucrose on the growth of Arthrospira platensis under mixotrophic cultivation was investigated. The purpose of this study was to investigate whether A. platensis biomass production could be performed regardless of high light intensity. Biomass, chlorophyll, lipid and carbohydrate contents were determined by spectrophotometrically. Also the physicochemical properties of the produced cyanobacterium were investigated by FTIR, TGA and DSC. The highest biomass productivity was detected as 1.33 g/L/day in the medium containing 2.5 mM sucrose and the specific growth rate increased 1.32 fold as compared to phototrophic culture. Additionally, the highest lipid content (3.68 ±0.17 mg/g cell) was determined in the same medium. This suggests that A. platensis has adapted to the medium that contains low sucrose concentrations. Also, this study showed that sucrose containing medium supports lipid production.

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Cultivation of Arthrospira platensis in heterotrophic and mixotrophic conditions with different concentrations of whey

Tosuner¹,

ÜREK²

2022

Aquat Res

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Wastes left over from human food production is commonly used to produce feed for animals, which is an important issue for a rational utilization of food sources globally, and a topic that attracts researcher for the establishment of best food production management. Whey as a side product from cheese production has great potentials in terms of nutritional value for both human food and animal feed production. This study aimed to investigate the possible use of whey (1, 10 and 30%, v/v) as an external carbon source for mixotrophic and heterotrophic cultivation of the cyanobacterium Arthrospira platensis. The highest specific growth rate (µ = 0.2 day-1), protein (3.76 ±0.14 mg/ g cell) and lipid (4.67 ±0.18 mg/g cell) contents were detected in heterotrophic culture while the highest chlorophyll-a (292.39 ±1.31 mg/ g cell) and total carbohydrate (1.42 ±0.07 mg/ g cell) contents were found in mixotrophic culture. In heterotrophic cultivation, it can be noted that the absorbed organic carbon source increased cell counts and triggered especially lipid production. In the mixotrophic cultivation, carbon absorbed from the culture medium or CO2 captured with chlorophyll was utilized in the production of total carbohydrate. This study provides evidence that a cyanobacterium can adapt to heterotrophic conditions without light, creating an example for an economic and ecological production model for biochemical components.

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Cited by 3 publications

References 31 publications

Mg2+ limitation leads to a decrease in chlorophyll, resulting in an unbalanced photosynthetic apparatus in the cyanobacterium Synechocytis sp. PCC6803

Mg2+ limitation leads to a decrease in chlorophyll, resulting in an unbalanced photosynthetic apparatus in the cyanobacterium Synechocytis sp. PCC6803

Evaluation of sucrose as carbon source in mixotrophic culture of Arthrospira platensis Gomont 1892

Cultivation of Arthrospira platensis in heterotrophic and mixotrophic conditions with different concentrations of whey

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