Some Fe chelate forms in culture media induce oxidative stress in the cyanobacterium Spirulina platensis
2017
Ghasemi, R. | Nilforooshan, Z. | Shams, M.
This study investigated impacts of iron in different concentrations (3.5 – 100 µM) and different chelate forms including FeEDTA, FeEDDHSA and FeEDDHA on growth, chlorophyll, proline, malondialdehyde (MDA), O2 production and iron concentration in dry biomass in the cyanobacterium Spirulina platensis. Higher growth, chlorophyll concentration and O2 production observed in forms of FeEDTA and FeEDDHSA at higher concentrations (more than 50 µM). Conversely, MDA concentration and proline content were higher in FeEDDHA; inother words, the more the concentration of FeEDDHA in medium, the more the concentration of proline in the cells. There was no difference between various concentrations of the used FeEDDHA in MDA content of the cells. Chlorophyll concentration was lower in form of FeEDDHA in comparison with the other chelate forms. Iron concentration in dry weight increased as concentration of iron in medium increased in the all of used chelate forms. Atlower concentrations of Fe in medium, Fe concentrations in the cells were higher in form of FeEDDHA but at higher concentrations in medium it was observed in form of FeEDDHSA. Increased amounts of MDA and proline were represented the occurrence of oxidative stress inthe test microorganism under iron form FeEDDHA, while increased levels of O2 production demonstrated an increase in growth via higher photosynthesis in the chelate forms FeEDTA and FeEDDHSA. The results indicated that FeEDDHSA acts as a promising source for iron inspirulina culture.
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