Iron-oxidizing bacteria are associated with ferric hydroxide precipitates (Fe-plaque) on the roots of wetland plants

Article Abstract:

Iron-oxidizing bacteria exist in the rhizosphere of wetland plants found in a diverse environment with varying Fe(II) concentrations and pH range. The bacteria are related to ferric hydroxide precipitates on the roots of wetland plants and are enriched on roots from all four species under study. Sagittaria australis and Leersia oryzoides differ with respect to correlation between cell numbers and the total amount of iron present in the roots. These findings suggest that culturable iron-oxidizing bacteria associated with ferric hydroxide precipitates can be found in the rhizosphere.

Environmental aspects, Roots (Botany), Bacteria, Phytopathogenic, Phytopathogenic bacteria, Ferric oxide, Rhizosphere, Plant morphology, Wetland flora, Wetland plants

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Anaerobic growth of Thiobacillus ferrooxidans

Article Abstract:

The ability of Thiobacillus ferrooxidans to use ferric iron as an electron acceptor under anaerobic condition was demonstrated. Anaerobic oxidation of elemental sulfur with ferric sulfate as an electron acceptor supported the exponential growth of T. ferrooxidans, accompanied by an increase of the ferrous iron concentration and a decrease of the culture pH. There was no growth in the absence of elemental sulfur or ferric iron. There was a linear relationship between the ferrous iron concentration and cell counts.

Anaerobiosis

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Metal regulation of siderophore synthesis in Pseudomonas aeruginosa and functional effects of siderophore-metal complexes

Article Abstract:

The ability of the Pseudomonas aeruginosa siderophores, pyochelin and pyoverdin, to sequester transition metals other than iron was assessed. The results showed that other transition metals could mimick the functional effects of Fe(III). The results pointed specifically to the ability of Co(II) and Mo(VI) to reduce pyochelin synthesis and ferripyochelin uptake. These results indicate a functional role for the uptake Co(II) and Mo(VI) during conditions of iron limitation.

Pseudomonas aeruginosa, Cobalt, Molybdenum

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