Inactivation of Aeromonas hydrophila by Fe(II)-related-radical generation in oxidizing groundwaters

Article Abstract:

The Aeromonas hydrophila and various other bacterial species in the oxidizing groundwaters from the Snellegem and Beernam, Belgium, which consist of Fe2+ decrease due to the generation of free radicals. The addition of compounds such as ascorbic acid and catalase, and an Fe2+ chelator, which acts on the toxic oxygen species, prevents the decrease in the number of Aeromonas cells. Free radical generation in the water leads to decrease in the propylphosphonic acid level in these waters.

Analysis, Physiological aspects, Water, Aquatic microbiology, Marine bacteria, Oxidation-reduction reaction, Oxidation-reduction reactions, Iron, Iron (Metal), Free radicals (Chemistry), Free radicals

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Involvement of pyochelin and pyoverdin in suppression of Pythium-induced damping-off of tomato by Pseudomonas aeruginosa 7NSK2

Article Abstract:

A study was conducted to determine the role of the siderophores pyoverdin and pyochelin production by Pseudomonas aeruginosa 7NSK2 in the biological control of Pythium splendens. The production of both siderophores was found to be crucial to the attainment of high levels of protection against Pythium-induced postemergence damping-off. Siderophore-mediated iron competition was postulated as the reason for the observed antagonism and apparent interchangeability of the two compounds.

Suppression, Genetic, Suppressor mutation (Molecular genetics)

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Survival and plant growth promotion of detergent-adapted Pseudomonas fluorescens ANP15 and Pseudomonas aeruginosa 7NSK2

Article Abstract:

The detergents Tween 80, Igepal CO-720, N-lauroylsarcosine (sodium salt), and Dioctyl sulfosuccinate (sodium salt) enhance the survival of Pseudomonas (P.) aeruginosa 7NKS2 and P. fluorescens ANP15, and their ability to promote plant growth. Adaptation to detergent is similar in laboratory culture and in natural soil habitat. Innoculated strains increase the leaf and stem dry weights of yellow mustard, and grass dry weight.

Growth factors, Detergents, Synthetic, Detergents, Pseudomonas fluorescens, Plant growth promoting substances

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