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Survival of phosphate-solubilizing bacteria against DNA damaging agents

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Phosphate-solubilizing bacteria (PSBs) were isolated from different plant rhizosphere soils of various agroecological regions of India. These isolates showed synthesis of pyrroloquinoline quinone (PQQ), production of gluconic acid, and release of phosphorus from insoluble tricalcium phosphate. The bacterial isolates synthesizing PQQ also showed higher tolerance to ultraviolet C radiation and mitomycin C as compared to Escherichia coli but were less tolerant than Deinococcus radiodurans. Unlike E. coli, PSB isolates showed higher tolerance to DNA damage when grown in the absence of inorganic phosphate. Higher tolerance to ultraviolet C radiation and oxidative stress in these PSBs grown under PQQ synthesis inducible conditions, namely phosphate starvation, might suggest the possible additional role of this redox cofactor in the survival of these isolates under extreme abiotic stress conditions.

Des bactéries solubilisant le phosphate ont été isolées de différents sols de la rhizophère de végétaux présents dans des régions agro-écologiques variées de l’Inde. Ces isolats montraient des activités de synthèse de la pyrroloquinoline quinone (PQQ), de production d’acide gluconique et de libération de phosphore à partir de phosphate tricalcique insoluble. Les isolats bactériens qui synthétisaient de PQQ étaient également plus tolérants aux UVC et à la mitomycine C qu’Escherichia coli, mais moins tolérants que Deinococcus radiodurans. Contrairement à E. coli, les isolats bactériens solubilisant le phosphate étaient plus tolérants aux dommages à l’ADN lorsque cultivés en absence de phosphate inorganique. La tolérance plus élevée aux radiation ultraviolette C et au stress oxydatif de ces bactéries solubilisant le phosphate lorsqu’elles étaient cultivées en condition de synthèse inductible de PQQ, c.-à-d. privées de phosphate, pourrait suggérer que ce cofacteur impliqué dans les processus d’oxydoréduction joue un rôle supplémentaire dans la survie de ces isolats cultivés dans des conditions de stress abiotique extrême.

Document Type: Research Article

Publication date: October 1, 2010

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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