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Characterization of plant growth-promoting Bacillus edaphicus NBT and its effect on lead uptake by Indian mustard in a lead-amended soil

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The plant growth promotion characteristics of a heavy-metal-resistant strain of Bacillus edaphicus NBT was characterized. The strain was also evaluated for promoting plant growth and lead (Pb) uptake of Brassica juncea L. Czern (Indian mustard) in soil artificially contaminated with 0, 400, and 800 mg Pb·kg-1 soil. Atomic absorption spectrometer analysis demonstrated that strain NBT could release water-soluble Pb from lead carbonate in the solution. Strain NBT had the capacity to produce indole acetic acid, siderophores, and 1-aminocyclopropane-1-carboxylate deaminase. Low and high Pb treatments significantly decreased the growth of Indian mustard. Inoculation with strain NBT was found to increase root dry mass (ranging from 16% to 22%) and above-ground tissue dry mass (ranging from 24% to 30%) of Indian mustard in the Pb-amended soil. Strain NBT was able to mobilize Pb efficiently in plants in Pb-amended soil. In the soil treated with 400 and 800 mg Pb·kg-1 soil, the increase in Pb uptake varied from 18% to 46% in live bacterium-inoculated Indian mustard plants compared with dead bacterium-inoculated control. The strain was also able to colonize and develop in the rhizosphere soil of Indian mustard after root inoculation.

Nous avons caractérisé les propriétés reliées à la promotion de la croissance des plantes d’une souche de Bacillus edaphicus NBT résistante aux métaux lourds. La souche a aussi été évaluée relativement à la promotion de la croissance et à la captation de plomb de Brassica juncea L. Czern (moutarde chinoise) cultivée dans un sol contaminé artificiellement avec 0, 400 et 800 mg Pb·kg-1 sol. Une analyse spectrométrique par absorption atomique a démontré que la souche NBT pouvait libérer du Pb soluble dans l’eau à partir de carbonate de plomb en solution. La souche NBT avait la capacité de produire de l’acide indole acétique, des sidérophores et la 1-aminocyclopropane-1-carboxylate désaminase. Des traitements avec de faibles ou de fortes doses de Pb ont ralenti significativement la croissance de la moutarde chinoise. Une inoculation avec la souche NBT a augmenté le poids sec de racines (de 16 % à 22 %) ainsi que le poids sec de tissus hors-terre (de 24 % à 30 %) de moutarde chinoise cultivée sur un sol amendé avec du Pb. La souche NBT pouvait mobiliser le Pb de façon efficace chez les plants d’un sol amendé avec du Pb. Sur un sol traité avec 400 et 800 mg Pb·kg-1 sol, l’augmentation de capture du Pb variait de 18 % à 46 % chez les plants de moutarde chinoise inoculés avec des bactéries vivantes comparativement aux contrôles inoculés avec des bactéries mortes. Après l’inoculation des racines, la souche pouvait aussi coloniser la rhizosphère de la moutarde chinoise et se développer.

Document Type: Research Article

Publication date: May 1, 2008

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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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