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Growth of canola (Brassica napus) in the presence of plant growth-promoting bacteria and either copper or polycyclic aromatic hydrocarbons

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Growth of canola (Brassica napus) seeds treated with plant growth-promoting bacteria in copper-contaminated and polycyclic aromatic hydrocarbon (PAH)-contaminated soils was monitored. Pseudomonas asplenii AC, isolated from PAH-contaminated soil, was transformed to express a bacterial gene encoding 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and both native and transformed bacteria were tested for growth promotion. Inoculation of seeds, grown in the presence of copper or creosote, with either native or transformed P. asplenii AC significantly increased root and shoot biomass. Native and transformed P. asplenii AC and transformed P. asplenii AC encapsulated in alginate were equally effective at promoting plant growth in copper-contaminated soils. In creosote-contaminated soils the native bacterium was the least effective, and the transformed encapsulated bacterium was the most effective in growth promotion.Key words: plant growth-promoting bacteria, phytoremediation, copper, polycyclic aromatic hydrocarbons, Brassica napus, ethylene, alginate encapsulation.

Nous avons examiné la croissance de graines de canola (Brassica napus) traitées avec des bactéries favorisant la croissance, dans des sols contaminés au cuivre ou aux hydrocarbures aromatiques polycycliques (HAP). Pseudomonas asplenii AC isolée de sols contaminés aux HAP a été transformée afin d'exprimer un gène bactérien codant la 1-aminocyclopropane-1-carboxylate (ACC) désaminase et les propriétés de promotion de croissance des cellules sauvages ou transformées ont été testées. L'inoculation des graines ayant cru en présence de cuivre ou de créosote en présence de P. asplenii AC sauvage ou transformée a résulté en une augmentation de la biomasse des racines et des pousses. Pseudomonas asplenii AC sauvage, transformée ou transformée et encapsulée dans l'alginate ont été aussi efficaces à promouvoir la croissance sur un sol contaminé au cuivre. Cependant, dans un sol contaminé à la créosote, les bactéries sauvages ont été les moins efficaces à promouvoir la croissance, alors que les bactéries transformées et encapsulées étaient les plus efficaces.Mots clés : bactérie favorisant la croissance, phytoremédiation, cuivre, hydrocarbures aromatiques polycycliques, Brassica napus, éthylène, encapsulation dans l'alginate.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2005

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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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