<Emphasis Type="Italic">Delftia</Emphasis> sp. JD2: a potential Cr(VI)-reducing agent with plant growth-promoting activity |
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Authors: | María?A?Morel Martha?C?Ubalde Victoria?Bra?a Email author" target="_blank">Susana?Castro-SowinskiEmail author |
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Institution: | 1.Unidad de Microbiología Molecular,Instituto de Investigaciones Biológicas Clemente Estable (IIBCE),Montevideo,Uruguay;2.Sección Bioquímica y Biología Molecular, Instituto de Biología, Facultad de Ciencias,Universidad de la República,Montevideo,Uruguay |
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Abstract: | A chromium (Cr)-resistant bacterium isolated from soil containing 6,000 mg/kg of Cr was identified based on 16S rRNA gene
sequence analysis as Delftia, and designated as JD2. Growth of JD2 was accompanied with reduction of Cr(VI) to Cr(III) in liquid medium initially containing
100 mg/L Cr(VI), the maximum concentration allowing growth. JD2 showed NADH/NADPH-dependent reductase activity associated
with the soluble fraction of cells. The results suggest that JD2 might be a good candidate for the treatment of highly Cr(VI)-contaminated
water and/or industrial effluents. The isolate produced indole-3-acetic acid in the presence and absence of Cr(VI) and showed
free-living nitrogen-fixing activity possibly attributable to a V-nitrogenase. JD2 did not counteract the harmful effect of
Cr(VI) during leguminous plant growth and nodulation by rhizobial strains but functioned as a “helper” bacterium to enhance
the performance of rhizobial inoculant strains during inoculation of alfalfa and clover (used as model plants to study plant
growth-promoting activity) in the absence of Cr(VI). |
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