The versatility of Delftia sp. isolates as tools for bioremediation and biofertilization technologies.

Two Pb(II)-resistant bacteria isolated from a soil containing 2,500 mg/kg of Pb were identified by 16S rRNA sequencing analysis as Delftia sp. and designated as 3C and 6C. Both isolates grew at a Pb(II) concentration of 62 mg/L and at the stationary phase showed a Pb(II)-sorption capability of 10 ± 1.

Delftia sp. JD2: a potential Cr(VI)-reducing agent with plant growth-promoting activity.

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.

Cellular and biochemical response to Cr(VI) in Stenotrophomonas sp.

Chromium (Cr)-resistant bacteria isolated from a soil with 6 g kg(-1) of Cr were identified based on 16S rRNA gene sequence analysis as a Stenotrophomonas, and designated as JD1. Growth of JD1 was accompanied by transformation of Cr(VI) to Cr(III) in liquid medium initially containing 300 mg L(-1) Cr(VI), the maximum concentration allowing growth. JD1 produced the highest levels of a Cr(VI)-binding exopolysaccharide when grown in medium with 100 mg L(-1) Cr(VI).