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Maize and bacteria: A 1-2 punch knocks copper out of stamp sand
Date:3/5/2014

rmers working with marginal soils, Wusirika said. The usual techniqueapplying bacteria to seedlings' roots before transplantingworks fine in the lab but would be impractical for large-scale projects. This could open the door to simple, practical remediation of copper-contaminated soils.

But the mere fact that all the plants grown with bacteria did so well also piqued his curiosity. "When we saw this, we wondered what the bacteria were doing to the soil," Wusirika said. "Based on our research, it looks like they are improving enzyme activity and increasing soil fertility," in part by freeing up phosphorus that had been locked in the rock.

The bacteria are also changing copper into a form that the plants can take up. "With bacteria, the exchangeable copper is increased three times," he said. "There's still a lot of copper that's not available, but it is moving in the right direction."

By analyzing metabolic compounds, the team was able to show that the bacteria enhance photosynthesis and help the plants make growth hormones. Bacteria also appear to affect the amount phenolics produced by the maize. Phenolics are antioxidants similar to those in grapes and red wine.

Compared to plants grown in normal soil without bacteria, plants grown in stamp sand alone showed a five-fold increase in phenolics. However, phenolics in plants grown in stamp sand with bacteria showed a lesser increase.

"Growing in stamp sand is very stressful for plants, and they respond by increasing their antioxidant production," Wusirika said. "Adding the metal-resistant bacteria enables the plants to cope with stress better, resulting in reduced levels of phenolics."

"There's still a lot to understand here," he added. "We'd like to do a study on stamp sands in the field, and we'd also like to work with plants besides maize. We think this work has applications in organic agriculture as well as remediation."


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Contact: Marcia Goodrich
mlgoodri@mtu.edu
906-487-2343
Michigan Technological University
Source:Eurekalert  

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Maize and bacteria: A 1-2 punch knocks copper out of stamp sand
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