This grass locks toxic chromium safely away in its roots
Kumar P, Sharma A, Singh S, Maharana D, Kumar A
Phytoremediation
If you've ever gardened near an old industrial lot or tannery site, this grass shows how roots alone can trap a dangerous heavy metal before it spreads further into soil and groundwater.
Researchers grew a grass called Pennisetum pedicellatum in soil spiked with toxic chromium and found the plant pulls the metal up through its roots but mostly keeps it there instead of sending it into the leaves and stems. That's actually good news: it means the plant can stabilize contaminated soil without the chromium ending up in parts that animals or people might eat. They also found several chromium-tolerant bacteria living around the roots, hinting that plant and microbe teamwork could make future cleanup even more effective.
Key Findings
At the highest treatment (100 mg/kg Cr(VI)), roots accumulated 58.55 mg/kg chromium versus only 20.23 mg/kg in shoots, showing strong root sequestration.
Chromium uptake rose with both contamination level and exposure time over the 60-day, four-treatment greenhouse trial, though prolonged exposure hurt root and shoot growth.
Five chromium-associated rhizospheric bacteria (all Bacillus species, including B. foraminis, B. wudalianchiensis, B. australimaris, B. licheniformis, and B. paramycoides) were identified via 16S rRNA sequencing, though their functional roles weren't tested.
chevron_right Technical Summary
A fast-growing grass called Pennisetum pedicellatum can pull toxic hexavalent chromium out of contaminated soil and lock most of it safely in its roots, offering a cheap, plant-based way to clean up polluted ground.
Abstract Preview
Original paper
Phytoremediation of hexavalent chromium from soil via Pennisetum pedicellatum and chromium-resistant rhizospheric microflora: a synergistic approach.
Hexavalent chromium [Cr(VI)] is a persistent, highly toxic, and bioaccumulative contaminant that poses serious risks to soil ecosystems and human health. This study investigated the phytoremediatio...
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Cenchrus pedicellatus, previously Pennisetum pedicellatum, known simply as desho or as desho grass, is an indigenous grass of Ethiopia of the monocot angiosperm plant family Poaceae. It is also known as annual kyasuwa grass in Nigeria, bare in Mauritania, and deenanath grass in India. It grows in...