Integrating pharmacologically important flora into phytoremediation: The role of bacillus strains in mitigating chromium toxicity and enhancing rhizostabilization.
Ravi MS, Padikasan IA
Phytoremediation
Contaminated brownfields near tanneries and factories could one day be restored using garden-worthy medicinal shrubs paired with naturally occurring soil bacteria — no chemicals, no excavation, just living roots doing the work.
Scientists tested whether certain beneficial soil bacteria could help two medicinal plants survive and thrive in soil heavily contaminated with chromium, a toxic metal from leather tanning and industrial waste. The bacteria acted like a shield, reducing the plant's stress and keeping dangerous chromium trapped in the roots instead of moving up into leaves and stems. This is exciting because it means we could use living plants — including ones with medicinal value — to quietly clean up polluted land over time.
Key Findings
Two Bacillus bacteria strains (isolated from tannery-contaminated soil) significantly improved plant biomass in soil containing 300 mg/kg of chromium(VI), a highly toxic concentration.
PGPR inoculation reduced antioxidant enzyme activity by up to 66.74% in Solanum trilobatum and 56.97% in Justicia adhatoda, indicating the bacteria substantially relieved oxidative stress caused by chromium.
Bacterial treatment shifted both medicinal plants toward rhizostabilization — locking chromium in the roots and dramatically reducing its translocation to above-ground tissues, limiting further environmental spread.
chevron_right Technical Summary
Researchers found that two common soil bacteria can help medicinal plants clean up chromium pollution from industrial sites, keeping the toxic metal locked in the roots rather than spreading to plant tissue or groundwater.
Abstract Preview
Plant Growth Promoting Rhizobacteria (PGPR) offer a cost-effective, eco-friendly solution for Cr(VI) bioremediation. This study evaluates the medicinal plants Justicia adhatoda and Solanum trilobat...
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Justicia adhatoda commonly known in English as Malabar nut, adulsa, adhatoda, vasa, vasaka, is native to Asia. Adathoda means 'untouched by goats' in Tamil. The name derives from the fact that animals like goats do not eat this plant due to its extreme bitter taste.