Ma et al. 2022 — Cerium dioxide nanoparticles and Cr-resistant bacteria reduce chromium toxicity in sunflower

This pot study tested cerium dioxide (CeO₂) nanoparticles and a chromium-resistant bacterium (Staphylococcus aureus) for alleviating chromium stress in sunflower grown on Cr-contaminated soil. It is upstream mechanism evidence on chromium soil-to-plant transfer and stress mitigation; it reports no retail food occurrence and is context-only for Heavy Metal Index purposes.

Key numbers

• Sunflower grown in Cr-contaminated soil at 0, 25, and 50 mg/kg; CeO₂ NPs applied at 0, 25, 50 mg/L, with and without S. aureus.
• CeO₂ NPs improved growth/biomass, reduced oxidative stress, and raised enzymatic activity under Cr stress; S. aureus further enhanced the effect, the maximum benefit being the combined treatment.
• At Cr 50 mg/kg with CeO₂ 50 mg/L: chlorophyll a rose from 1.2 to 2.0 and chlorophyll b from 0.5 to 0.8 (mg/g FW), and electrolyte leakage fell from 121% to 104%.

Methods (brief)

Factorial pot experiment crossing soil Cr level, CeO₂ nanoparticle dose, and S. aureus inoculation; growth, oxidative-stress markers, pigment content, and enzyme activities measured in sunflower.

Implications

Certification: Contributes nothing to HMT&C threshold pools. Mechanism context on chromium (including hexavalent Cr) toxicity and amendment-based mitigation; route as exposure/mechanism context to Soil-to-plant transfer of heavy metals, Chromium, and Agronomic mitigation.

Courses: Example of nanoparticle- and microbe-assisted alleviation of chromium stress in a crop plant.

App: No contamination_profile blocks are touched.

Microbiome: WikiBiome federation signpost — chromium-resistant bacterial inoculant modulating metal stress.

Wiki pages this source may touch

• Chromium
• Soil-to-plant transfer of heavy metals
• Agronomic mitigation
• Microbiome

Verification notes

• Evidence tier B: primary pot experiment in a peer-reviewed journal (Frontiers in Plant Science, CC BY 4.0).
• Page grounded in the published abstract and bibliographic metadata; values preserved as printed. Full-text extraction can follow on synthesis.
• metals: [Cr, Cr-VI] — the source emphasizes hexavalent chromium toxicity; both carried for routing.
• ingredients: [] / products: [] correct: experimental stress-mitigation context, not retail food occurrence; sunflower is the test species, carried in matrices.
• Part 2 direction-of-edit check: adds upstream mechanism literature; neutral to HMT&C thresholds, moves toward the literature.

Page history

The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.