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Insight into the Phytoremediation Capability of Brassica juncea (v. Malopolska): Metal Accumulation and Antioxidant Enzyme Activity.

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Overview

This laboratory/hydroponic study examined metal accumulation and antioxidant enzyme responses in Brassica juncea variety Malopolska seedlings exposed to individual metal solutions (cadmium, copper, lead, zinc) at 50 µM. It is a mechanistic phytoremediation study, not a food safety occurrence study; metal concentrations in the growth medium far exceed agricultural soil levels.

Key numbers

  • B. juncea showed high tolerance index (>90%) for all four metals, confirming phytoremediation potential.
  • Root concentrations were substantially higher than shoot concentrations for all metals, particularly lead.
  • Under 50 µM lead (Pb): shoots ~1 µg/gDW, roots ~200 µg/gDW (approximate values from Figure 1).
  • Under 50 µM cadmium (Cd): shoots ~20 µg/gDW, roots ~60 µg/gDW (approximate values from Figure 1).
  • Uptake efficiencies: Cd 58%, Zn 55%, Cu 52%, Pb 38% from growth medium.
  • Antioxidant enzymes (SOD, CAT, APX, POX) showed elevated activity in root tissue under metal stress.

Methods

Hydroponic growth in Hoagland’s nutrient solution supplemented with individual metals at 50 µM; 24 h pre-exposure; biomass, metal concentrations, and enzyme activity measured in roots and shoots of seedlings.

Implications

This is a mechanistic study of metal accumulation under artificial laboratory conditions. The concentrations used (50 µM = ~11 mg/L for Cd; ~12 mg/L for Pb in solution) far exceed any natural soil condition. Results are relevant to understanding B. juncea as a hyperaccumulator for phytoremediation but should not be extrapolated to food safety occurrence in normally grown mustard. The root >> shoot gradient for Pb is consistent with field observations. This evidence routes as mechanism context.

Certification: not in HMT&C threshold pools. Routes to Cadmium, Lead, Soil-to-plant transfer of heavy metals, mitigation/phytoremediation.

App: No contamination_profile blocks are touched.

Microbiome: Not a focus of this source.

Update history

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