Towards practical cadmium phytoextraction with Noccaea caerulescens.

Area of Science:

• Environmental Science
• Biotechnology
• Agronomy

Background:

• Localized cadmium (Cd) and zinc (Zn) contamination poses environmental risks.
• Phytoextraction using hyperaccumulators is a sustainable remediation strategy.
• Noccaea caerulescens is a known hyperaccumulator with potential for phytoremediation.

Purpose of the Study:

• To evaluate the phytoextraction potential of Noccaea caerulescens populations from southern France in Thailand.
• To investigate the effects of soil pH, fertilization, and fungicide application on metal uptake.
• To determine optimal conditions for Cd and Zn removal from contaminated rice paddy soils.

Main Methods:

• Field trials were conducted with N. caerulescens populations transplanted into contaminated Thai soils.
• Soil treatments included variations in pH, fertilization, and fungicide application.
• Plant biomass, shoot/root Cd and Zn concentrations, translocation factors, and bioaccumulation factors were measured.

Main Results:

• Shoot biomass ranged from 280-650 kg ha(-1) DW.
• Shoot Cd and Zn concentrations reached 460-600 mg kg(-1) and 2600-2900 mg kg(-1) DW, respectively.
• Cadmium and Zn translocation factors ranged from 0.91-1.0 and 1.7-2.1, with bioaccumulation factors of 12-15 and 1.2-1.3.

Conclusions:

• Noccaea caerulescens demonstrates significant potential for phytoextracting Cd and Zn from Thai rice paddy soils.
• Optimizing fungicidal sprays, acidic soil pH, planting density, and cropping period can enhance metal removal rates.
• Practical Cd and Zn phytoextraction from rice paddy soils in Thailand is feasible with optimized management strategies.