Copper availability and accumulation by Portulaca oleracea Linn. stem cutting.

Area of Science:

• Environmental Science
• Plant Science
• Soil Science

Background:

• Copper (Cu) is an essential micronutrient for plants, but can be toxic at high concentrations.
• Soil properties, particularly clay content, significantly influence the availability and mobility of heavy metals like Cu.
• Portulaca oleracea (common purslane) is known for its resilience and potential use in phytoremediation.

Purpose of the Study:

• To investigate the copper (Cu) accumulation capacity of Portulaca oleracea stem cuttings in two contrasting soil types.
• To determine the effect of soil clay content on Cu availability and plant uptake.
• To assess the impact of Cu accumulation on the regenerative capacity and biomass of Portulaca oleracea.

Main Methods:

• Assessing Cu accumulation in Portulaca oleracea stem cuttings grown in alfisol and vertisol soils.
• Measuring DTPA-extractable Cu concentrations in soils.
• Evaluating the regenerative ability (leaves and roots) and biomass of stem cuttings under varying Cu concentrations.

Main Results:

• Cu accumulation in stem cuttings and DTPA-extractable Cu were higher in alfisol (low clay) than in vertisol (high clay).
• Increasing vertisol proportion in mixed soils decreased both soil available and plant-accumulated Cu.
• Higher Cu concentrations in soil and plant led to reduced leaf and root regeneration and decreased biomass.

Conclusions:

• Portulaca oleracea stem cuttings are effective accumulators of copper.
• Soil clay content plays a crucial role in modulating Cu availability, with higher clay content reducing plant-accessible Cu.
• The findings suggest that soil amendments, such as adding clay, could be a strategy to manage Cu availability for plants like Portulaca oleracea.