Difference between Pb and Cd accumulation in 19 elite maize inbred lines and application prospects

Area of Science:

• Agricultural Science
• Environmental Science
• Plant Science

Background:

• Heavy metal contamination in crop grains is a significant environmental and food safety issue.
• Lead (Pb) and cadmium (Cd) are common toxic heavy metals found in agricultural soils.
• Maize (Zea mays) is a globally important crop susceptible to heavy metal uptake.

Purpose of the Study:

• To investigate the accumulation of lead (Pb) and cadmium (Cd) in elite maize inbred lines and hybrid varieties.
• To identify maize genotypes suitable for breeding programs aimed at reducing heavy metal accumulation in crops.
• To screen maize inbred lines for their potential use in phytoremediation of heavy metal-contaminated soils.

Main Methods:

• Analysis of Pb and Cd accumulation in stems and leaves of 19 maize inbred lines and 3 hybrid varieties at the seedling stage.
• Statistical analysis to determine significant differences in heavy metal accumulation among genotypes.
• Correlation analysis between parent lines and their hybrids for Cd accumulation.

Main Results:

• Significant variations in Pb and Cd accumulation were observed among the investigated maize inbred lines.
• A significant correlation was found between the Cd accumulation of male parents and their corresponding hybrids.
• Specific inbred lines (S37, 9782, ES40) showed low Pb or Cd accumulation, suitable for breeding.
• Other inbred lines (178, R08, 48-2, Mo17ht) exhibited high Pb and Cd accumulation, indicating potential for phytoremediation.

Conclusions:

• Maize genotypes differ significantly in their capacity to accumulate Pb and Cd.
• Selection of specific inbred lines can facilitate breeding for reduced heavy metal uptake in crops.
• Certain maize inbred lines possess high heavy metal accumulation potential, making them candidates for phytoremediation strategies.