Differences in yield components and kernel Cd accumulation in response to Cd toxicity in four barley genotypes.

Area of Science:

• Agricultural Science
• Environmental Science
• Plant Science

Background:

• Cadmium (Cd) toxicity is a significant environmental concern affecting crop yield and food safety.
• Understanding genotypic variations in Cd uptake and accumulation is crucial for developing safer crops.

Purpose of the Study:

• To investigate genotypic differences in barley yield components under Cd toxicity.
• To analyze kernel Cd concentrations and their relationship with root and shoot Cd levels.
• To assess the effects of shading and awn-removal on Cd accumulation.

Main Methods:

• Greenhouse hydroponics experiment with four barley genotypes exposed to varying Cd levels.
• Measurement of root, shoot biomass, yield components, and Cd concentrations.
• Analysis of mineral element correlations (Zn, Cu, Mn, Fe) with Cd.
• Establishment of regression models for predicting kernel Cd levels.

Main Results:

• Barley genotypes exhibited differential tolerance to Cd toxicity, impacting biomass and yield.
• Cd accumulation in roots and shoots increased with external Cd levels and varied significantly among genotypes.
• Kernel Cd concentrations differed significantly, with one genotype showing high accumulation despite low root/shoot Cd.
• Awn-removal decreased kernel Cd, while shading had no significant effect.
• Strong positive correlations were found between grain Cd and both shoot and root Cd levels.

Conclusions:

• Genotypic variation plays a key role in barley's response to Cd toxicity and accumulation.
• Root and shoot Cd levels are reliable indicators for predicting grain Cd concentration at harvest.
• Developing predictive models based on early-stage root and shoot Cd measurements can aid in managing Cd contamination in barley.