Comparative Responses of Silicon to Reduce Cadmium and Enrich Selenium in Rice Varieties

Area of Science:

• Agricultural Science
• Environmental Science
• Plant Science

Background:

• Cadmium (Cd) contamination poses a significant threat to rice cultivation in China.
• Identifying rice genotypes with robust heavy metal resistance is crucial for food security.
• Silicon (Si) and Selenium (Se) are investigated for their potential to mitigate Cd toxicity.

Purpose of the Study:

• To examine the mitigation effect of silicon (Si) on cadmium (Cd) toxicity in Se-enriched and non-Se-enriched rice genotypes.
• To assess the impact of Si on Cd uptake, rice growth, yield, and Se accumulation.
• To determine the efficacy of Se-enriched rice for cultivation in Cd-contaminated areas.

Main Methods:

• Experiment comparing Se-enriched (Z3055B) and non-Se-enriched (G46B) rice genotypes under varying Si treatments.
• Quantification of Cd and Se content in different rice tissues (roots, stems, leaves, grains).
• Measurement of rice yield, biomass, and overall plant growth parameters.

Main Results:

• A basal dose of Si significantly improved rice growth, quality, and yield by reducing Cd content across all plant parts.
• Si application increased biomass and Se content in brown rice for both genotypes.
• Se-enriched rice exhibited higher Se accumulation and showed reduced Cd translocation from roots to shoots with Si application.

Conclusions:

• Silicon effectively mitigates cadmium toxicity and enhances rice productivity and quality.
• Se-enriched rice genotypes demonstrate superior resilience and are a promising option for cultivation in Cd-contaminated environments.
• The findings support the use of Si fertilization and Se-enriched rice for sustainable agriculture in heavy metal-polluted regions.