AI Insight
Researchers from Penn State and international institutions have identified genetic differences between cacao varieties that affect how the plants absorb and distribute cadmium, a toxic heavy metal naturally present in Latin American and Caribbean soils. The study compared two cacao varieties and found that some genotypes take up less cadmium than others, with variations in how the metal moves through different parts of the plant. This genetic variation could enable breeders to develop cacao cultivars that accumulate lower levels of cadmium in cocoa beans used for chocolate production.
Why it matters
These findings provide a scientific basis for breeding programs aimed at reducing cadmium contamination in chocolate products, which is a significant food safety concern since cadmium accumulates in human organs and can cause health problems. Understanding the genetic mechanisms of cadmium uptake could help farmers in affected regions grow cacao that meets international safety standards while maintaining their livelihoods.
Understand the Science
Cadmium is a naturally occurring, toxic heavy metal found in many soils across Latin America and the Caribbean, where cacao trees are widely cultivated. It makes its way into cocoa seeds, called beans, that are roasted and made into chocolate, according to the Food and Agriculture Organization of the United Nations (FAO)—but some cacao varieties take up less of the toxic element than others. An international team of researchers, including Penn State scientists, found genetic differences in how two varieties managed cadmium uptake and facilitated the metal’s movement throughout the plant.
Source: Cacao genetics could help breeders reduce heavy metal levels in cocoa beans