Domestication constraints and engineering trajectories for cereal grain protein biofortification. [Photo/news.hzau.edu.cn]

A breakthrough review titled "Cereal protein biofortification at the interface of nutrition, yield and sustainability" was published in Nature Plants on March 31. Led by Huazhong Agricultural University in collaboration with the International Rice Research Institute (Philippines) and the Max Planck Institute (Germany), the study addresses the global challenge of protein malnutrition by proposing genetic pathways to enhance staple crops like maize, rice, and wheat.

Cereals provide the majority of global calories, yet their nutritional value is often limited by low essential amino acid content. As China's most widely planted crop, maize serves as a primary energy source for both human diets and livestock feed. Increasing its protein density could optimize human nutrition while significantly reducing the feed industry's reliance on imported soybeans, thereby lowering costs and fostering agricultural sustainability.

The review synthesizes recent progress in decoupling protein accumulation from yield penalties — a historical constraint in crop breeding. By leveraging natural genetic variations and gene editing, researchers have identified strategies to improve nitrogen acquisition and storage protein composition without sacrificing starch levels. These advancements enable the precise enhancement of grain quality to meet rising population pressures.

Furthermore, the authors highlight the urgent need for "climate-resilient" crops. Emerging environmental threats, such as rising CO₂ levels and heat stress, risk diluting protein concentrations and degrading grain appearance. By integrating heat-tolerant genes with high-yield traits, this collaborative research positions cereal biofortification as a scalable, equitable pathway toward a more sustainable and nutritious global food system.