Large and stable genome edits at the sorghum alpha kafirin locus result in changes in chromatin accessibility and globally increased expression of genes encoding lysine enrichment

Genetic mechanisms, biological function, and biotechnological advance in sorghum tannins research

Sorghum (Sorghum bicolor) holds a unique position in the human diet and serves as a stable food source in many developing countries especially in African and south Asian regions. Tannins, the primary secondary metabolites in sorghum, are pivotal in determining its characteristic bitter taste. Beyond their influence on flavor, tannins play a vital role in sorghum's resistance to biotic and abiotic stresses and serve as key indicators of grain quality. The concentration of tannins significantly affects the potential for diverse applications of sorghum. This review provides a comprehensive analysis of sorghum tannins, focusing on their genetic basis, biological activities, and biosynthesis mechanisms. It highlights the relationship between tannin levels and grain color and delves into the underlying biogenetic pathways. Furthermore, the potential of functional genomics and biotechnological approaches in precisely controlling tannin levels for sorghum breeding is discussed. This study aims to offer valuable insights and perspectives for advancing both the scientific understanding and practical applications of sorghum tannins.

Reducing Acrylamide Formation Potential by Targeting Free Asparagine Accumulation in Seeds

Acrylamide is a probable carcinogen in humans and is formed when reducing sugars react with free asparagine (Asn) during thermal processing of food. Although breeding for low reducing sugars worked well in potatoes, it is less successful in cereals. However, reducing free Asn in cereals has great potential for reducing acrylamide formation, despite the role that Asn plays in nitrogen transport and amino acid biosynthesis. In this perspective, we summarize the efforts aimed at reducing free Asn in cereal grains and discuss the potentials and challenges associated with targeting this essential amino acid, especially in a seed-specific manner.