Variations in Total Protein and Amino Acids in the Sequenced Sorghum Mutant Library.

Area of Science:

• Agricultural Science
• Plant Biology
• Biochemistry

Background:

• Sorghum (Sorghum bicolor) is a globally significant cereal crop.
• Nutritional quality limitations in sorghum food products stem from amino acid composition and protein digestibility, influenced by kafirins (seed storage proteins).

Purpose of the Study:

• To identify sorghum mutant lines with altered seed storage protein composition.
• To evaluate the impact of these alterations on amino acid profiles and overall protein content.
• To establish a genetic resource for improving sorghum grain quality.

Main Methods:

• Screening of 206 sorghum mutant lines with modified seed storage proteins.
• Wet chemistry analysis to quantify total protein content.
• Amino acid profiling, including 19 protein-bound and 4 non-protein amino acids.

Main Results:

• Identification of mutant lines exhibiting diverse essential and non-essential amino acid compositions.
• Discovery of mutants with nearly double the total protein content compared to wild-type (BTx623).
• Variations in amino acid profiles and protein content were observed across the mutant collection.

Conclusions:

• The identified sorghum mutants represent a significant genetic resource for enhancing grain nutritional quality.
• These mutants can aid in elucidating molecular mechanisms governing storage protein and starch biosynthesis in sorghum seeds.
• This study provides a foundation for developing improved sorghum varieties for food applications.