Bread Wheat Biofortification for Grain Carotenoid Content by Inter-Specific Breeding.

Area of Science:

• Agricultural Science
• Plant Breeding
• Biotechnology

Background:

• Bread wheat varieties typically have low grain carotenoid content due to selection for whitish flour.
• High grain yellow pigment content (YPC) is desirable in durum wheat for pasta production.
• Phytoene synthase 1 (Psy1) genes are key regulators of carotenoid biosynthesis in wheat.

Purpose of the Study:

• To enhance grain carotenoid content in bread wheat by transferring Psy1 genes from durum wheat.
• To develop carotenoid-enriched bread wheat lines through inter-specific hybridization.
• To evaluate the combined effect of Psy1-A1 and Psy1-B1 genes on carotenoid accumulation.

Main Methods:

• Inter-specific hybridization between durum and bread wheat.
• Marker-assisted selection (MAS) targeting Psy1-A1 and Psy1-B1 alleles.
• Development of pre-breeding lines with enhanced carotenoid content.

Main Results:

• Successful transfer of Psy1-A1 and Psy1-B1 genes from durum to bread wheat.
• Development of bread wheat pre-breeding lines exhibiting 16-23% mean increase in grain carotenoid content.
• Demonstration of the effectiveness of inter-specific breeding and MAS for carotenoid biofortification.

Conclusions:

• The study successfully created biofortified bread wheat lines with significantly higher carotenoid levels.
• These enhanced lines hold potential for new variety development or as parents in breeding programs.
• This approach offers a viable strategy for improving the nutritional quality of bread wheat.