Harnessing landrace diversity empowers wheat breeding

Area of Science:

• Agricultural Science
• Genetics
• Crop Breeding

Background:

• Food security relies on genetic diversity in staple crops.
• Modern wheat cultivars (Triticum aestivum) have limited genetic origins.
• Landrace collections offer untapped genetic resources.

Purpose of the Study:

• To analyze the genetic and phenotypic diversity within the A. E. Watkins bread wheat landrace collection.
• To identify and evaluate novel haplotypes from landraces for improving modern wheat cultivars.
• To establish a framework for utilizing landrace genetic diversity in crop improvement.

Main Methods:

• Whole-genome re-sequencing of 827 landraces and 208 modern cultivars.
• Decade-long in-depth field evaluation of phenotypic traits.
• Linkage disequilibrium and association genetics analyses.

Main Results:

• Modern wheat cultivars originate from only two of seven ancestral wheat groups.
• Five ancestral groups represent a significant, untapped source of genetic diversity.
• Identified numerous beneficial, landrace-specific haplotypes conferring superior traits.
• Assessed phenotypic effects of 44,338 introgressed Watkins-unique haplotypes.

Conclusions:

• The A. E. Watkins collection holds substantial genetic resources for wheat improvement.
• Systematic utilization of landrace diversity can enhance modern breeding strategies.
• This research provides a framework for achieving sustainable food security through crop genetic diversity.