Towards a whole-genome sequence for rye (Secale cereale L.)

Area of Science:

• Plant genomics
• Crop science
• Bioinformatics

Background:

• Rye (Secale cereale L.) is a vital diploid crop in the Triticeae tribe, closely related to wheat and barley.
• It plays a significant role in food and feed production, particularly in Central and Eastern Europe.

Purpose of the Study:

• To generate a whole-genome draft sequence of rye.
• To facilitate comparative genomics, functional studies, and genome-based breeding in rye.

Main Methods:

• Whole-genome shotgun sequencing of the winter rye inbred line Lo7.
• De novo assembly of the rye genome.
• Prediction of rye gene models using homology to other grass genomes.
• Resequencing of multiple rye lines and a wild relative to identify genetic variants.
• Development of the Rye600k genotyping array.
• Anchoring sequence contigs to a genetic map and establishing a virtual gene order.

Main Results:

• A de novo assembly of the rye genome was generated, covering the majority of the low-copy portion.
• Over 90 million single nucleotide variants and short insertions/deletions were identified.
• A high-density genotyping array (Rye600k) was developed with over 600,000 markers.
• Genetic diversity and selection signals within rye breeding pools were characterized.

Conclusions:

• The rye whole-genome sequence represents a significant advancement for Triticeae genomics.
• This resource will accelerate functional genomics and marker-assisted breeding in rye.
• It provides a foundation for understanding rye diversity and improving crop resilience.