A happy accident: a novel turfgrass reference genome

Area of Science:

• Plant Genomics
• Bioinformatics
• Turfgrass Science

Background:

• Poa pratensis (Kentucky bluegrass) is a globally significant cool-season turfgrass with high economic value.
• Previous genome assembly attempts were hindered by its large size, polyploidy, apomixis, and hybridization complexity.
• A lack of a reference genome limited genetic research and breeding efforts in Kentucky bluegrass.

Purpose of the Study:

• To report the de novo assembly and annotation of a reference genome for Poa pratensis.
• To demonstrate the utility of the new reference genome for population genetic analyses.
• To provide a foundational resource for future turfgrass breeding and research.

Main Methods:

• Utilized PacBio long reads and Bionano optical mapping for genome assembly.
• Performed de novo assembly resulting in a 6.09 Gbp draft genome with 118 scaffolds.
• Annotated 256,000 gene models and identified transposable elements.

Main Results:

• Successfully assembled a draft reference genome for Poa pratensis (Kentucky bluegrass).
• The assembly comprises 6.09 Gbp with an N50 scaffold length of 65.1 Mbp.
• Analysis of North American populations using the genome confirmed high genetic diversity and population structure.

Conclusions:

• The developed reference genome is a critical resource for Poa pratensis research and breeding.
• This genome facilitates deeper understanding of genetic diversity and population dynamics in Kentucky bluegrass.
• The annotation provides insights into the genomic composition, including 58% transposable elements.