Improved pea reference genome and pan-genome highlight genomic features and evolutionary characteristics

Area of Science:

• Genomics
• Plant Breeding
• Genetics

Background:

• High-quality reference genomes are crucial for functional genomics and crop improvement.
• Existing pea genome resources have limitations in contiguity and accuracy, especially in complex genomic regions.

Purpose of the Study:

• To generate a high-quality de novo genome assembly and annotation for the pea cultivar ZW6.
• To investigate pea genome diversity and phylogenetic relationships.
• To identify genes associated with important agronomic traits in pea.

Main Methods:

• De novo genome assembly and annotation of pea cultivar ZW6.
• Comparative genomics of 118 cultivated and wild pea accessions.
• Quantitative trait locus (QTL) analysis.
• Pan-genome construction for 116 pea accessions.

Main Results:

• Achieved a ZW6 genome assembly with a contig N50 of 8.98 Mb, a 243-fold increase in contig length and improved sequence quality in repeat regions.
• Phylogenetic analysis confirmed Pisum abyssinicum as a distinct species.
• Identified known genes (Le/le, R/r) and candidate genes for pod form, and uncovered distinct functional enrichments in pan-genes of P. abyssinicum and P. fulvum.

Conclusions:

• The ZW6 genome assembly provides a significantly improved resource for pea functional genomics.
• The study clarifies taxonomic relationships within the Pisum genus.
• Identified genetic resources and candidate genes hold promise for future pea breeding programs.