Reference genome assembly for Australian Ascochyta lentis isolate Al4

Area of Science:

• Plant Pathology
• Genomics
• Mycology

Background:

• Ascochyta lentis causes ascochyta blight in lentils, leading to substantial yield losses.
• While disease management strategies exist, evolving virulence in A. lentis isolates poses an ongoing threat.

Purpose of the Study:

• To generate the first genome assembly for the Australian A. lentis isolate Al4.
• To provide a genomic resource for understanding A. lentis evolution and virulence.

Main Methods:

• Integration of Illumina and PacBio SMRT sequencing data.
• Bioinformatic analysis for genome assembly and gene prediction.

Main Results:

• A near-complete genome assembly of 42 Mb with 11,638 predicted genes was generated.
• The assembly includes 21 full-length and 2 partial chromosomal contigs.
• 31 secondary metabolite clusters and 38 putative effectors were identified, many with unknown functions.

Conclusions:

• The A. lentis Al4 genome provides a valuable resource for studying fungal pathogen evolution.
• Comparative genomics revealed conserved synteny but also structural variations with A. rabiei.
• Secondary metabolite clusters are often located near transposable elements, a common feature in fungal pathogens.