Skip to main content
APS Plant Health 2025 Main banner
Icon Legend
This session is not in your schedule.
This session is in your schedule. Click again to remove it.

POSTERS: Population Biology Genetics I

P-547 - Telomere-to-telomore phased genome assemblies for 63 species of Phytophthora

Monday, August 4, 2025
4:30 PM - 5:15 PM HST
Location: Exhibit Hall 3
Abstract Text:

Many species in the Phytophthora genus are important pathogens of plants in cultivated and natural ecosystems. While a few key species have been well studied, most of the over 200 species remain largely understudied, leaving many outstanding questions on their evolutionary history to be explored. We developed high quality genome assemblies for members of each major clade in the genus.  We used Oxford Nanopore technology to sequence 97 different isolates and 63 unique species from 11 and 24 different clades and subclades, respectively. Collapsed assemblies ranged from 12 to 351 contigs and varied considerably between 40 and 232 Mb in size.  We observed large variation within and among taxa. These include for example variations in ploidy and aneuploidy, repeat families and content. We will describe a unifying workflow used to generate high-quality collapsed and haplotype-level assemblies allowing direct comparisons among assemblies. We will also present summary statistics, models, and other assessment results revealing extreme plasticity of Phytophthora genomes. Both the computational workflow and the genome assemblies are valuable resources to uncover strategies used by Phytophthora species for adaptation and evolution.