Complete genome assemblies of several Xylella fastidiosa subspecies multiplex strains reveals high phage content and novel plasmids
Published 2024-02-17
Keywords
- quarantine phytopathogens,
- prophages,
- hybrid assembly
How to Cite
Copyright (c) 2024 María Pilar VELASCO-AMO , Luis F. ARIAS-GIRALDO , Blanca B. LANDA
This work is licensed under a Creative Commons Attribution 4.0 International License.
Abstract
The Gram-negative bacterium Xylella fastidiosa (Xf) was originally found in the Americas, but has now been identified in more than 20 countries across America, Asia, and Europe. This plant pathogen is currently listed as a priority pest in Europe due to its socio-economic and ecological impacts. Within the three Xf subspecies fastidiosa, multiplex and pauca, subsp. multiplex displays a notably wider range of host plants than the other two subspecies. Comparative genomics may allow determination of how Xf subsp. multiplex adapts to new and diverse hosts and environments, so it is important that more genomes of this subspecies are defined. Twelve complete closed genomes sequences of Xf subsp. multiplex were obtained using a hybrid assembly approach combining Illumina and Oxford Nanopore technologies. The combined use of Canu and Unicycler assemblers enabled identification and closure of several plasmid sequences with high similarity to other plasmids described in strains of Xf subsp. fastidiosa and subsp. pauca. The analysis also revealed prophage sequences and contigs outside the chromosomes, annotated as phages. These new genomes, in conjunction with those existing in GenBank, will facilitate exploration of the evolutionary dynamics of Xf subsp. multiplex, its host adaptation mechanisms, and the potential emergence of novel strains of this important plant pathogen.
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