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Authors: Armitage, Andrew D and Taylor, Andrew and Sobczyk, Maria K and Baxter, Laura and Greenfield, Bethany P J and Bates, Helen J and Wilson, Fiona and Jackson, Alison C and Ott, Sascha and Harrison, Richard J and Clarkson, John P

A reference-quality assembly of Fusarium oxysporum f. sp. cepae (Foc), the causative agent of onion basal rot has been generated along with genomes of additional pathogenic and non-pathogenic isolates of onion. Phylogenetic analysis confirmed a single origin of the Foc pathogenic lineage. Genome alignments with other F. oxysporum ff. spp. and non pathogens revealed high levels of syntenic conservation of core chromosomes but little synteny between lineage specific (LS) chromosomes. Four LS contigs in Foc totaling 3.9?Mb were designated as pathogen-specific (PS). A two-fold increase in segmental duplication events was observed between LS regions of the genome compared to within core regions or from LS regions to the core. RNA-seq expression studies identified candidate effectors expressed in planta, consisting of both known effector homologs and novel candidates. FTF1 and a subset of other transcription factors implicated in regulation of effector expression were found to be expressed in planta.

Journal: Scientific reports
DOI: 10.1038/s41598-018-30335-7
Year: 2018

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