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Fusarium  species have been identified as pathogens causing many different plant diseases, and here we report an emerging banana leaf blight (BLB) caused by  F. sacchari  ( Fs ) discovered in Guangdong, China. From the symptomatic tissues collected in the field, a fungal isolate was obtained, which induced similar symptoms on healthy banana seedlings after inoculation. Koch’s postulates were fulfilled after the re-isolation of the pathogen. Phylogenetic analysis on two gene segments and the whole genome sequence identified the pathogen belonging to  Fs  and named as  Fs  str. FS66. A 45.74 Mb genome of FS66 was acquired through  de novo  assembly using long-read sequencing data, and its contig N50 (1.97 Mb) is more than 10-fold larger than the previously available genome in the species. Based on transcriptome sequencing and  ab initio  gene annotation, a total of 14,486 protein-encoding genes and 418 non-coding RNAs were predicted. A total of 48 metabolite biosynthetic gene clusters including the fusaric acid biosynthesis gene cluster were predicted  in silico  in the FS66 genome. Comparison between FS66 and other 11 Fusarium genomes identified tens to hundreds of genes specifically gained and lost in FS66, including some previously correlated with  Fusarium  pathogenicity. The FS66 genome also harbors widespread gene transfer on the core chromosomes putatively from  F. oxysporum  species complex (FOSC), including 30 involved in  Fusarium  pathogenicity/virulence. This study not only reports the BLB caused by  Fs , but also provides important information and clues for further understanding of the genome evolution among pathogenic  Fusarium  species.

The Genome of Banana Leaf Blight Pathogen Fusarium sacchari str. FS66 Harbors Widespread Gene Transfer From Fusarium oxysporum