Complete mitochondrial genome of the fungal pathogen Fusarium oxysporum f. sp. palmarum responsible for fusarium wilt of palms

Summary

Scientists have decoded the complete genetic instruction manual for a fungus that causes a deadly disease in palm trees. The fungus, Fusarium oxysporum f. sp. palmarum, kills palm trees by causing one-sided leaf death that spreads upward through the canopy. By sequencing the fungus’s mitochondrial genome—the energy-producing part of its cells—researchers have created a tool that can help quickly and accurately identify this pathogen in infected plants. This discovery will help nurseries and gardeners detect and prevent the spread of this destructive disease.

Background

Fusarium oxysporum f. sp. palmarum (FOP) is a fungal pathogen that causes fusarium wilt of palms, a lethal disease affecting queen palms and Mexican fan palms. FOP is morphologically indistinguishable from other members of the F. oxysporum species complex, complicating species-level identification.

Objective

The mitochondrial genome of FOP was sequenced and analyzed to explore its utility in designing a molecular diagnostics assay for this palm pathogen. This work aims to support molecular-based identification and monitoring tools for FOP.

Results

The FOP mitogenome consists of a 47.3 kb circular chromosome with 239× coverage and 32.3% GC content, containing 43 genes including 14 core protein-coding genes, 1 rRNA, 23 tRNAs, and 5 ORFs. Two introns encoding homing endonucleases were identified in the cob and nad5 genes.

Conclusion

The complete mitochondrial genome of FOP has been sequenced and deposited in GenBank, providing a resource for molecular diagnostics development. The mitogenome sequence can support improved identification and detection of this important palm pathogen.
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