Abstract
The soil-borne, asexual fungus Fusarium oxysporum f.sp. lycopersici (Fol) is a causal agent of tomato wilt disease. The infection process of Fol comprises root recognition, adhesion, penetration, colonization of the root cortex and hyphal proliferation within the xylem vessels, which are under the regulation of virulence-involved transcription factors (TFs). In this study, we identified a gene, designated FolCZF1, which encodes a C2H2 TF in Fol. The homologs of FolCzf1 are also known to affect pathogenicity in F. graminearum and Magnaporthe oryzae on wheat and rice, respectively. We learned that FolCZF1 transcript level is upregulated in conidia and early host infection stage, which led us to hypothesize that FolCzf1 is associated with early host infection in Fol. The FolCZF1 deletion mutant (ΔFolCZF1) exhibited defects in growth rate, conidiation, conidia morphology and a complete loss of virulence on tomato root. Further microscopic observation showed that ΔFolCZF1 can penetrate the root but the primary infection hypha cannot extend its colonization inside the host tissue, suggesting that FolCzf1 TF plays an important role in early infection. Fusaric acid, a secondary metabolite produced by Fusarium species, is suggested as a virulence factor in many crop diseases. We found that FolCzf1 plays a critical role in fusaric acid production by regulating the expression of fusaric acid biosynthesis genes. In summary, FolCzf1 is required for conidiation, secondary metabolism, and early host infection in Fol, and we propose that homologs of FolCzf1 are required for early parasitic growth in other plant pathogenic filamentous fungi.
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Acknowledgements
This research was supported by the Natural Science Foundation of Fujian Province (2016J01113), Young Teacher Education Research Project of Fujian Province (JAT160178), Fujian Agriculture and Forestry University Outstanding Youth Scientific Research Project (xjq201625) and Natural Science Foundation of China (31601583).
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Fig. S1. Phylogenetic and conserved domain analyses of FolCzf1 orthologs. a The phylogenetic analysis is based on full-length amino-acid sequences using the neighbor-joining method by MEGA 5 software. The Bootstrap replicates were 1000. b The light grey square and the dark grey hexagon represent C2H2 zinc finger domain and coiled-coil motif, respectively.
Fig. S2. Amino acid sequence alignment of FolCzf1 and its homolog in F. verticillioides. Identical amino acids are highlighted with a shaded background. Conserved C2H2 zinc finger motifs are highlighted with red lines.
Fig. S3. Generation and identification of FolCZF1 gene deletion mutants. The knockout strategy for FolCZF1 gene in F. oxysporum genome is shown in left. The gene-specific probe (probe1) and hygromycin phosphotransferase (HPH) probe (probe2) used for Southern blot analysis of the gene-knockout mutants are depicted. Thick arrows indicate orientations of FolCZF1 and HPH genes. The restriction enzymes used for Southern blots are KpnI and NruI for probe1 and probe 2, respectively. When hybridized with probe1, a 2.5-kb band was observed in the wild-type strain but not in ΔFolCZF1 mutants. When hybridized with probe2, the ΔFolCZF1 mutants showed a 3.9-kb band characteristic of the gene-replacement event, but not in wild-type sample.
Fig. S4. Subcellular localization of FolCzf1 in F. oxysporum. FolCzf1 was localized to the nucleus in hypha, conidia and germinating conidia. 4,6-Diamidino-2-phenylindole (DAPI) was used to stain nucleus of the cell. The merged image of GFP and DAPI staining showed that FolCzf1-GFP localizes to the nucleus. DIC, differential interference contrast. Bar = 10 μm.
Fig. S5. The ΔGCF3 mutant is defective in virulence in rice and barley leaves. a The wild-type (WT) and two GCF3 deletion mutant (ΔGCF3-1 and ΔGCF3-2) strains were cultured on CM plates at 28 °C for 7 days. b Barley leaves (left) and rice leaves (right) were sprayed with fungal conidia.
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Yun, Y., Zhou, X., Yang, S. et al. Fusarium oxysporum f. sp. lycopersici C2H2 transcription factor FolCzf1 is required for conidiation, fusaric acid production, and early host infection. Curr Genet 65, 773–783 (2019). https://doi.org/10.1007/s00294-019-00931-9
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DOI: https://doi.org/10.1007/s00294-019-00931-9