Six4, a small protein secreted by Fusarium oxysporum f. sp. lycopersici (Fol) in tomato xylem sap during infection, triggers Fol race 1-specific resistance (I) in tomato. SIX4 is regarded as an avirulence gene. Although SIX4 is considered unique to Fol race 1, we detected this gene in the cabbage yellows fungus F. oxysporum f. sp. conglutinans (Foc) by PCR. Because the genes from Foc and SIX4 in Fol were >99 % identical at the nucleotide level, the Foc gene was designated FocSIX4. The expression of FocSIX4 was detected by RT-PCR in stems and roots of cabbage 8 days after infection with Foc. In contrast with Fol, disruption of FocSIX4 in Foc did not increase virulence to Foc-resistant cabbage cvs. Shutoku-SP and Koikaze. On the contrary, the disruptants had reduced virulence not only on Foc-resistant cultivars but also on Foc-susceptible cv. Shikidori. These results suggested that FocSIX4 is involved in virulence, but not in avirulence, in the cabbage yellows fungus.
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We are grateful to Dr. T. Tsuge (Nagoya University) for providing pII99. The authors express their gratitude to Dr. K. L. Perry (Cornell University) for reviewing the manuscript. We thank Dr. M. Shimosaka (Shinsyu University) for providing fungal isolates. This study was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science to TA.
T. Kashiwa is a Research Fellow of Japan Society for the Promotion of Science.
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Supplementary Figure S1 Detection of SIX4 by PCR with the primer set SIX4F/SIX4R from representative isolates of Fusarium oxysporum. 1, f. sp. conglutinans Cong:1-1; 2, f. sp. conglutinans MAFF 240329; 3, f. sp. conglutinans 07 GB-N1; 4, f. sp. lycopersici race 1 MAFF 305121; 5, f. sp. lycopersici race 2 JCM 12575; 6, f. sp. lycopersici race 3 Chz1-A; 7, f. sp. raphani MAFF 240328; 8, f. sp. rapae Ta-2; 9, f. sp. apii SUF 1017; 10, f. sp. batatas MAFF 103070; 11, f. sp. melonis NRRL 26406; 12, f. sp. radicis-lycopersici MAFF 103044; 13, f. sp. melongenae MAFF 103051; 14, f. sp. matthioli 880116a; 15, f. sp. niveum MAFF 305608; 16, nonpathogenic isolate from cabbage, 07C-A2; 17, nonpathogenic isolate from cabbage, 08C-3B. IGS (rDNA-IGS region) was amplified using a primer set FIGS11/FIGS12 (Table 2) as a control.
Supplementary Figure S2 Detection of SIX4 by genomic Southern hybridization from representative isolates of Fusarium oxysporum. Genomic DNA was digested with HindIII, separated in 0.8 % agarose gel and hybridized with a probe (734 bp) recognizing FocSIX4 (Fig. 1). 1, f. sp. conglutinans Cong:1-1; 2, f. sp. apii SUF 1017; 3, f. sp. batatas MAFF 103070; 4, f. sp. cucumerinum Rif-1; 5, f. sp. lycopersici race 1 MAFF 305121; 6, f. sp. lycopersici race 2 JCM 12575; 7, f. sp. lycopersici race 3 Chz1-A; 8, f. sp. matthioli 880116a; 9, f. sp. radicis-lycopersici MAFF 103044; 10, f. sp. rapae Ta-2; 11, a nonpathogenic isolate from cabbage, 07C-A2.
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Kashiwa, T., Inami, K., Fujinaga, M. et al. An avirulence gene homologue in the tomato wilt fungus Fusarium oxysporum f. sp. lycopersici race 1 functions as a virulence gene in the cabbage yellows fungus F. oxysporum f. sp. conglutinans . J Gen Plant Pathol 79, 412–421 (2013). https://doi.org/10.1007/s10327-013-0471-5
- Fusarium oxysporum
- Virulence gene
- YR (yellows resistance)