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- Title
An avirulence gene homologue in the tomato wilt fungus <i>Fusarium</i> <i>oxysporum</i> f. sp. <i>lycopersici</i> race 1 functions as a virulence gene in the cabbage yellows fungus <i>F.</i> <i>oxysporum</i> f. sp. <i>conglutinans</i>.
- Authors
Kashiwa, Takeshi; Inami, Keigo; Fujinaga, Masashi; Ogiso, Hideki; Yoshida, Takanobu; Teraoka, Tohru; Arie, Tsutomu
- Abstract
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.
- Subjects
FUSARIUM oxysporum; WILT diseases; CABBAGE yellows; MICROBIAL virulence; PLANT disease research
- Publication
Journal of General Plant Pathology, 2013, Vol 79, Issue 6, p412
- ISSN
1345-2630
- Publication type
Article
- DOI
10.1007/s10327-013-0471-5