Abstract
Fourteen wild type and three UV-irradiated isolates of Fusarium oxysporum f. sp. cucumerinum (Foc) were evaluated as to the level of resistance they could induce in tomato to late blight caused by Phytophthora infestans. Tomato plants were induced by applying a suspension of Foc microconidia directly to the surface of the potting media without disturbing the tomato roots. Upper leaves of tomato plants were inoculated with P. infestans, and a reduction in lesion expansion was used as an index of induced resistance. All fourteen wild type isolates of Foc significantly reduced expansion of late blight lesions. One of the wild type isolates produced a significantly weaker resistance response than the other isolates. None of the UV-irradiated isolates induced significant resistance. The same Foc isolates were compared as to their virulence and their pigment production in culture, and considerable variation among them was revealed for both characteristics. Positive correlations existed both between the level of induced resistance and virulence, and between the level of induced resistance and pigmentation. The gradual increment in the level of induced resistance and the exceptions to the correlations between induced resistance and the two characteristics investigated suggest that multiple factors contribute to the induction of resistance by Foc.
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Acknowledgments
The author is extremely grateful to F. Namiki, T. Ohguchi, H. Shiomi, and K. Watanabe for providing isolates of Fusarium oxysporum f. sp. cucumerinum. The author wholeheartedly thanks the journal reviewers and editors for their valuable comments and advice which resulted in a much improved manuscript.
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Nelson, H.E. Multiple factors control the level of resistance induced in tomato by Fusarium oxysporum f. sp. cucumerinum . BioControl 59, 625–633 (2014). https://doi.org/10.1007/s10526-014-9593-8
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DOI: https://doi.org/10.1007/s10526-014-9593-8