Vol. 48 No. 3 (2009)
Research Papers

The effect in vitro of exogenously applied p-hydroxybenzoic acid on Fusarium oxysporum f. sp. Niveum

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  • H. Wu,
  • S. Shen,
  • J. Han,
  • Y. Liu,
  • S. Liu
H. Wu
Nanjing University of Information Science and Technology
S. Shen
Nanjing University of Information Science and Technology
Y. Liu
Yangzhou Professoinal Institute of Polytechnic
S. Liu
Nanjing University of Information Science and Technology
DOI: https://doi.org/10.14601/Phytopathol_Mediterr-2935

Published 2010-01-12

How to Cite

[1]
H. Wu, S. Shen, J. Han, Y. Liu, and S. Liu, “The effect in vitro of exogenously applied p-hydroxybenzoic acid on Fusarium oxysporum f. sp. Niveum”, Phytopathol. Mediterr., vol. 48, no. 3, pp. 439–446, Jan. 2010.

Copyright (c) 2010 H. Wu, S. Shen, J. Han, Y. Liu, S. Liu

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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Abstract

The allelochemical, p-hydroxybenzoic acid, was applied in vitro to Fusarium oxysporum f. sp. niveum, a pathogen causing watermelon wilt disease, by adding the acid to the medium. P-hydroxybenzoic acid slightly stimulated the growth of the fungus at low concentrations (200–800 mg L-1), but it strongly inhibited its growth at the highest concentration (1600 mg L-1). At this acid concentration the mycelial mass was reduced by 63.7% and the conidial germination rate was decreased by 46.9–100%. Sporulation was also suppressed, with a 91.4% reduction. However, fusaric acid production by Fusarium oxysporum f. sp. niveum was stimulated with an increase of 47.3–379.4%. The activity of proteinase, pectinase and cellulase was stimulated by p-hydroxybenzoic acid, but amylase activity was depressed.
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