Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Variation of Antifungal Activities of Chitosans on Plant Pathogens

  • Park, Ro-Dong (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Jo, Kyu-Jong (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Jo, You-young (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Jin, Yu-Lan (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Kim, Kil-Yong (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Shim, Jae-Han (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Kim, yong-Wong (Department of Agricultural Chemistry and Institute of Agricultural Science and Technology, Chonnam National University)
  • Published : 2002.02.01
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Abstract

The effect of chitosan on the growth of plant pathogenic fungi was investigated. Chitosan solubilized in acetic acid showed much higher and more consistent antifungal activity than that solubilized in HCl. The antifungal activity was not significantly affected within a DA (degree of deacetylation) range of $57.3-99.2\%$ tested. Water-soluble and low molecular weight chitosan ($57.3\%$ DA) against 6 plant pathogens showed that Monosporascus canonballus and Pythium irregulare were the most susceptible to the chitosan, while Fusarium oxysporum and F. graminearum were the most resistant. At a concentration of 2.5 mg/ml, the growth of pathogens was completely inhibited except for F. oxysporum. The $MIC_50$ values varied depending on both the DA of the chitosan and the plant pathogens. A chitosan with $57.3\%$ DA exhibited the lowest $MIC_50$ (ranging <0.1-1.8 mg/ml) and that with $84.7\%$ DA the highest $MIC_50$ (ranging <0.4-4.0 mg/ml) depending on the pathogen.

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References

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