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KMID : 0545120160260081383
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Journal of Microbiology and Biotechnology
2016 Volume.26 No. 8 p.1383 ~ p.1391
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Nematicidal Activity of Kojic Acid Produced by Aspergillus oryzae against Meloidogyne incognita
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Kim Tae-Yoon
Jang Ja-Yeong
Jeon Sun-Jeong
Lee Hye-Won
Bae Chang-Hwan
Yeo Joo-Hong
Lee Hyang-Burm
Kim In-Seon
Park Hae-Woong
Kim Jin-Cheol
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Abstract
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The fungal strain EML-DML3PNa1 isolated from leaf of white dogwood (Cornus alba L.) showed strong nematicidal activity with juvenile mortality of 87.6% at a concentration of 20% fermentation broth filtrate at 3 days after treatment. The active fungal strain was identified as Aspergillus oryzae, which belongs to section Flavi, based on the morphological characteristics and sequence analysis of the ITS rDNA, calmodulin (CaM), and β-tubulin (BenA) genes. The strain reduced the pH value to 5.62 after 7 days of incubation. Organic acid analysis revealed the presence of citric acid (515.0 mg/kg), malic acid (506.6 mg/kg), and fumaric acid (21.7 mg/kg). The three organic acids showed moderate nematicidal activities, but the mixture of citric acid, malic acid, and fumaric acid did not exhibit the full nematicidal activity of the culture filtrate of EML- DML3PNa1. Bioassay-guided fractionation coupled with 1H- and 13C-NMR and EI-MS analyses led to identification of kojic acid as the major nematicidal metabolite. Kojic acid exhibited dose-dependent mortality and inhibited the hatchability of M. incognita, showing EC50 values of 195.2 μg/ml and 238.3 μg/ml, respectively, at 72 h postexposure. These results suggest that A. oryzae EML-DML3PNa1 and kojic acid have potential as a biological control agent against M. incognita.
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KEYWORD
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Meloidogyne incognita, nematicidal activity, kojic acid, Aspergillus oryzae
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