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Characterization of Bacillus amyloliquefaciens DA12 Showing Potent Antifungal Activity against Mycotoxigenic Fusarium Species

  • Lee, Theresa ;
  • Park, Dami ;
  • Kim, Kihyun ;
  • Lim, Seong Mi ;
  • Yu, Nan Hee ;
  • Kim, Sosoo ;
  • Kim, Hwang-Yong ;
  • Jung, Kyu Seok ;
  • Jang, Ja Yeong ;
  • Park, Jong-Chul ;
  • Ham, Hyeonheui ;
  • Lee, Soohyung ;
  • Hong, Sung Kee ;
  • Kim, Jin-Cheol
  • Received : 2017.06.20
  • Accepted : 2017.09.11
  • Published : 2017.10.01

Abstract

In an attempt to develop a biological control agent against mycotoxigenic Fusarium species, we isolated Bacillus amyloliquefaciens strain DA12 from soil and explored its antimicrobial activities. DA12 was active against the growth of mycotoxigenic F. asiaticum, F. graminearum, F. proliferatum, and F. verticillioides both in vitro and in planta (maize). Further screening using dual culture extended the activity range of strain DA12 against other fungal pathogens including Botrytis cinerea, Colletotrichum coccodes, Endothia parasitica, Fusarium oxysporum, Raffaelea quercus-mongolicae, and Rhizoctonia solani. The butanol extract of the culture filtrate of B. amyloliquefaciens DA12 highly inhibited the germination of F. graminearum macroconidia with inhibition rate 83% at a concentration of $31.3{\mu}g/ml$ and 100% at a concentration of $250{\mu}g/ml$. The antifungal metabolite from the butanol extract was identified as iturin A by thin layer chromatography-bioautography. In addition, volatile organic compounds produced by DA12 were able to inhibit mycelial growth of various phytopathogenic fungi. The volatile compounds were identified as 2-heptanone, 5-methyl heptanone and 6-methyl heptanone by gas chromatography-mass spectrometry (GC-MS) analysis. These results indicate that the antagonistic activity of Bacillus amyloliquefaciens DA12 was attributable to iturin A and volatile heptanones, and the strain could be used as a biocontrol agent to reduce the development of Fusarium diseases and mycotoxin contamination of crops.

Keywords

antifungal activity;Bacillus amyloliquefaciens;iturin A;mycotoxin

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Cited by

  1. vol.68, pp.4, 2018, https://doi.org/10.1080/09064710.2017.1410565

Acknowledgement

Grant : Cooperative Research Program for Agricultural Science & Technology Development

Supported by : National Institute of Agricultural Sciences