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Antifungal Activity of Bacillus Subtilis HK2 against Trichothecium Roseum Causing Pink Rot of Melon and White Stain Symptom on Grape
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  • Journal title : Korean Journal of Plant Resources
  • Volume 29, Issue 1,  2016, pp.39-45
  • Publisher : The Plant Resources Society of Korea
  • DOI : 10.7732/kjpr.2016.29.1.039
 Title & Authors
Antifungal Activity of Bacillus Subtilis HK2 against Trichothecium Roseum Causing Pink Rot of Melon and White Stain Symptom on Grape
Oh, Soh-Young; Lee, En-Young; Nam, Ki-Woong; Yoon, Deok-Hoon;
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Pink Rot on melon and White Stain Symptom on grape are caused by Trichothecium roseum, one of the most important diseases of grape and melon. These diseases have been occurred in national-wide in Korea and causes irreversible damage on the grape and the melon at harvest season. This research presents the evaluation of the capacity of Bacillus subtillis HK2 to protect both melon and grape against T. reseum and establishes its role as a biocontrol agent. In this study, we isolated a Bacillus strain HK2 from rhizosphere soil, identified it as Bacillus subtillis by 16S rRNA analysis and demonstrated its antifungal activity against T. roseum. Under I-plate assay it was observed that the effect of hyphal growth inhibition was not due to production of volatile compounds. The optimum culture condition of HK2 was found at 30℃ and initial pH of 7.0. Application of HK2 culture suspension reduced 90.2% of white stain symptom on grape as compared to control, resulting in greater protection to grape against T. roseum infestation. Butanol extract of HK2 culture purified using flash column chromatography. The antifungal material was a polar substance as it showed antifungal activity in polar elute. Therefore, our results indicated a clear potential of B. subtilis HK2 to be used for biocontrol of Pink rot in melon and white stain symptom on grape caused by T. roseum.
Bacillus Subtilis;Grape;Melon;Pink rot;Trichothecium Roseum;White stain symptom;
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