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Microb Pathog. 2017 Sep;110:645-653. doi: 10.1016/j.micpath.2017.07.027. Epub 2017 Jul 18.

Isolation and characterization of metabolites from Bacillus licheniformis MH48 with antifungal activity against plant pathogens.

Author information

1
Division of Food Technology, Biotechnology and Agrochemistry, Institute of Environmentally-Friendly Agriculture, Chonnam National University, Gwangju 61186, South Korea.
2
Department of Food Engineering, Mokpo National University, 571 Mokpo, South Korea.
3
Division of Forest Resources, Chonnam National University, Gwangju 500-757, South Korea.
4
Department of Food Science and Technology and Functional Food Research Center, Chonnam National University, Gwangju, South Korea.
5
Department of Plant Resources & Environment, Cheju National University, Cheju 690-756, South Korea.
6
Department of Fire Safety, Gwangju University, Gwangju 503-703, South Korea.
7
Division of Food Technology, Biotechnology and Agrochemistry, Institute of Environmentally-Friendly Agriculture, Chonnam National University, Gwangju 61186, South Korea. Electronic address: kimkil@chonnam.ac.kr.

Abstract

In this study, we isolated Bacillus licheniformis MH48 from rhizosphere soil and demonstrated that this strain shows significant antifungal activity against Rhizoctonia solani, Colletotrichum gloeosporioides, and Phytophthora capsici. Our results showed that a 50% concentration of bacterial cell-free culture filtrate of B. licheniformis MH48 shows strong activity against fungal pathogens. Benzoic acid produced by B. licheniformis MH48 was purified by various chromatographic techniques and identified by nuclear magnetic resonance and gas chromatography-mass spectrometry analysis. Benzoic acid displayed antifungal activity against R. solani and C. gloeosporides with minimum inhibitory concentration of 128 μg/mL against mycelial growth. Microscopic examination revealed that benzoic acid (50 μg/mL and 100 μg/mL) transformed C. gloeosporioides conidial morphology and inhibited conidial germination. In addition, benzoic acid (100 μg/mL and 200 μg/mL) degraded R. solani mycelia. Therefore, our results demonstrate that B. licheniformis MH48 strain shows potential for utility as a biological agent for the control of various fungal pathogens of plants.

KEYWORDS:

Antifungal activity; Bacillus licheniformis MH48; Benzoic acid; Colletotrichum gloeosporioides; Phytopathogens

PMID:
28733027
DOI:
10.1016/j.micpath.2017.07.027
[Indexed for MEDLINE]

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