Journal
MARINE DRUGS
Volume 17, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/md17040199
Keywords
lipopeptide; surfactin; Bacillus; antifungal; reactive oxygen species
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Funding
- National Key R&D Program of China [2018YFC0310800]
- China Ocean Mineral Resources RD Association [DY135-B2-14]
- Natural Science Outstanding Youth Fund of Shandong Province [JQ201607]
- Tai Shan Young Scholar Foundation of Shandong Province [tsqn20161051]
- AoShan Talents Program by Qingdao National Laboratory for Marine Science and Technology [2015ASTP]
- 100-Talent Project of the Chinese Academy of Sciences
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This study was initiated to screen for marine bacterial agents to biocontrol Magnaporthe grisea, a serious fungal pathogen of cereal crops. A bacterial strain, isolated from the cold seep in deep sea, exhibited strong growth inhibition against M. grisea, and the strain was identified and designated as Bacillus sp. CS30. The corresponding antifungal agents were purified by acidic precipitation, sequential methanol extraction, Sephadex LH-20 chromatography, and reversed phase high-performance liquid chromatography (RP-HPLC), and two antifungal peaks were obtained at the final purification step. After analysis by mass spectrometry (MS) and tandem MS, two purified antifungal agents were deduced to belong to the surfactin family, and designated as surfactin CS30-1 and surfactin CS30-2. Further investigation showed that although the antifungal activity of surfactin CS30-1 is higher than that of surfactin CS30-2, both of them induced the increased generation of reactive oxygen species (ROS) and caused serious damage to the cell wall and cytoplasm, thus leading to the cell death of M. grisea. Our results also show the differences of the antifungal activity and antifungal mechanism of the different surfactin homologs surfactin CS30-1 and surfactin CS30-2, and highlight them as potential promising agents to biocontrol plant diseases caused by M. grisea.
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