Characterization of Lysobacter capsici strain NF87–2 and its biocontrol activities against phytopathogens
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Strain NF87–2 is an aerobic, non-motile and rod-shaped Gram-negative bacterium. It was isolated from the rhizosphere of green pepper. In the present study, sequence analyses of the 16S rRNA and copA genes revealed that strain NF87–2 belongs to the species Lysobacter capsici. Strain NF87–2 could produce chitinase, cellulase, protease and siderophore. The strain showed a broad spectrum of antifungal activities against phytopathogens, including Alternaria brassicae, Rhizoctonia solani, Sclerotinia sclerotiorum, Botrytis cinerea, Colletotrichum gloeosporioides and Fusarium oxysporum. The secondary metabolites secreted by strain NF87–2 could inhibit the growth of both bacteria and fungi, but the mixture of peptides and proteins extracts from a suspension of strain NF87–2 could only inhibit the mycelia growth of fungi. Our results also have shown that strain NF87–2 could control pepper damping off caused by R. solani effectively in a greenhouse setting. Our findings provide a new source for a biocontrol agent and shed light on the mechanism of the antagonistic activity of L. capsici.
KeywordsLysobacter capsici Biocontrol Copper Secondary metabolites Peptides
This study was funded by the National Key R&D Program of China (grants 2017YFD0200400) and the Science and Technology Project of Jiangsu Province (BE2018359). This research was also partially funded by Suzhou Science and Technology Projects (No. SNG2018095).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Research involving human participants and/or animals
This article does not contain any studies with human participants or animals performed by any of the authors.
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