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Prasanna S, Prasannakumar MK, Mahesh HB, Babu GV, Kirnaymayee P, Puneeth ME, Narayan KS, Pramesh D. Diversity and biopotential of Bacillus velezensis strains A6 and P42 against rice blast and bacterial blight of pomegranate. Arch Microbiol 2021; 203:4189-4199. [PMID: 34076737 DOI: 10.1007/s00203-021-02400-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 05/19/2021] [Accepted: 05/21/2021] [Indexed: 10/21/2022]
Abstract
Bacillus velezensis is widely known for its inherent biosynthetic potential to produce a wide range of bio-macromolecules and secondary metabolites, including polyketides (PKs) and siderophores, as well as ribosomally and non-ribosomally synthesized peptides. In the present study, we aimed to investigate the bio-macromolecules, such as proteins and peptides of Bacillus velezensis strains, namely A6 and P42 by whole-cell sequencing and highlighted the potential application in controlling phytopathogens. The bioactive compounds, specifically secondary metabolites, were characterized by whole-cell protein profiling, Thin-Layer Chromatography, Infra-Red Spectroscopy, Nuclear Magnetic Resonance, Gas Chromatograph and Electro Spray Liquid Chromatography. Gas Chromatography analysis revealed that the A6 and P42 strains exert different functional groups of compounds, such as aromatic ring, aliphatic, alkene, ketone, amine groups and carboxylic acid. Whole-cell protein profiling of A6 and P42 strains of B. velezensis by nano-ESI LC-MS/MS revealed the presence of 945 and 5303 proteins, respectively. The in vitro evaluation of crude extracts (10%) of A6 and P42 significantly inhibited the rice pathogen, Magnaporthe oryzae (MG01), whereas the cell-free culture filtrate (75%) of strain P42 showed 58.97% inhibition. Similarly, in vitro evaluation of crude extract (10%) of P42 strain inhibited bacterial blight of pomegranate pathogen, Xanthomonas axonopodis pv. punicae, which eventually resulted in a higher inhibition zone of 3 cm, whereas the cell-free extract (75%) of the same strain significantly suppressed the growth of the pathogen with an inhibition zone of 1.48 cm. From the results obtained, the crude secondary metabolites and cell-free filtrates (containing bio-macromolecules) of the strains A6 and P42 of B. velezensis can be employed for controlling the bacterial and fungal pathogens of crop plants.
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Affiliation(s)
- Siddulakshmi Prasanna
- Department of Plant Pathology, University of Agricultural Sciences, GKVK, Bengaluru, 560065, India
| | - M K Prasannakumar
- Department of Plant Pathology, University of Agricultural Sciences, GKVK, Bengaluru, 560065, India.
| | - H B Mahesh
- Department of Plant Pathology, University of Agricultural Sciences, GKVK, Bengaluru, 560065, India
| | - Gopal Venkatesh Babu
- Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai, 600025, India
| | - P Kirnaymayee
- Department of Cell Biology and Molecular Genetics, Sri Devaraj URS Academy of Higher Education and Research, Kolar, Karnataka, India
| | - M E Puneeth
- Department of Plant Pathology, University of Agricultural Sciences, GKVK, Bengaluru, 560065, India
| | - Karthik S Narayan
- Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai, 600025, India
| | - D Pramesh
- Agricultural Research Station, Gangavati, University of Agricultural Sciences, Raichur, Karnataka, India
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