Unleashing Bacillus species as versatile antagonists: Harnessing the biocontrol potentials of the plant growth-promoting rhizobacteria to combat Macrophomina phaseolina infection in Gloriosa superba

Article


Dhanabalan, Shanmugapriya, Muthusamy, Karthikeyan, Iruthayasamy, Johnson, Kumaresan, Parthiban V., Ravikumar, Caroline, Kandasamy, Rajamani, Natesan, Senthil and Periyannan, Sambasivam. 2024. "Unleashing Bacillus species as versatile antagonists: Harnessing the biocontrol potentials of the plant growth-promoting rhizobacteria to combat Macrophomina phaseolina infection in Gloriosa superba." Microbiological Research. 283. https://doi.org/10.1016/j.micres.2024.127678
Article Title

Unleashing Bacillus species as versatile antagonists: Harnessing the biocontrol potentials of the plant growth-promoting rhizobacteria to combat Macrophomina phaseolina infection in Gloriosa superba

ERA Journal ID2495
Article CategoryArticle
AuthorsDhanabalan, Shanmugapriya, Muthusamy, Karthikeyan, Iruthayasamy, Johnson, Kumaresan, Parthiban V., Ravikumar, Caroline, Kandasamy, Rajamani, Natesan, Senthil and Periyannan, Sambasivam
Journal TitleMicrobiological Research
Journal Citation283
Article Number127678
Number of Pages20
Year2024
PublisherElsevier
Place of PublicationGermany
ISSN0232-4393
0944-5013
Digital Object Identifier (DOI)https://doi.org/10.1016/j.micres.2024.127678
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S094450132400079X
AbstractCharcoal rot caused by Macrophomina phaseolina is one of the most devastating diseases that cause severe yield loss in Gloriosa superba cultivation. Plant growth-promoting rhizobacteria (PGPR) are extensively harnessed as biocontrol agents due to their effectiveness in combating a wide array of plant pathogens through a multifaceted approach. The present study delved into the mechanisms underlying its ability to inhibit root rot pathogen and its capacity to promote plant growth in G. superba, commonly known as glory lily. PGPR isolated from the rhizosphere of glory lily were subjected to in vitro assessments using the dual plate technique. The isolated Bacillus subtilis BGS-10 and B. velezensis BGS-21 showed higher mycelial inhibition (61%) against M. phaseolina. These strains also promote plant growth by producing indole-3-acetic acid, siderophore, ammonia, amylase, cellulase, pectinase, xylanase, and lipase chemicals. Genome screening of BGS-10 and BGS-21 revealed the presence of antimicrobial peptide genes such as Iturin (ituD gene), surfactin (srfA and sfp genes) along with the mycolytic enzyme β-1,3-glucanase. Further, the presence of secondary metabolites in the bacterial secretome was identified through gas chromatography-mass spectrometry (GC/MS) analysis. Notably, pyrrolo[1,2-a] pyrazine-1,4-dione, hexahydro-3-(2-methylpropyl), 9 H-pyrido[3,4-b] indole and L-leucyl-D-leucine exhibited the highest docking score against enzymes responsible for pathogen growth and plant cell wall degradation. Under glasshouse conditions, tuber treatment and soil application of talc-based formulation of B. subtilis BGS-10 and B. velezensis BGS-21 suppress the root rot incidence with a minimal disease incidence of 27.78% over untreated control. Concurrently, there was a notable induction of defense-related enzymes, including peroxidase (PO), polyphenol oxidase (PPO), and phenylalanine ammonia-lyase (PAL), in glory lily. Therefore, it can be concluded that plant growth-promoting Bacillus strains play a significant role in fortifying the plant's defense mechanisms against the root rot pathogen.
KeywordsBacillus spp.; Macrophomina phaseolina ; Secondary metabolites ; Plant growth promoting traits ; Defense enzymes
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020300103. Agricultural molecular engineering of nucleic acids and proteins
Byline AffiliationsTamil Nadu Agricultural University, India
Centre for Crop Health
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