Comparative transcriptome analysis reveals the biocontrol mechanism of Bacillus velezensis E68 against Fusarium graminearum DAOMC 180378, the causal agent of Fusarium head blight

PLoS One. 2023 Jan 26;18(1):e0277983. doi: 10.1371/journal.pone.0277983. eCollection 2023.

Abstract

Fusarium graminearum is the causal agent of Fusarium Head Blight, a serious disease affecting grain crops worldwide. Biological control involves the use of microorganisms to combat plant pathogens such as F. graminearum. Strains of Bacillus velezensis are common biological control candidates for use against F. graminearum and other plant pathogens, as they can secrete antifungal secondary metabolites. Here we study the interaction between B. velezensis E68 and F. graminearum DAOMC 180378 by employing a dual RNA-seq approach to assess the transcriptional changes in both organisms. In dual culture, B. velezensis up-regulated genes related to sporulation and phosphate stress and down-regulated genes related to secondary metabolism, biofilm formation and the tricarboxylic acid cycle. F. graminearum up-regulated genes encoding for killer protein 4-like proteins and genes relating to heavy metal tolerance, and down-regulated genes relating to trichothecene biosynthesis and phenol metabolism. This study provides insight into the molecular mechanisms involved in the interaction between a biocontrol bacterium and a phytopathogenic fungus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacillus* / genetics
  • Fusarium* / genetics
  • Fusarium* / metabolism
  • Gene Expression Profiling
  • Plant Diseases / microbiology
  • Plant Diseases / prevention & control

Supplementary concepts

  • Fusarium graminearum
  • Bacillus velezensis

Grants and funding

This research was funded through an NSERC Discovery Grant (RGPIN-2016-04805) to SJ. Natural Sciences and Engineering Research Council of Canada: https://www.nserc-crsng.gc.ca/index_eng.asp. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.