Activation of pathogenesis-related genes by the rhizobacterium, bacillus sp. JS, which induces systemic resistance in tobacco plants

Ji Seong Kim, Jeongeun Lee, Chan Hui Lee, Su Young Woo, Hoduck Kang, Sang Gyu Seo, Sun Hyung Kim

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Plant growth promoting rhizobacteria (PGPR) are known to confer disease resistance to plants. Bacillus sp. JS demonstrated antifungal activities against five fungal pathogens in in vitro assays. To verify whether the volatiles of Bacillus sp. JS confer disease resistance, tobacco leaves pre-treated with the volatiles were damaged by the fungal pathogen, Rhizoctonia solani and oomycete Phytophthora nicotianae. Pre-treated tobacco leaves had smaller lesion than the control plant leaves. In pathogenesis-related (PR) gene expression analysis, volatiles of Bacillus sp. JS caused the up-regulation of PR-2 encoding β-1,3-glucanase and acidic PR-3 encoding chitinase. Expression of acidic PR-4 encoding chitinase and acidic PR-9 encoding peroxidase increased gradually after exposure of the volatiles to Bacillus sp. JS. Basic PR-14 encoding lipid transfer protein was also increased. However, PR-1 genes, as markers of salicylic acid (SA) induced resistance, were not expressed. These results suggested that the volatiles of Bacillus sp. JS confer disease resistance against fungal and oomycete pathogens through PR genes expression.

Original languageEnglish
Pages (from-to)195-201
Number of pages7
JournalPlant Pathology Journal
Volume31
Issue number2
DOIs
StatePublished - 2015

Keywords

  • Antifungal activities
  • Disease resistance
  • Plant growth promoting rhizobacteria

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