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Rice leaf associated Chryseobacterium species: An untapped antagonistic flavobacterium displays volatile mediated suppression of rice blast disease

Biological Control, ISSN: 1049-9644, Vol: 161, Page: 104703
2021
  • 21
    Citations
  • 0
    Usage
  • 47
    Captures
  • 0
    Mentions
  • 20
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    21
    • Citation Indexes
      21
  • Captures
    47
  • Social Media
    20
    • Shares, Likes & Comments
      20
      • Facebook
        20

Article Description

Rice phyllosphere-associated pigmented bacteria were characterized and identified as Chryseobacterium based on 16S rRNA gene sequencing and phenotypic fingerprinting by Biolog. Molecular phylogenetic analysis by maximum likelihood method clustered the leaf Chryseobacterium with plant or soil-associated Chryseobacterium taklimakanense ( Os Ep-PSA33); Chryseobacterium camaliae ( Os Enb-ALM-D20, Os Enb-ALM-D11); Chryseobacterium culicis ( Os Enb-ALM-C23, Os Ep-PPA23, Os Ep-PPA6, Os Enb-ALM-D3); and Chryseobacterium endophyticum ( Os Enb-ALM-A6, Os Enb-ALM-A22). Activity testing of Chryseobacterium isolates showed excellent antifungal activity with over 80.0 % mycelial growth inhibition of Magnaporthe oryzae. The Chryseobacterium endophyticum Os Enb-ALM-A6 and Os Enb-ALM-A22 showed over 90 % fungal growth inhibition by volatile compounds. Chemical analysis of volatiles emitted by Chryseobacterium indicated the abundance of 2-Ethyl-hexanol; 1-Hexadecene; 2-Hexyl-decanol; Heptanal; Furan-diol; and Octanal. Upon seed or seedling bacterization, Chryseobacterium endophyticum not only triggered altered growth pattern of rice but also suppressed blast disease (40.0 % reduction over mock). qPCR-based transcriptional analysis showed enhanced expression of defense associated Os CEBiP, Os CERK, Os PAD4, Os NPR1.3, and Os FMO1. The volatile mediated antifungal activity and host defense induction by Chryseobacterium can be a potential alternative to fungicide-based blast management.

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