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Biosynthesis of Antibiotics by PGPR and its Relation in Biocontrol of Plant Diseases

  • W. G. Dilantha Fernando
  • S. Nakkeeran
  • Yilan Zhang

Abstract

Plant growth promoting rhizobacteria (PGPR) play a vital role in crop protection, growth promotion and in the improvement of soil health. Some well known PGPR strains are Pseudomonas, Bacillus, Azospirillum, Rhizobium, and Serratia species. The primary mechanism of biocontrol by PGPR involves the production of antibiotics such as phenazine-1-carboxyclic acid, 2,4-diacetyl phloroglucinol, oomycin, pyoluteorin, pyrrolnitrin, kanosamine, zwittermycin-A, and pantocin. A cascade of endogenous signals such as sensor kinases, N-acyl homoserine lactones and sigma factors regulates the synthesis of antibiotics. The genes responsible for the synthesis of antibiotics are highly conserved. The antibiotics pertain to polyketides, heterocyclic nitrogenous compounds and lipopeptides have broad-spectrum action against several plant pathogens, affecting crop plants. In addition to direct antipathogenic action, they also serve as determinants in triggering induced systemic resistance (ISR) in the plant system. Though antibiotics play a vital role in disease management, their role in biocontrol is questioned due to constraints of antibiotic production under natural environmental conditions. Environmental and other factors that suppress the antimicrobial action of antibiotics have to be studied to exploit the potential of antibiotics of PGPR in crop protection.

Key words

antibiotics biocontrol PGPR 

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Copyright information

© Springer 2005

Authors and Affiliations

  • W. G. Dilantha Fernando
    • 1
  • S. Nakkeeran
    • 1
  • Yilan Zhang
    • 1
  1. 1.Department of Plant ScienceUniversity of ManitobaWinnipegCanada

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