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Plant Growth-Promoting Rhizobacteria (PGPRs): Significant Revolutionary Tools for Achieving Long-Term Sustainability and Combating the Biotic Stress Caused by the Attack of Pathogens Affecting Crops in Agriculture

  • Abhishek Mathur
  • Akshma Koul
  • Juhi Hattewar
Chapter
Part of the Microorganisms for Sustainability book series (MICRO, volume 13)

Abstract

The microbes residing in the soil that are beneficial for the growth of crops in terms of vegetative and reproductive growth are known as plant growth-promoting microbes (PGPMs). These PGPMs may be agriculturally promising bacterial and fungal strains which reside in the rhizosphere region of crops. Today these PGPMs are of areas of interest for research and commercialization. These PGPMs are now broadly categorized as “plant growth-promoting rhizobacteria (PGPR).” These PGPRs play a vital role in maintaining soil fertility and plant health. They can act as biofertilizers and provide immunity to the crops against invasion of pathogens and resist against different biotic and abiotic stress conditions. PGPRs are effective growth modulators for the crop as they secrete novel metabolites and growth molecules that enable the crop to sustain in adverse and stress conditions. These molecules also induce systemic resistance and anti-pathogenic effect against the soil-borne infections. These PGPRs release different metabolites such as phyto-harmones, viz., indoleacetic acid (IAA), auxins, cytokinin and gibberellic acid (GA3) for growth of crops via solubilizing the minerals and other complex compounds. Besides these molecules, these PGPRs secrete allelochemicals and metabolites, including iron-chelating siderophores, antibiotics, biocides, volatile compounds, lytic compounds, and detoxification compounds which are able to kill the soil-borne pathogens. The PGPRs are also involved in biological control of insects and pests as these PGPRs are producing enzymes and metabolites which are able to invade the prey’s immune system and digest the internal organs followed by exoskeleton of insects and pests. Thus plant growth-promoting rhizobacteria are the promising candidates for agriculture in enhancing soil fertility and protecting the crops against soil-borne pathogens, insects, and pests. These PGPRs are therefore regarded as significant revolutionary tools for achieving long-term sustainability.

Keywords

Plant growth-promoting rhizobacteria (PGPR) Plant growth promotion activity Antagonistic activity Soil-borne pathogens Insecticidal and pesticidal activity 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Abhishek Mathur
    • 1
  • Akshma Koul
    • 1
  • Juhi Hattewar
    • 1
  1. 1.Research & DevelopmentNCS Green Earth Pvt. Ltd.NagpurIndia

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