Rhizobacteria as Bioprotectants Against Stress Conditions

  • F. Pereira
Part of the Microorganisms for Sustainability book series (MICRO, volume 12)


The area around the plant which is under the influence of plant roots, known as the rhizosphere, is an attractive habitat for soil microorganisms. However, although a variety of root-colonizing bacteria exist, the beneficial bacteria also called plant growth-promoting bacteria (PGPR) or rhizobacteria essentially serve as bioprotectants against stress conditions. Environmental abiotic stresses such as drought, salinity, and metal contamination, as well as biotic stresses from opportunistic pathogens, present a major challenge as it reduces the potential yields of food production. Rhizobacteria are of immense interest because they compete with indigenous bacteria and increase plant resistance against stress conditions. These bacteria have a number of traits that contribute to root colonization such as the presence of specific cell surface components, pili, fimbriae, chemotaxis toward plant exudates, ability to use specific components of plant exudates, protein secretion property, ability to form biofilms, and quorum sensing. The production of biologically active metabolites and the regulation of ACC deaminase are some of the principal mechanisms by which rhizobacteria modify the rhizosphere environment thereby enhancing plant growth. This article seeks to give an overview of mechanisms in rhizobacteria proposed to enhance stress tolerance conditions.


Rhizobacteria Abiotic stress Stress tolerance Plant growth 



The author is grateful to the Principal of P.E.S’s RSN College for his support.


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© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • F. Pereira
    • 1
  1. 1.Department of MicrobiologyPES’s Ravi Sitaram Naik College of Arts and ScienceFarmagudi, PondaIndia

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