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Perspectives of Plant Growth-Promoting Rhizobacteria in Conferring Salinity Tolerance in Crops

  • Uttara Oak
  • Amrita Srivastav
  • Vinay Kumar
Chapter

Abstract

Soil salinity is imposing serious threats for crop production particularly in arid and semi-arid regions. Various causes for increasing soil salinity in agricultural lands around the globe include weathering of rocks, excessive irrigation, deforestation and poor drainage. Scraping, flushing and leaching are physical means by which soil salinity can be managed, but to a limited extent. Salt-tolerant crop plant varieties are developed by plant biotechnologists to overcome the salinity issues. Bacteria that exist in the rhizoplane and rhizosphere and that are endophytic have shown positive effects on the crop with respect to nutrient availability and therefore are of great importance. The current chapter encompasses the adverse effects of salinity on crop plants and direct and indirect effects of plant growth-promoting rhizobacteria (PGPR) in amelioration of salinity stress and the mechanisms involved thereby. Nitrogen fixation, phosphate solubilisation, phytohormones and the siderophores produced by PGPRs directly make the nutrients available to the plants and allow the crops to grow vigorously. The indirect mechanisms involve production of lytic enzymes, antibiotics that inhibit the pathogen. PGPRs produce osmotolerant chemicals, reactive oxygen species scavenging enzymes and the enzymes that reduce the oxidative stress on the plant system and thereby induce systemic resistance to saline conditions in the plants. In conclusion, the PGPRs can be used as alternate strategy for not just flourishing of the crop plants but also allowing them to withstand a stress condition and thus can be used so that the barren saline lands can be brought under cultivation.

Keywords

Soil salinity NaCl Plant growth-promoting rhizobacteria (PGPR) Phytohormones Siderophores 

Abbreviations

ACC)-deaminase

1-aminocyclopropane-1-carboxylate deaminase

ePGPR

Exo-PGPR

EPS

Exopolysaccharides

IAA

Indole-3-acetic acid

IAM

Indole-3-acetamide

iPGPR

Internal PGPR

IPyA

Indole-3-pyruvic acid

PGPB

Plant growth-promoting bacteria

PGPR

Plant growth-promoting rhizobacteria

PSB

Phosphate-solubilising bacteria

ROS

Reactive oxygen species

VOC

Volatile organic compounds

Notes

Acknowledgements

Authors acknowledge the financial support under FIST program of Department of Science and Technology (DST), Government of India, and Star College Scheme of Department of Biotechnology (DBT), Government of India.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Uttara Oak
    • 1
  • Amrita Srivastav
    • 1
  • Vinay Kumar
    • 1
  1. 1.Department of Biotechnology, Modern College of Arts, Science and CommerceSavitribai Phule Pune UniversityPuneIndia

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