African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5233


Plant growth promoting rhizobacteria and sustainable agriculture: A review

Muhammad Arslan Ashraf1,2, Muhammad Asif3, Ahmad Zaheer4, Arif Malik5, Qasim Ali2 and  Mahmood Rasool6*
1Lab No. 4026 Research wing, Department of Biology, University of Toronto Mississauga, Canada. 2Department of Botany, University of Agriculture, Faisalabad, Pakistan. 3Department of Biotechnology and Informatics, BUITEMS, Quetta, Pakistan. 4National Institute for Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan.  5Institute of Molecular Biology & Biotechnology (IMBB), The University of Lahore, Lahore, Pakistan. 6Center of Excellence in Genomic Medicine Research (CEGMR), King Abdulaziz University, Jeddah, Saudi Arabia
Email: [email protected]

  •  Accepted: 19 December 2012
  •  Published: 26 February 2013


Plant growth promoting rhizobacteria have gained extensive importance worldwide. These are naturally occurring bacteria that actively colonize the plant roots and improve plant growth. Plants inoculated with some potential PGPR strains exhibit improved biomass production. It has been observed that PGPR exert their growth promoting effects on plants by utilizing a number of mechanisms. Taken as an example, PGPR improve legumes growth due to their potential involvement in nitrogen fixation. Supply of nutrients like phosphorous, copper, iron, sulphur etc. is enhanced in the plants having rhizosphere enriched with plant growth promoting rhizobacteria. PGPR also act as bio-control agents by imposing their negative effects on the growth of disease causing bacteria, fungi and help in controlling insect pests. The research on PGPR has been on rise for the past few decades and several products containing PGPR have been commercialized for their use in agriculture. The more emphasis of scientists on these PGPR is due to the fact that these could only be the best alternative for the chemical products being utilized on a wide scale for getting improved yield. These chemical products are known to add to the pollutants prevailing in our environment. Therefore, the focus of this review is on the potential characteristics of PGPR that make them suitable alternative for chemical products being extensively exploited in agricultural practices.


Key words: PGPR, Nitrogen fixation, Bio-control agents